铁路货车车体用耐候钢的抗应力腐蚀性能  

Stress Corrosion Behavior of Car Body Steel for Rail Wagons

作　　者：吴毅 尹鸿祥 范静 樊孝文 薛俊鹏 WU Yi;YIN Hongxiang;FAN Jing;FAN Xiaowen;XUE Junpeng(Metal and Chemistry Research Institute,China Academy of Railway Sciences Corporation Limited,Beijing 100081,China;ANGONG Corrosion Testing Laboratory Technology(Wuxi)Co.,Ltd.,Wuxi 214000,China)

机构地区：[1]中国铁道科学研究院集团有限公司金属及化学研究所,北京100081 [2]安工腐蚀检测实验室科技(无锡)有限公司,无锡214000

出　　处：《腐蚀与防护》2021年第10期23-27,共5页Corrosion & Protection

基　　金：国家重点研发计划(2017YFB0304600)。

摘　　要：以Q450NQR1和S500AW两种车体钢为研究对象,通过选用四点弯曲、U型弯曲、慢应变速率拉伸的应力加载方式和电化学测试相结合,研究了这两种车体钢的应力腐蚀开裂敏感性。结果表明:经50%屈服强度应力加载后,两种四点弯曲试样的开路电位最高,提高载荷,电位逐渐负移;经U型弯曲试验后,两种试样弯曲处均未发现裂纹,且随着腐蚀时间的延长,其开路电位负移并逐渐趋于稳定;经慢应变速率试验后,S500AW试样的屈服后塑性变形区域及弹性变形区域高于Q450NQR1试样的,其力学性能更好。Taking Q450NQR1and S500AW car body steels as research objects,the stress corrosion cracking susceptibility of two car body steels was studied through four-point bending,U-shaped bending,slow strain rate tensile loading methods combined with electrochemical tests.The results showed that the open circuit potential of the two four-point bending specimens was the highest after being loaded with 50%yield strength stress.When the load increased,the potential gradually shifted negatively.After U-shaped bending test,no cracks were found in the bend of the two samples,and with the extension of the corrosion time,the open circuit potential shifted negatively and gradually stabilized.After the slow strain rate test,the post-yield plastic deformation area and elastic deformation area of the S500AW specimen were higher than those of the Q450NQR1specimen,and its mechanical properties were relatively good.

关 键 词：车体钢 应力腐蚀 四点弯曲 U型弯曲 慢应变速率试验 腐蚀电化学 

分 类 号：TG172.9[金属学及工艺—金属表面处理]