Tensile and J-R curve characterization of thermally aged cast stainless steels by A. L. Hiser

Cover of: Tensile and J-R curve characterization of thermally aged cast stainless steels | A. L. Hiser

Published by Division of Engineering, Office of Nuclear Regulatory Research, U.S. Nuclear Regulatory Commission in Washington, DC .

Written in English

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Subjects:

  • Steel, Stainless -- Thermal fatigue.

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Distributed to depository libraries in microfiche.

Book details

Statementprepared by A.L. Hiser.
ContributionsU.S. Nuclear Regulatory Commission. Office of Nuclear Regulatory Research. Division of Engineering.
The Physical Object
Pagination1 v.
ID Numbers
Open LibraryOL15391707M

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Get this from a library. Tensile and J-R curve characterization of thermally aged cast stainless steels. [A L Hiser; U.S. Nuclear Regulatory Commission.

Office. Get this from a library. Tensile-property characterization of thermally aged cast stainless steels. [U.S. Nuclear Regulatory Commission. Office of Nuclear Regulatory Research. Division of Engineering.; Argonne National Laboratory.;].

To understand thermal aging embrittlement, fracture toughness J-R curve tests were performed on unaged and aged CF8 specimens at ℃. The microstructure of CF8 was also examined before and after thermal aging with transmission electron microscopy and atom probe : Y.

Chen, C. Xu, X. Zhang, W.-Y. Chen, J.-S. Park, J. Almer, M. Li, Z. Li, Y. Yang, A. Rao, B. Ale. Kawaguchi proposed a prediction method of tensile properties and fracture toughness of thermally-aged cast duplex stainless steel piping, and Tucker worked on the Tensile and J-R curve characterization of thermally aged cast stainless steels book of thermal embrittlement in duplex stainless steels UNS and for nuclear power : Sébastien Saillet, Patrick Le Delliou.

@article{osti_, title = {Thermal aging of cast stainless steels in LWR systems: Estimation of mechanical properties}, author = {Chopra, O K}, abstractNote = {A procedure and correlations are presented for predicting Charpy-impact energy, tensile flow stress, fracture toughness J-R curve, and J{sub IC} of aged cast stainless steels from known material information.

Metallurgical characterization and mechanical property data from Charpy-impact, tensile, and J-R curve tests are presented for several experimental and commercial heats, as well as for reactor-aged. The mechanical properties of cast stainless steels from the Shippingport reactor have been characterized.

Baseline properties for unaged materials were obtained from tests on either recovery-annealed material or material from a cooler region of the component. The materials exhibited modest decrease in impact energy and fracture toughness and a small increase in tensile strength.

Toughness of Cast Stainless Steels during Thermal Aging in LWR Systems. Office of Nuclear Regulatory Research. NUREG/CR J-R curve, tensile stress, and Charpy-impact energy of aged CASS materials are estimated Fracture toughness J-R curve data for thermally aged.

1. Introduction. Cast austenitic stainless steels (CASS) are used extensively in light water reactors (LWRs). The CF grade CASS alloys have compositions similar to those of series austenitic stainless steels (SSs), and are most often used for reactor components with complex shapes, such as pump casings, valve bodies, piping, and elbows in cooling systems, and control rod guide.

Due to thermal aging of long term operation, the cast stainless steels (CSSs) which are used for the primary piping of PWR, suffer a significant loss of fracture toughness, and as a consequence the safety margin of the thermal aged pipe decreases. Therefore, the aged piping should be analyzed and validated by the LBB concept.

The first deliverable of FY11 reported the tensile testing results of thermally-aged G92 in the normalized and tempered condition (H1 G92), G92 in the cold-rolled condition (H2 G92), and reference alloy, G91 ferritic-martensitic steels. This report summarizes the tensile data of thermallyaged HT -UPS austenitic stainless.

Cast stainless steel (CSS) is thermally aged by a long term exposure in the range of nuclear power plant operating temperature.

