Transactions of Materials and Heat Treatment

Title：Cause analysis and improvement on the forged crack for Ni80Cr20 alloy plate

Authors： Fan Jinxi Gu Yanlong Hu Xianjun Bao Binghui

Unit： Institute of Research of Iron and Steel of Shasteel

KeyWords： Ni80Cr20 alloy forged crack brittle intergranular fracture microstructure pellicular carbide

ClassificationCode：TG142.73

year,vol(issue):pagenumber：2018,43(11):13-16

Abstract：

By scanning electron microscope, energy spectrum and a single pass compression test fracture mode, microstructure and the thermal simulated microstructure on the surface crack of forged Ni80Cr20 alloy plate were analyzed, the causes of forging cracks in Ni80Cr20 alloy plate were studied, and the solution was developed. The results show that the fracture mode of the forged crack on the surface crack of forged plate Ni80Cr20 alloy is brittle intergranular fracture, and the microstructure of the forged plate displays that the grain boundary is covered with the pellicular carbide. However, it still exists within the range of 980-1050 ℃ in the process of forging. Therefore, the pellicular carbide at the grain boundary of Ni80Cr20 alloy results in crystal boundary weakening and still exists during the forging process. Furthermore, micro-crack comes into being and develops at the grain boundary under the action of forged stress, and the forged crack is formed at last. Thus, when the carbon content in Ni80Cr20 alloy is limited less than 0.01%， the pellicular carbide at the grain boundary disappears, and the crack on the forged plate does not appear.

Funds：

张家港科技攻关计划项目(ZKG1614)

范金席（1987-），男，硕士，助理研究员,E-mail：jxhyfan@163.com;通讯作者：胡显军(1975-),男,博士,研究员级高级工程师,E-mail：huxj-iris@shasteel.cn

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