不同温度时效后17-4PH不锈钢的高周腐蚀疲劳性能  

High cycle corrosion fatigue properties of 17-4PH stainless steel aged at different temperatures

作　　者：高艾瑞 高圆[1] 席生岐[1] 石联峰[2] 梁刚[2] 高振旭 Gao Airui;Gao Yuan;Xi Shengqi;Shi Lianfeng;Liang Gang;Gao Zhenxu(State Key Laboratory of Metal Material Strength,School of Materials Science and Engineering,Xi'an Jiaotong University,Xi'an Shaanxi 710049,China;Dongfang Electric Group Dongfang Turbine Co.,Ltd.,Deyang Sichuan 618000,China)

机构地区：[1]西安交通大学材料科学与工程学院金属材料强度国家重点实验室,陕西西安710049 [2]东方电气集团东方汽轮机有限公司,四川德阳618000

出　　处：《金属热处理》2021年第4期187-192,共6页Heat Treatment of Metals

基　　金：东方汽轮机有限公司合作项目(20181002);海洋腐蚀与防护重点实验室开放研究基金(6142901180402)。

摘　　要：对17-4PH不锈钢进行固溶+稳定化+时效处理,分析了568℃和605℃两种温度时效后17-4PH不锈钢的显微组织、硬度、裂纹扩展速率、腐蚀疲劳断口以及疲劳极限。结果表明:时效温度为568℃的17-4PH不锈钢疲劳极限相对于605℃时效温度的疲劳极限明显提高,其疲劳裂纹扩展门槛值高于605℃的,疲劳扩展速率明显低于605℃的。两种温度时效后钢的疲劳断口均属于解理断裂。17-4PH stainless steel was treated with solid solution,stabilization and aging treatments,then the microstructure,hardness,crack growth rate,corrosion fatigue fracture and fatigue limit of the 17-4PH stainless steel aged at 568℃and 605℃respectively were analyzed.The results show that the fatigue limit of 17-4PH stainless aged at 568℃is significantly higher than that aged at 605℃.For the specimen aged at 568℃,the fatigue growth rate is lower than that aged at 605℃,while the threshold of fatigue crack propagation is higher than the latter.The fatigue fractures of the tested steel after aging at 568℃and 605℃are both belonging to cleavage fracture.

关 键 词：17-4PH不锈钢 高周腐蚀疲劳 疲劳性能 裂纹扩展 

分 类 号：TG161[金属学及工艺—热处理]