The thermal aging is a cause of concern for the continued safe and. Cast duplex stainless steel, grade ''CF3'', used in nuclear pump applications, was thermally aged to induce an embrittling phase transformation. The mechanical properties of as-cast material and materials thermally aged to simulate long term exposure at /sup 0/C (/sup 0/F) were investigated.

1. Introduction. Cast stainless steels are often used in the primary system piping of nuclear power plants. However, it is known that when cast stainless steels are exposed to high temperatures for a long time, thermal aging can occur due to spinodal decomposition of δ–ferrite.As results, ductility and fracture toughness can decrease while the yield strength can increase.

work on the short-time tensile properties of Typeand in Figure 3, which shows typical short-time tensile strengths of various stainless steels, the advantage of using Type in the quenched-and- tempered condition can be seen.

(Short-time tensile data on eight AISI-numbered stainless steels frequently used for high-temperature service are. The cast austenite stainless steels were investigate in order to understand the microstructural evolution and mechanical properties in the long-term thermal aging at °C for up to 20, h.

Spinodal decomposition and G-phase precipitation in ferrite after long-term thermal aging lead to the degradation of mechanical properties. However, the effect of the low-fluence neutron irradiation on variation is neither significant nor apparent for the thermally aged steels.

Moreover, the fatigue behavior of various duplex stainless steels was studied [13,14,15,16]. The role of grain and phase boundaries has been shown to be critical not only in the fatigue crack initiation but. Tensile tests are used to determine the modulus of elasticity, elastic limit, elongation, proportional limit, reduction in area, tensile strength, yield point, yield strength and other tensile properties.

The main product of a tensile test is a load versus elongation curve which is then converted into a stress versus strain curve. A common 'predicted lower-bound' J-R curve for cast stainless steels of unknown chemical composition is also defined for a given grade of steel, range of ferrite content, and temperature.

This study conducted standard tensile and SP tests using thermally aged CF8M, which is a type of cast stainless steel, as well as unaged CF8M at ambient temperature. CF8M was thermally aged at   Therefore, the mechanical properties have been investigated using tensile test specimens and fracture toughness specimens aged at to °C for up to 40, hours.

From the results, the effects of thermal aging on the mechanical properties of these cast duplex stainless steels. The fracture toughness J-R curve, tensile stress, and Charpy-impact energy of aged cast stainless steels are estimated from known material information.

Mechanical properties of a specific more» cast stainless steel are estimated from the extent and kinetics of thermal embrittlement. The fracture toughness J-R curve for the aged material is then obtained by correlating RT Charpy-impact energy with fracture toughness parameters.

A common “predicted lower-bound” J-R curve for CASS materials of unknown chemical composition is also defined for a given grade of material, range of ferrite content, and temperature. Nowadays, high strength steels are getting very popular all over the world for various applications such as in auto body making, machine parts manufacturing, steel structure buildings, concrete reinforcement, etc.

In Bangladesh, use of high strength TMT steels bars has got a momentum in the construction of flyovers, bridges and high rise buildings because of its good combination of the.

Magnetic Response of Stainless Steels Pipe Dimensions “AtlasCR12” & “AtlasCR12Ti” – the 12% Chromium Ferritic Stainless Steels Aluminium Alloys and – Quite Similar but Completely Different Atlas Grade Datasheets Concise datasheets, covering all the common stainless steels, include chemical composition.

Three austenitic stainless steel welds (ASSW), such as E, ERL and ER, with about 10% of δ-ferrite were thermally aged at °C up to h to accelerate the thermal ageing expected. Thermal aging has minimal effect and the welding process has a significant effect on the tensile strength.

However, the existing data are inadequate to accurately establish the effect of the welding process on fracture properties of SS welds. Mechanical Properties of Thermally Aged Cast Stainless Steels From Shippingport Reactor Components.

steels than would be possible if the model were limited to literature reports that included full stress-strain behavior. Retained Yield Strength A common method to represent the high-temperature strength of steel is to plot the retained yield or tensile strength as a function of temperature, normalized to the room-temperature value [1,2,9.

Charpy-impact and J-R curve data are presented for several experimental and commercial heats, as well as for reactor-aged material of CF-3, CF-8, and CF-8M grades of cast stainless steel.

