Microstructure characteristics of segregation zone in 17-4PH stainless steel piston rod

IF 3.1 2区 材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING
Jia-long Tian , Wei Wang , Wei Yan , Zhou-hua Jiang , Yi-yin Shan , Ke Yang
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引用次数: 5

Abstract

The segregation of Cu and Ni in a 17-4PH stainless steel piston rod has been confirmed to be responsible for the cracking after heat treatment. Further investigation showed that the segregation zone was composed of three layers, namely the fine grain martensitic layer, the coarse grain martensitic layer and the coarse grain austenitic layer from the matrix to the crack surface. Three button ingots with the same chemical compositions as those three layers have been prepared to evaluate the grain size distribution, microstructure and mechanical properties. The effects of Cu and Ni segregation on the microstructures of those three layers have been explored by thermodynamic calculation. Based on the microstructure and mechanical properties results, an intensive understanding of the cracking in the segregation zone was therefore reached.

17-4PH不锈钢活塞杆偏析区组织特征
17-4PH不锈钢活塞杆热处理后出现裂纹的原因是Cu和Ni的偏析。进一步研究表明,从基体到裂纹表面,偏析区由细晶马氏体层、粗晶马氏体层和粗晶奥氏体层三层组成。制备了3个化学成分与这3层相同的钮扣锭,对其粒度分布、显微组织和力学性能进行了评价。通过热力学计算探讨了Cu和Ni偏析对这三层微观组织的影响。基于显微组织和力学性能的结果,对偏析区开裂有了深入的了解。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
CiteScore
4.30
自引率
0.00%
发文量
2879
审稿时长
3.0 months
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