Analysis and Process Improvement of Mixed Crystal in Warm Forged 20CrH Inner Star Wheel

徐乐钱; 左锦中; 袁静; 莫秉干; 吴炜

doi:10.20057/j.1003-8620.2022-00148

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Analysis and Process Improvement of Mixed Crystal in Warm Forged 20CrH Inner Star Wheel

更新时间：2026-01-21

- Analysis and Process Improvement of Mixed Crystal in Warm Forged 20CrH Inner Star Wheel
- Special Steel Vol. 44, Issue 2, Pages: 21-24(2023)
- 作者机构：
  
  中天钢铁集团有限公司技术中心,常州,213011
- 作者简介：
- 基金信息：
- DOI：10.20057/j.1003-8620.2022-00148
  CLC：
- Received：04 December 2022，
  
  Online First：24 March 2023，
  
  Published：24 March 2023
- 稿件说明：
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徐乐钱, 左锦中, 袁静, et al. Analysis and Process Improvement of Mixed Crystal in Warm Forged 20CrH Inner Star Wheel[J]. Special Steel, 2023, 44(2): 21-24.
DOI：

徐乐钱, 左锦中, 袁静, et al. Analysis and Process Improvement of Mixed Crystal in Warm Forged 20CrH Inner Star Wheel[J]. Special Steel, 2023, 44(2): 21-24. DOI： 10.20057/j.1003-8620.2022-00148.

摘要

特钢厂生产的20CrH特殊钢棒材，下游用户温锻制作内星轮后，经965℃×6 h渗碳热处理后发现混晶现象。采用光学显微镜观察并设计热处理试验验证，结果表明：锻造变形温度不均及锻后保温温度偏低，导致在后续渗碳过程中局部奥氏体晶粒出现异常长大而产生混晶。将内星轮温锻后保温温度由710℃提高至900℃

能有效改善混晶现象，为同类特殊钢零部件温锻的工艺设计提供指导。

Abstract

The 20CrH special steel bar produced by a special steel factory

after warm forging to make inner star wheel by the downstream user

the mixed crystal phenomenon was found after carburizing heat treatment at 9655 ℃×6 h.Using light microscope observation and design of heat treatment test for verification

the results show that the uneven temperature of forging deformation and the low temperature of holding after forging lead to the abnormal growth of local austenite grains in the subsequent carburizing process and the formation of mixed grains. The temperature preservation of the inner star wheel after warm forging is increased from 710 ℃ to 900℃

which can effectively avoid crystal mixing and provides guidance for the process design of warm forging of similar special steel parts.

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