摘要
对棒状的正火态45钢进行室温冲击强化实验,载荷作用在试样的横截面,对冲击强化后的试样进行显微硬度测试;对冲击强化前后的正火态45钢进行时效处理,加热至450℃保温10~40 min,对时效处理后的试样进行显微硬度测试;对时效处理前后的冲击强化试样进行XRD测试分析。结果表明:本次实施的冲击强化可以提高正火态45钢的显微硬度,提高45 HV,但试样的横截面上的硬度分布不均匀,呈现由心部到边部上升的趋势;时效处理可以提高冲击强化后试样的显微硬度,合金的内部组织由珠光体转变成托氏体,合金整体表现出良好的热稳定性;XRD测试的结果表明试样主要合金元素的含量在局部有所变化,进而从元素含量的角度验证了时效处理能够提高冲击强化试样的显微硬度。本研究有助于对现有45钢应用性能改良提供参考。
The bar-shaped normalizing 45 steel was subjected to impact strengthening at room temperature,the load was applied to the cross section of the specimen,and the microhardness of the specimen after impact strengthening was tested.The normalizing 45 steel before and after impact strengthening was aged and heated to 450℃for 10-40 min.The microhardness of the specimens was tested.XRD test was carried out on the impact strengthened samples before and after aging treatment.The results show that the impact strengthening can improve the microhardness of normalized 45 steel,and the value is increased by 45HV.However,the hardness distribution on the cross section of the sample is not uniform,showing an upward trend from the center to the edge.Aging treatment can improve the microhardness of the specimen after impact strengthening,the internal structure of the alloy changeds from pearlite to tortenite,and the whole alloy shows good thermal stability.XRD test results show that the content of the main alloy elements in the sample changes locally,and then verify that the aging treatment can improve the microhardness of the impact strengthening sample from the point of view of the element content.This study is helpful to provide reference for the improvement of the application performance of 45 steel.
作者
姬帅
王海丽
李星辰
JI Shuai;WANG Haili;LI Xingchen(School of Materials Science and Engineering,Xi'an Shiyou University,Xi'an 710065,China;State Key Laboratory of Materials-Oriented Chemical Engineering,Nanjing Tech University,Nanjing 210009,China)
出处
《热加工工艺》
北大核心
2022年第18期112-116,共5页
Hot Working Technology
基金
省级科研创新训练项目(S202010705104,S201910705050)
材料电磁过程研究教育部重点实验室(东北大学)资助项目(NEU-EPM-013)
广西电子信息材料构效关系重点实验室(桂林电子科技大学)资助项目(201014-K)。
关键词
45钢
冲击强化
时效处理
珠光体
显微硬度
45 steel
impact strengthening
aging treatment
pearlite
microhardness
