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| A study on quenching cracking behavior in a nickel-based P/M superalloy ring-shaped worked piece |
| LI Kemin1.，WANG Yixing1.，LIN Xinan1.，LI Yang1.，LIU Jiantao1.，LIU Mingdong1. |
| （1.Central Iron and Steel Research Institute，High Temperature Material Institute，Beijing 100081，China；
2. Beijing CISRI-Gaona Materials Technology Co Ltd，Beijing 100081，China） |
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Abstract ：According to the cracking behavior of FGH4095 alloy ring part in the process of heat treatment quench‐
ing, the quench cracking mechanism was clarified based on the metallographic analysis of the microstructure of the
cracking fracture, combined with the numerical simulation of the stress field and temperature field in the quenching
process, and the effective measures to solve the quench cracking were given. It is concluded that the dynamic
embrittlement occurs in the grain boundary of FGH4095 ring part during quenching under the combined action of
tensile stress and oxidation, leading to the cracking along the circumferential direction, and the fracture presents
typical intergranular embrittlement characteristics. The quenching cracking can be eliminated by coating the sur‐
face of the ring part with antioxidant coating before heat treatment.
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Received: 09 November 2022
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2023, Vol. 33 
