摘要
为掌握粉末包埋渗硼(B)工艺后冷却方式对其组织性能影响规律,采用粉末包埋法在40Cr基体表面制备了渗B层,利用X射线衍射仪、场发射扫描电子显微镜、能量色散光谱仪、显微硬度测试仪、摩擦磨损试验仪等研究了炉冷、空冷、液氮冷和水冷条件下渗B层的物相、界面组织和性能。结果表明:冷却速率对渗B层组织形貌影响很小,所有渗层均由Fe^(2)B柱状晶粒组成,但随着冷却速率的增加,渗B层逐渐出现微裂纹;存在一临界冷却速率v c(100℃/s<v c<1000℃/s),能够改变Fe^(2)B晶粒的择优取向生长;炉冷条件下的渗B层有最高的平均硬度、致密度以及最优的耐磨性。
To get the effect of cooling modes on microstructure and properties after powder-embedded boronizing process,a B-layer was prepared on the surface of 40Cr steel by using pack cementation.The effect of furnace cooling,air cooling,liquid nitrogen cooling,and water cooling on the phase,interface structure and properties of the B-layer was studied by X-ray diffractometer,field emission scanning electron microscope,energy dispersive spectrometer,micro-hardness tester,friction and wear tester.Results showed that the cooling rate had litter effect on the morphology of the B-layer,and all B-layers were composed of columnar Fe^(2)B grains.However,as the cooling rate increased,micro-cracks gradually formed in the B-layer.There was a critical cooling rate(100℃/s<v c<1000℃/s),which could change the preferential orientation growth of columnar Fe^(2)B grains.The B-layer prepared under the furnace cooling condition had the highest average hardness,density and best wear resistance.
作者
胡建军
裴尧鑫
郭宁
曾敬
HU Jian-jun;PEI Yao-xin;GUO Ning;ZENG Jing(College of Material Science and Engineering,Chongqing University of Technology,Chongqing 400054,China;Chongqing Municipal Key Laboratory of Institutions of Higher Education for Mould Technology,Chongqing 400054,China;School of Materials and Energy,Southwest University,Chongqing 400715,China)
出处
《材料保护》
CAS
CSCD
2021年第6期122-127,共6页
Materials Protection
基金
国家自然科学基金资助项目(51575073)。
