摘要
本文研究了喷丸处理对3Cr2W8V热作模具钢的冷热疲劳性能、表面残余应力分布和表面形貌变化等影响规律。试验结果表明,喷丸对热作模具钢强化作用的主要原因是:(1)可改善工件表面形态,减少和消除脆性材料对应力集中的敏感性;(2)在约200～400μm厚的表层造成压应力((?)_R=-500MPa),且达600℃应力也不会完全释放;(3)可产生由表面应力诱(?)的相变和晶粒碎化效应。并介绍了喷丸强化技术用于热锻模具的使用效果.
In this paper the influence of shot-peening tochnology on the hot-cold fatigue, the residual stress and micro-structure of 3Cr2W8V hot working die steel have been experimented. The results indicated that after shot-peening proce(?)s the improvement of hot working die steel properties was mainly caused by follows; (1) the surface microcracks formed during the fabricating process could been reduced and removed. The microcracks will seriously reduce the steel properties, especially for high hardenness steels; (2) a strengthening layer formed about 200～400μm thickness and 500MPa residual compressive stresses, which could not been released completely up to 600℃: (3) the austenite trasformation and grain distortion effect are induced. The application of this technology for hot forging die is introduced.
出处
《金属热处理》
CAS
CSCD
北大核心
1989年第5期29-34,共6页
Heat Treatment of Metals