The effects of material variables on the embrittlement of cast stainless steels are evaluated. In general, the low carbon CF-3 grades of cast stainless steels are the most resistance and molybdenum-containing high-carbon. Cast Iron Our group tested: Cold Rolled Annealed Steel The measurements that were taken: 1)Tensile Test a)Time b)Position c)Force d)Change in length 2)Rockwell Hardness 3)Brinell Hardness 4)Pre­Tensile Test measurements a)Gage Width b)Gage Thickness c)Gage Length 5)Post­Tensile Data.

Tensile and J-R curve characterization of thermally aged cast stainless steels [microform] / prepared by A chart of magnetic curves of equal variation [cartographic material] / by Peter Barlow, Esqre; Interim fatigue design curves for carbon, low-alloy, and austenitic stainless steels.

- the aged cast duplex stainless steel pipe, - the L butt-weld, - the aged cast pipe HAZ, - the carbon steel extension pipes. Tensile tests were made on 6 mm diameter round tensile specimens. Fig. 4 shows the true stress-true strain curves obtained on the cast duplex stainless pipe, the L butt-weld, and the carbon steel pipes.

UNSW Sydney NSW Australia Tel: (+61 02) CRICOS Provider Code G | ABN 57 Last update on Wed, 11/12/ Authorised by the Head, School of. Elevated temperature modulii of elasticity and coefficients of expansion for stainless steels specified in BS EN The table below is based on the reference data presented in BS EN Only a sample of the information is shown for the most commonly used stainless steel types.

As a powerful tool for material characterization, neutron diffraction is an ideal approach for the residual stress research of crystalline materials [4,5].As for the multi-phase materials, Albertini et al.

have revealed high tensile stress in the γ phase and high compressive stress in the α phase in a centrifugal bowl of duplex steel [].Harjo et al.

have discussed the thermal residual. to thermal embrittlement after extended service at reactor operating temperatures, i.e., °C (°F). Aging of cast stainless steels at these temperatures leads to increased hardness and tensile strength and decreased ductility, impact strength, and fracture toughness.

Most studies of thermal embrittlement of cast stainless steels. 8: Tensile Curves for Different Materials When selecting a material for an engineering purpose it is essential to understand how the material will behave under stress. Stress-strain curves for different materials show that there is an extremely diverse range of behaviour patterns available.

material to failure and is given by the total area under the σ - ε curve such that U t = σ d ε ≈ (σ o + S u) 2 0 ε f ∫ ε f () where Su is the ultimate tensile strength, σ o is the proportional limit stress and ε f is the strain at fracture.

Ut is important in selecting materials for applications where high. The cast austenitic stainless steel (CASS) is used for the primary loop pipes of some PWR plants. It is known that these stainless steels are susceptible to thermal aging during plant operation.

This material degradation decreases the fracture toughness (J-R curve) and increases the tensile strength, which affects the possibility of the fracture of the pipes.

1 ENGINEERING HANDBOOK STEELMAKING Basic descriptions of making carbon, alloy, stainless, and tool steel p. METALS & ALLOYS Carbon grades, types, and numbering systems; glossary p.

CHEMICAL CONTENT Identification factors and composition standards p. HEAT TREATMENT Quenching, hardening, and other thermal modifications p. TESTING THE HARDNESS OF. For both austenitic and duplex stainless steels, the ratio of ultimate strength to yield strength is greater than for carbon steels.

BS EN [6] tabulates nominal (characteristic) values of yield strength f y and ultimate minimum tensile strength f u for steels to BS EN [7] for use in design.material.

Stainless steels, although more costly than carbon steel, provide far superior corrosion resistance and have higher temperature operating limits. Carbon Steel Oil Tempered SAE high carbon tempered spring steel is a standard material for spiral retaining rings and wave springs.

Tensile strength and yield strength are.changes in mechanical properties of aged austenitic stainless steels. According to JMatPro software calculation based on cast parts, these phases cannot be formed at low temperatures, such as ºC until years of temperature exposure as shown in figure 6.

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