摘要
采用机械球磨和激光选区熔化成形方法,制备了不同TiB_(2)质量分数(0.6%,1.2%,1.8%)的TiB_(2)/4Cr13钢复合材料,研究了TiB_(2)含量对复合材料物相组成、微观形貌、硬度、耐磨性能和耐腐蚀性能的影响。结果表明:复合材料由α-Fe、γ-Fe、TiB_(2)等相组成;随着TiB_(2)含量的增加,复合材料的相对密度降低;当TiB_(2)质量分数为0.6%时,复合材料的组织最为细小均匀,随着TiB_(2)含量的继续增加,晶粒尺寸增大,且组织中出现裂纹、微孔等缺陷;随着TiB_(2)含量增加,复合材料的硬度降低,摩擦因数和磨损率增大,点蚀和自腐蚀电位降低,自腐蚀电流密度增大,耐腐蚀性能变差。
TiB_(2)/4Cr13 steel composites with different mass fractions(0.6%,1.2%,1.8%)of TiB_(2) were prepared by mechanical ball milling and selective laser melting forming,and the effects of TiB_(2) content on the phase composition,microstructure,hardness,wear resistance and corrosion resistance of the composites were studied.The results show that the composite containedα-Fe,γ-Fe and TiB_(2) phases.With the increase of TiB_(2) content,the relative density of the composite decreased.When the mass fraction of TiB_(2) was 0.6%,the microstructure of the composite was the most fine and uniform.With the increase of the content of TiB_(2),the grain size increased,and cracks,micropores and other defects appeared in the microstructure.With the increase of TiB_(2) content,the hardness of the composites decreased,the friction coefficient and wear rate increased,the pitting and free-corrosion potential decreased,and the free-corrosion current density increased,indicating that the corrosion resistance decreased.
作者
张冬梅
李恒
邢峰
ZHANG Dongmei;LI Heng;XING Feng(Department of Electronic Engineering,Zhengzhou Professional Technical Institute of Electronics and Information,Zhengzhou 451450,China;School of Materials Science and Engineering,Zhengzhou University,Zhengzhou 450001,China)
出处
《机械工程材料》
CAS
CSCD
北大核心
2024年第1期66-73,共8页
Materials For Mechanical Engineering
基金
河南省科技攻关项目(212102210530)。
