B_(4)C添加量对42CrMo钢表面Stellite6+B_(4)C激光熔覆层形貌与性能的影响  

Effect of B_(4)C addition on morphology and properties of Stellite6+B_(4)C laser clad layers on 42CrMo steel surface

作　　者：张泽疆 李新梅[1] 朱春金 李航 杨定力 Zhang Zejiang;Li Xinmei;Zhu Chunjin;Li Hang;Yang Dingli(College of Mechanical Engineering,Xinjiang University,Urumqi Xinjiang 830017,China)

机构地区：[1]新疆大学机械工程学院,新疆乌鲁木齐830017

出　　处：《金属热处理》2024年第7期200-208,共9页Heat Treatment of Metals

基　　金：国家自然科学基金(52161017);新疆维吾尔自治区自然科学基金(2022D01C386)。

摘　　要：针对采煤机截齿表面改性问题,利用X射线衍射仪、扫描电镜、维氏显微硬度计、多功能摩擦磨损试验机和电化学工作站研究了不同B_(4)C添加量(3%、5%、7%)对42CrMo钢表面激光熔覆Stellite6+B_(4)C熔覆层截面形貌、显微硬度、耐磨性及耐腐蚀性的影响。结果表明:当B_(4)C添加量为3%和5%时,熔覆层截面形貌较好,当B_(4)C添加量为7%时,熔覆层表面出现较多缺陷。随着B_(4)C添加量的提升,熔覆层显微硬度从781.04 HV提升到1044.72 HV,平均摩擦因数下降,磨损量先减小后增大。当B_(4)C添加量为7%时,熔覆层平均摩擦因数为0.42,但由于其成形质量较差,导致其磨损量较高,为1.9 mg,当B_(4)C添加量为5%时,熔覆层磨损量最小,为0.6 mg。熔覆层的耐腐蚀性随B_(4)C添加量的增加先增强后降低,当B_(4)C添加量为5%时,熔覆层的自腐蚀电位最高,自腐蚀电流密度最小,电荷转移电阻R_(ct)最大,熔覆层的耐腐蚀性最好。In view of the surface modification of shearer picks,effect of B_(4)C addition(3%,5%and 7%)on the cross-section morphology,microhardness,wear resistance and corrosion resistance of the Stellite6+B_(4)C laser clad layers on 42CrMo steel was studied by means of X-ray diffractometer,scanning electron microscope,Vickers microhardness tester,multifunctional friction and wear testing machine and electrochemical workstation.The results show that the cross-section morphology of the clad layer is good when the B_(4)C addition is 3% and 5%,however,when the B_(4)C addition is 7%,there are many defects on the surface of the clad layer.With the increase of B_(4)C addition,the microhardness of the clad layer increases from 781.04 HV to 1044.72 HV,the average friction coefficient decreases and the wear loss decreases first and then increases.When the B_(4)C addition is 7%,the average friction coefficient of the clad layer is 0.42,but due to the poor forming quality,the wear loss is the highest as 1.9 mg.When the B_(4)C addition is 5%,the wear loss is the least as 0.6 mg.The corrosion resistance of the clad layer first increases and then decreases with the increase of B_(4)C addition.When the B_(4)C addition is 5%,the self-corrosion potential of the clad layer is the highest,the self-corrosion current density is the smallest,and the charge transfer resistanceR_(ct)is the largest,the best corrosion resistance of the clad layer is obtained.

关 键 词：采煤机截齿 激光熔覆 Stellite6+B_(4)C熔覆层 耐磨性 耐腐蚀性 

分 类 号：TG178.1[金属学及工艺—金属表面处理]