摘要
通过测量不同回火温度下20Cr1Mo1VTiB螺栓钢的拉伸性能、冲击性能和显微硬度,结合SEM、EBSD、TEM表征,明确了回火温度对20Cr1Mo1VTiB螺栓钢显微组织与力学性能的影响规律。结果表明,随着回火温度的升高,试验钢贝氏体板条宽度不断增加,并逐渐向多边形铁素体转变,同时钢中碳化物尺寸及形貌也发生变化,晶界VC逐渐长大,晶内针状M_(3)C变为短棒状,方形TiC尺寸增加且形貌开始向球形转变。结合力学性能检测结果,建议对螺栓进行690℃×4 h回火处理,螺母进行720℃×4 h回火处理,使两者的硬度获得较为理想的匹配。
Microstructure and mechanical properties of 20Cr1Mo1VTiB bolt steel at different tempering temperatures were studied by means of SEM,EBSD,TEM,tensile tester,impact tester and hardness tester.The results show that the width of lath bainite in the steel increases and the bainite transforms into polygonal ferrite gradually with the increase of tempering temperature.Meanwhile,the increasing tempering temperature also promotes the coarsening and morphology transformation of carbides precipitation.The VC on grain boundary grows,the acicular M_(3C) grows into short rod-like and the tetragonal TiC grows and transforms into spherical.By testing the mechanical properties,it is recommended that the bolts should be tempered at 690 ℃×4 h and the nuts should be tempered at 720 ℃×4 h to obtain an ideal hardness matching.
作者
龚雪婷
赵吉庆
杨钢
杨滨
Gong Xueting;Zhao Jiqing;Yang Gang;Yang Bin(China Institute of Atomic Energy,Beijing 102413,China;Research Institute of Special Steels,Central Iron and Steel Research Institute Co.,Ltd.,Beijing 100081,China;Collaborative Innovation Center of Steel Generic Technology,University of Science and Technology Beijing,Beijing 100083,China)
出处
《金属热处理》
CAS
CSCD
北大核心
2023年第7期117-123,共7页
Heat Treatment of Metals
基金
国家自然科学基金(51971226)。
