Effect of aging on fracture behaviour of cast stainless steel and weldments

Hale, G. E.; Garwood, S.J.

doi:10.1179/mst.1990.6.3.230

Cited by 11 publications

(10 citation statements)

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“…Mechanical-property data on Charpy-impact, tensile, and fracture toughness properties of SMAWs, SAWs, and gas tungsten arc welds (GTAWs) prepared from Types 308 or 316 filler metal are compiled in Table 3. [21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38] The Charpy-impact data for unaged and aged welds are shown in Fig. 7.…”

Section: Charpy-impact Energymentioning

confidence: 99%

“…The existing fracture toughness J-R curve data from the work conducted for the U.S. Nuclear Regulatory Commission and compiled in the Pipe Fracture (PIFRAC) Database * and from other sources, 29,30,[32][33][34]37 are shown in Fig. 15.…”

Section: Figure 14 Fracture Toughness J-r Curve For Pwer Weld At 290°cmentioning

confidence: 99%

“…3 and 4, respectively, are compared in Fig. 18 with the data for aged 316L and CF-3 welds 24,32 and the data in the technical basis document for ASME Section XI Article IWB-3640. 26 Note that the data from Ref.…”

Section: Figure 14 Fracture Toughness J-r Curve For Pwer Weld At 290°cmentioning

confidence: 99%

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Effects of thermal aging on fracture toughness and charpy-impact strength of stainless steel pipe welds.

Gavenda¹,

Michaud²,

Galvin³

et al. 1996

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The degradation of fracture toughness, tensile, and Charpy-impact properties of Type 308 stainless steel (SS) pipe welds due to thermal aging has been characterized at room temperature and 290°C. Thermal aging of SS welds results in moderate decreases in Charpy-impact strength and fracture toughness. For the various welds in this study, upper-shelf energy decreased by 50-80 J/cm 2 . The decrease in fracture toughness J-R curve or J IC is relatively small. Thermal aging had little or no effect on the tensile strength of the welds. Fracture properties of SS welds are controlled by the distribution and morphology of second-phase particles. Failure occurs by the formation and growth of microvoids near hard inclusions; such processes are relatively insensitive to thermal aging. The ferrite phase has little or no effect on the fracture properties of the welds. Differences in fracture resistance of the welds arise from differences in the density and size of inclusions. Mechanical-property data from the present study are consistent with results from other investigations. The existing data have been used to establish minimum expected fracture properties for SS welds.

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Section: Charpy-impact Energymentioning

confidence: 99%

Section: Figure 14 Fracture Toughness J-r Curve For Pwer Weld At 290°cmentioning

confidence: 99%

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Effects of thermal aging on fracture toughness and charpy-impact strength of stainless steel pipe welds.

Gavenda¹,

Michaud²,

Galvin³

et al. 1996

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“…Investigations at Argonne National Laboratory (ANL) [1][2][3][4][5][6][7][8] and elsewhere [9][10][11][12][13][14][15][16] have shown that thermal embrittlement of cast SSs (i.e., ASTM Specification A-351 grades * CF-3, CF-3A, CF-8, CF-8A, and CF-8M) can occur during the reactor design life of 40 y. Cast SS components with even modest ferrite content, e.g., 10-15% ferrite, may show significant thermal embrittlement.…”

Section: Introductionmentioning

confidence: 99%

Mechanical properties of thermally aged cast stainless steels from shippingport reactor components.

Chopra¹,

Shack²,

Technology³

1995

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Thermal embrittlement of static-cast CF-8 stainless steel components from the decommissioned Shippingport reactor has been characterized. Cast stainless steel materials were obtained from four cold-leg check valves, three hot-leg main shutoff valves, and two pump volutes. The actual time-at-temperature for the materials was ≈13 y at ≈281°C (538°F) for the hot-leg components and ≈264°C (507°F) for the cold-leg components. Baseline mechanical properties for as-cast material were determined from tests on either recovery-annealed material, i.e., annealed for 1 h at 550°C and then water quenched, or material from the cooler region of the component. The Shippingport materials show modest decreases in fracture toughness and Charpy-impact properties and a small increase in tensile strength because of relatively low service temperatures and ferrite content of the steel. The procedure and correlations developed at Argonne National Laboratory for estimating mechanical properties of cast stainless steels predict accurate or slightly lower values for Charpy-impact energy, tensile flow stress, fracture toughness J-R curve, and J IC of the materials. The kinetics of thermal embrittlement and degree of embrittlement at saturation, i.e., the minimum impact energy achieved after long-term aging, were established from materials that were aged further in the laboratory. The results were consistent with the estimates. The correlations successfully predicted the mechanical properties of the Ringhals 2 reactor hot-and crossover-leg elbows (CF-8M steel) after service of ≈15 y and the KRB reactor pump cover plate (CF-8) after ≈8 y of service.

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“…Thermal aging of cast stainless steels (i.e., ASTM Specification A-351 for Grades * CF-3, CF-3A, CF-8, CF-8A, and CF-8M) at these temperatures causes an increase in hardness and tensile strength and a decrease in ductility, impact strength, and fracture toughness of the material and the Charpy transition curve shifts to higher temperatures. Investigations at Argonne National Laboratory (ANL) [1][2][3][4][5][6][7][8][9][10][11][12][13][14] and elsewhere [15][16][17][18][19][20][21][22] have shown that thermal embrittlement of cast stainless steel components occurs during the reactor design lifetime of 40 yr. Various grades and heats of cast stainless steel exhibit varying degrees of thermal embrittlement.…”

Section: Introductionmentioning

confidence: 99%

Estimation of fracture toughness of cast stainless steels during thermal aging in LWR systems - Revison 1.

Chopra¹

1994

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This report presents a revision of the procedure and correlations presented earlier in NUREG/CR-4513, ANL-90/42 (June 1991) for predicting the change in mechanical properties of cast stainless steel components due to thermal aging during service in light water reactors at 280-330°C (535-625°F). The correlations presented in this report are based on an expanded data base and have been optimized with mechanical-property data on cast stainless steels aged up to ≈58,000 h at 290-350°C (554-633°F). The correlations for estimating the change in tensile stress, including the Ramberg/Osgood parameters for strain hardening, are also described. 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 cast stainless steel are estimated from the extent and kinetics of thermal embrittlement. Embrittlement of cast stainless steels is characterized in terms of room-temperature Charpy-impact energy. The extent or degree of thermal embrittlement at "saturation," i.e., the minimum impact energy that can be achieved for a material after long-term aging, is determined from the chemical composition of the steel. Charpy-impact energy as a function of time and temperature of reactor service is estimated from the kinetics of thermal embrittlement, which are also determined from the chemical composition. The initial impact energy of the unaged steel is required for these estimations. Initial tensile flow stress is needed for estimating the flow stress of the aged material. The fracture toughness J-R curve for the material is then obtained by correlating room-temperature Charpy-impact energy with fracture toughness parameters. The values of J IC are determined from the estimated J-R curve and flow stress. 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. Examples of estimating mechanical properties of cast stainless steel components during reactor service are presented.

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Effect of aging on fracture behaviour of cast stainless steel and weldments

Cited by 11 publications

References 0 publications

Effects of thermal aging on fracture toughness and charpy-impact strength of stainless steel pipe welds.

Effects of thermal aging on fracture toughness and charpy-impact strength of stainless steel pipe welds.

Mechanical properties of thermally aged cast stainless steels from shippingport reactor components.

Estimation of fracture toughness of cast stainless steels during thermal aging in LWR systems - Revison 1.

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