The Effect of Pre-deformation at Elevated Temperatures on the Microstructure and Hardness of Boron Steel 22MnB5
To investigate the effects of the pre-deformation and deformation temperature on the microstructure and hardness of boron steel 22MnB5, isothermal tensile tests were carried out on the Gleeble 3800 system when the temperatures are 700℃, 750℃, 800℃, respectively. Three specimens were employed to obtain different deformation levels at each temperature. The cooling rate before and after deformation was 30℃/s. Then the microstructures of the specimens were observed and the harness of each specimen was measured. The results show the martensitic fraction decreases and the ferrite fraction increases with decreasing the deformation temperature or increasing the deformation level. The specimens deformed at higher temperature have greater hardness. The hot plastic deformation of austenite shortens the incubation period of ferrite transformation and accelerates the transformation rate. In addition, the isothermally holding time is longer in the case of a larger deformation amount, more austenite will transform to ferrite.Especially, the specimen deformed at 700℃ and with large deformation has almost full massive ferrite microstructure with larger size.
22MnB5 hot pre-deformation microstructure hardness
MIN Jun-ying LIN Jian-ping XIN Li-jiu LI Jia-yue DING Lei FENG Qi
College of Mechanical Engineering, Tongji University, Shanghai 201804, China SAIC Motor Corporation Limited, Shanghai 201804, China
国际会议
The 6th International Conference on High Strength Low Alloy Steels(第六届高强度低合金钢国际会议HSLA Steels2011)
北京
英文
546-549
2011-05-31（万方平台首次上网日期，不代表论文的发表时间）