快速球化退火对SKS51工模具钢组织和硬度的影响
Effect of Rapid Spheroidizing Annealing on Microstructure and Hardness of SKS51 Die Steel
摘 要
基于离异共析原理对SKS51钢进行快速球化退火处理（包括奥氏体化和等温球化两个阶段），研究了奥氏体化温度（750，780 ℃）、奥氏体化保温时间（10，20 min）和等温球化温度（650，680，700 ℃）对显微组织和硬度的影响。结果表明：在试验条件下，升高奥氏体化温度或延长奥氏体化保温时间均会导致钢中片状碳化物增多，球化效果变差，硬度增高；经750 ℃×10 min奥氏体化后，随等温球化温度升高，SKS51钢中的球状碳化物含量增加，尺寸增大，硬度降低；经750 ℃×10 min+700 ℃×2 h快速球化退火后，SKS51钢中的球状碳化物最多，硬度最低。
快速球化
显微组织
离异共析
SKS51 die steel
rapid spheroidizing
microstructure
divorced eutectoid
Abstract
The SKS51 steel was subjected to rapid spheroidizing annealing treatment (including two stages of austenitizing and isothermal spheroidizing) based on the principle of divorced eutectoid transformation. The effects of the austenitizing temperature (750, 780 ℃), austenitizing holding time (10, 20 min) and isothermal spheroidizing temperature (650, 680, 700 ℃) on the microstructure and hardness were studied. The results show that under the test conditions, by increasing the austenitizing temperature or prolonging the austenitizing holding time, the flaky carbides in the steel increased in number, the spheroidizing effect became deteriorating, and the hardness increased. After austenitizing at 750 ℃ for 10 min, with the increase of the isothermal spheroidizing temperature, the content and size of spherical carbides in the SKS51 steel increased, and the hardness decreased. After 750 ℃×10 min+700 ℃×2 h rapid spheroidizing annealing, the SKS51 steel had the largest number of spherical carbides and the lowest hardness.
中图分类号 TG142.1 TG161 DOI 10.11973/jxgccl202108016
所属栏目 材料性能及应用
基金项目 湖南华菱涟源钢铁有限公司科研项目（201708）；湖南省自然科学基金资助项目（2016JJ6045）
收稿日期 2020/7/28
修改稿日期 2021/6/17
网络出版日期
作者单位点击查看
备注封举宁(1999-),男,湖南永州人,助理工程师,学士
引用该论文: FENG Juning,TAN Fengliang,LI Hongjuan,ZENG Bing,WANG Li,YE Qinzheng. Effect of Rapid Spheroidizing Annealing on Microstructure and Hardness of SKS51 Die Steel[J]. Materials for mechancial engineering, 2021, 45(8): 87～90
封举宁,谭峰亮,李鸿娟,曾斌,汪力,叶勤政. 快速球化退火对SKS51工模具钢组织和硬度的影响[J]. 机械工程材料, 2021, 45(8): 87～90
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【8】吕英怀,张芝安,孙宝臣.中碳钢快速球化退火工艺的研究[J].东北重型机械学院学报,1994, 18(4):323-326. LV Y H, ZHANG Z A, SUN B C. Research on fast spheroidizing annealing process of medium carbon steel[J]. Journal of Northeast Heavy Machinery Institute, 1994, 18(4):323-326.
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