304奥氏体不锈钢焊缝低温热老化后的显微组织与力学性能
Microstructure and Mechanical Properties of 304 Austenitic Stainless Steel Weld after Low Temperature Thermal Aging
摘 要
针对压水堆核电站堆内构件用304奥氏体不锈钢的焊缝在325,365,400 ℃热老化不同时间后的组织和力学性能进行了研究,并与热老化前的进行了对比。结果表明:热老化后,焊缝组织以及焊缝中铁素体相和奥氏体相中的主要元素含量均没有明显变化,焊缝的显微硬度明显增大,但奥氏体相的显微硬度没有明显变化,焊缝的冲击功显著下降,拉伸性能的变化较小;热老化温度越高,焊缝力学性能的变化越大。
奥氏体不锈钢
焊缝
显微硬度
冲击韧性
thermal aging
austenitic stainless steel
weld
micro-hardness
impact toughness
Abstract
The microstructure and mechanical properties of the weld of 304 austenitic stainless steel used in PWR(pressurized water reactor) nuclear powder plants reactor internals after thermal aging at 325 ℃, 365 ℃ and 400 ℃ for different time were studied and compared with those before thermal aging. The results show that, after thermal aging, the microstructure in the weld and the main alloy elements contents in ferrite and austenite all had no obvious changes, the micro-hardness of the weld increased obviously but that of the austenite had no obvious changes, and the impact energy sharply decreased and the tensile properties changed less. The higher the thermal aging temperature, the greater the changes of the mechanical properties of the weld.
中图分类号 TG142.71
所属栏目 试验研究
基金项目 国家科技重大专项资助项目(2011ZX06004-002)
收稿日期 2014/2/7
修改稿日期 2014/9/1
网络出版日期
作者单位点击查看
备注罗强(1979-),男,四川内江人,助理研究员,硕士。
引用该论文: LUO Qiang,CHEN Yong,ZHOU Jun,HE Kun,REN Li-ping. Microstructure and Mechanical Properties of 304 Austenitic Stainless Steel Weld after Low Temperature Thermal Aging[J]. Materials for mechancial engineering, 2014, 38(11): 31～34
罗强,陈勇,周军,何琨,任黎平. 304奥氏体不锈钢焊缝低温热老化后的显微组织与力学性能[J]. 机械工程材料, 2014, 38(11): 31～34
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参考文献
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【3】杨武.核电设备耐蚀材料及其评价技术［J］.机械工程材料,1994,18(2):16-19.
【4】CHOPRA O K,AYRAULT G.Aging degradation of cast stainless steel:status and program ［J］.Nuclear Engineering and Design,1985,6:305-318.
【5】CHUNG H M,CHOPRA O K.Microstructures of cast-duplex stainless steel after long-term aging［J］.Mater Sci Technol,1990,6:249-262.
【6】CHOPRA O K,CHUNG H M.Aging of cast-duplex stainless steel in LWR systems ［J］.Nuclear Engineering and Design,1985,89:305-318.
【7】李时磊,王艳丽,李树肖,等.长期热老化对铸造奥氏体不锈钢组织和性能的影响［J］.金属学报,2000,46(10):1186-1191.
【8】CHUNG H M,CHOPRA O K.Kinetics and mechanism of thermal aging embrittlement of duplex stainless steels ［J］.International Journal of Pressure Vessels and Piping,1992,50:179-213.
【9】SEIICHI K,NARUO S,GENTA T.Microstructural changes and fracture behavior of CF8M duplex stainless steels after long-term aging［J］.Nuclear Engineering and Design,1997,13:121-232.
【10】PUMPHREY P H,AKHURST K N.Aging kinetics of CF3 cast stainless steel in temperature range 300-400℃［J］.Materials Science and Technology,1990,6:211-219.
【11】VITEK J M,DAVID S A,ALEXANDER D J.Microscopic evaluation of low-temperature embrittlement in type 308 stainless steel welds［J］.Acta Metall,1991,39:503-516.
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