1Cr18Ni10Ti不锈钢管扩口开裂失效分析
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摘要
1Cr18Ni10Ti不锈钢导管在扩口时,喇叭口外表面出现了裂纹。采用光学显微镜、显微硬度计对钢管的表面形貌、显微组织、显微硬度进行了检测分析。结果表明:导管原材料在经氨分解气氛保护热处理中残留氨控制不当,在高温下分解出N原子,导致管材表面产生硬脆的渗氮层,塑性降低,造成扩口时开裂。
Cracks were found on outer surface of 1 Cr18 Ni10 Ti stainless steel after flaring process. Surface topography,microstructure,and microhardness were investigated by using microscope and microhardness tester. The results show that due to the ammonia decomposition protection atmosphere is not appropriately controlled in heat treatment of the raw materials for tube-making,the Nitrogen atoms decomposed from the residual ammonia in the high temperature result in a hard and brittle nitriding layer on the surface of the raw materials,which reduces the plasticity of the raw material,and induce crackings at the outer surface of tube after flaring.
Cracks were found on outer surface of 1 Cr18 Ni10 Ti stainless steel after flaring process. Surface topography,microstructure,and microhardness were investigated by using microscope and microhardness tester. The results show that due to the ammonia decomposition protection atmosphere is not appropriately controlled in heat treatment of the raw materials for tube-making,the Nitrogen atoms decomposed from the residual ammonia in the high temperature result in a hard and brittle nitriding layer on the surface of the raw materials,which reduces the plasticity of the raw material,and induce crackings at the outer surface of tube after flaring.
引文
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[3]闫红彦,罗义山,蒋鹏,等.氨分解气氛在热处理上的应用[J].机械产品与科技,2000(3):22-27.
[4]李炯辉.金属材料金相图谱[M].北京:机械工业出版社,2006.
[5]赵品,张艳新. A3钢与奥氏体不锈钢冷轧复合板的固溶氮化[J].钢铁研究学报,2002,14(5):41-44.Zhao Pin,Zhang Yanxin. Solid solution nitriding of cold-rolled sheet composited by A3 steel and austenitic stainless steel[J]. Journal of Iron and Steel Research,2002,14(5):41-44.
[6]Porter D A,Easterling K E. Phase Tansformations in Metals and Alloys[M]. London:Chapman and Hall,1992:60-109.
[7]任家宽,吴思炜,陈其源,等. Ti含量对低碳钢力学性能的影响[J].金属热处理,2017,42(6):137-141.Ren Jiakuan,Wu Siwei,Chen Qiyuan,et al. Influence of Ti content on mechanical properties of low carbon steel[J]. Heat Treatment of Metals,2017,42(6):137-141.
[8]刘伟,涂益友,丁建刚,等,氨分解气氛保护退火对冷轧不锈钢带组织及硬度影响[J].金属热处理,2009,34(10):53-56.Liu Wei,Tu Yiyou,Ding Jiangang,et al. Effects of annealing with ammonia dissociated protective atmosphere on microstructure and hardness of cold rolled stainless steel strip[J]. Heat Treatment of Metals,2009,34(10):53-56.