Q. Gao
,
Y.X. Zhao and L.X. Cai (Institute of Applied Mechanics
,
Southwest Jiaotong University
,
Chengdu 610031
,
China)
金属学报(英文版)
Based on the test results obtained from the single-step test and the incremental-step test at room temperature and 240℃, a probabilistic assessment of temperature effects on the cyclic stress-strum response and the fatigue life of 1Cr18Ni9Ti steel weld metal is performed. In orber to assess the temperature effect on cyclic stress amplitude where there is a scatter of the material cyclic constitution, a probabilistic assessment approach on the basis of probabilistic modified Ramberg-Osgood relations is introduced.The investigation shows that the cyclic stress amplitude and the scatter of cyclic stress amplitude data are decreased at 240℃. Similarly, from the consideration of the fatigue life scatter a probabilistic assessment of temperature effect on the fatigue life is suggested on the basis of probabilistic Langer S-N relations. The investigation shows that the crack initiation life is increased and the scatter of crack initiation life data is decreased at 240℃.
关键词:
1Cr_(18)Ni_9Ti stainless steel
,
null
,
null
,
null
,
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黄鹤飞
,
李健健
,
刘仁多
,
陈怀灿
,
闫隆
金属学报
doi:10.11900/0412.1961.2014.00099
采用7 MeV的Xe26+和1 MeV的Xe20+在室温和600℃下分别对316SS块体和TEM试样进行了辐照实验.利用纳米压痕仪测试材料辐照损伤前后的显微硬度,利用TEM观察辐照损伤前后的微观结构演变,并将室温和600℃的实验结果进行了比对.结果表明,室温离子辐照造成316SS中形成大量尺寸在3～8 nm之间的位错环缺陷,它们会阻碍材料内位错线的自由移动,进而导致材料的硬化.在600℃辐照下,316SS内形成了尺寸介于4～12 nm之间的溶质原子团簇缺陷.尽管其尺寸较室温辐照下形成的位错环有轻微的增大,但是其体积密度较前者显著地降低,辐照硬化现象发生了明显的回复,材料辐照损伤行为存在温度效应.
关键词:
316奥氏体不锈钢
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氙离子辐照
,
辐照硬化
,
温度效应
