奥氏体不锈钢和镍基合金在550 ℃/25 MPa超临界水中的应力腐蚀开裂敏感性
Stress Corrosion Cracking Susceptibility of Austenitic Stainless Steels and Nickel-based Alloy in Supercritical Water at 550 ℃/25 MPa
摘 要
研究了奥氏体不锈钢316Ti、HR3C、TP347和镍基合金718在550 ℃/25 MPa超临界水中的应力腐蚀开裂(SCC)敏感性。通过慢应变速率拉伸试验得到相应的应力-应变曲线。结果表明, 在本次试验工况下三种奥氏体不锈钢的屈服强度、抗拉强度和延伸率都非常接近, 但镍基合金718的强度远高出其他材料, 同时延伸率也大幅降低。扫描电镜对试样侧面以及断口形貌的观察分析发现:316Ti和TP347的失效模式均为穿晶韧性断裂; HR3C则表现为沿晶和穿晶的混合型韧性断裂; 718的失效模式则几乎全是沿晶的脆性断裂。
慢应变速率拉伸试验
应力应变曲线
应力腐蚀开裂
supercritical water(SCW)
SSRT
stress-strain curve
SCC
Abstract
The stress corrosion cracking(SCC) susceptibility of austenitic stainless steels 316Ti, HR3C, TP347 and nickel-based alloy 718 in supercritical water(SCW)at 550 ℃/25 MPa was studied. Slow strain rate tests (SSRT) were used to obtain the stress-strain curves. The results show that the yield strength and tensile strength of 718 were much higher than those of the other three austenitic stainless steels while the elongation of 718 was significantly lower. Scanning electron microscopy observations of fracture surfaces reveal. that the failure mode of 316Ti and TP347 was transgranular ductile fracture, the failure mode of HR3C was both intergranular and transgranular ductile fracture and the failure mode of 718 was almost intergranular stress corrosion cracking (IGSCC).
中图分类号 TG172
所属栏目 试验研究
基金项目 国家“973”重点基础研究发展计划(2007CB209802)
收稿日期 2011/11/17
修改稿日期
网络出版日期
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备注李力, 硕士研究生,
引用该论文: LI Li,ZHANG Le-fu,TANG Rui. Stress Corrosion Cracking Susceptibility of Austenitic Stainless Steels and Nickel-based Alloy in Supercritical Water at 550 ℃/25 MPa[J]. Corrosion & Protection, 2012, 33(11): 928
被引情况:
【1】陈安源,盖秀颖, "加热器TP304不锈钢换热管腐蚀泄漏原因分析",理化检验－物理分册 50, 140-144(2014)
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【2】Katada Y, Nagata N. The effect of temperature on fatigue crack growth behavior of a low-alloy pressure vessel steel in a simulated BWR environment[J]. Corrosion Sci, 1985, 25:693.
【3】Atkinson J D, Yu J. Role of dynamic strain ageing in the environment assisted cracking observed in pressure vessel steels[J]. Fatigue Fract Eng Mater Struct, 1997, 20:1.
【4】钱匡武, 彭开萍, 陈文哲, 等. 金属动态应变时效现象中的“锯齿屈服”[J]. 福建工程学院学报, 2003, 1(1): 4-8.
【5】关矞心, 李岩, 董超芳, 等. 高温水环境下温度对316L不锈钢应力腐蚀开裂的影响[J]. 北京科技大学学报, 2009, 31(9): 1122-1126.
【6】Fournier L, Delafosse D, Bosch C, et al. Stress corrosion cracking of nickel base super alloys in aerated supercritical water[C]//Corrosion NACE, Houston TX: Paper No.01361.
【7】Tsuchiya Y, Kano F, Saito N, et al. SCC and irradiation properties of metals under supercritical water cooled power reactor conditions[C]//Kyoto Japan: GENES4/ANP2003, Paper 1096, September, 2003.
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