Effect of annealing cooling rate on microstructure and mechanical property of 100Cr6 steel ring manufactured by cold ring rolling process
来源期刊：中南大学学报(英文版)2014年第1期
论文作者：WEI Wen-ting(魏文婷) WU Min(吴敏)
文章页码：14 - 19
Key words：ring rolling; annealing; cooling rate; microstructure; mechanical property
Abstract: Pre-heat treatment is a vital step before cold ring rolling and it has significant effect on the microstructure and mechanical properties of rolled rings. The 100Cr6 steel rings were subjected to pre-heat treatment and subsequent cold rolling process. Scanning electron microscopy and tensile tests were applied to investigate microstructure characteristic and mechanical property variations of 100Cr6 steel rings undergoing different pre-heat treatings. The results indicate that the average diameter of carbide particles, the tensile strength and hardness increase, while the elongation decreases with the decrease of cooling rate. The cooling rate has minor effect on the yield strength of sample. After cold ring rolling, the ferrite matrix shows a clear direction along the rolling direction. The distribution of cementite is more homogeneous and the cementite particles are finer. Meanwhile, the hardness of the rolled ring is higher than that before rolling.
WEI Wen-ting(魏文婷)1, 2, WU Min(吴敏)3
(1. School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China;
2. Hubei Key Laboratory of Advanced Technology of Automotive Parts (Wuhan University of Technology),
Wuhan 430070, China;
3. Technical Center of Dongfeng Motor Corporation, Wuhan 430058, China)
Abstract:Pre-heat treatment is a vital step before cold ring rolling and it has significant effect on the microstructure and mechanical properties of rolled rings. The 100Cr6 steel rings were subjected to pre-heat treatment and subsequent cold rolling process. Scanning electron microscopy and tensile tests were applied to investigate microstructure characteristic and mechanical property variations of 100Cr6 steel rings undergoing different pre-heat treatings. The results indicate that the average diameter of carbide particles, the tensile strength and hardness increase, while the elongation decreases with the decrease of cooling rate. The cooling rate has minor effect on the yield strength of sample. After cold ring rolling, the ferrite matrix shows a clear direction along the rolling direction. The distribution of cementite is more homogeneous and the cementite particles are finer. Meanwhile, the hardness of the rolled ring is higher than that before rolling.
Key words:ring rolling; annealing; cooling rate; microstructure; mechanical property
