摘要
采用高速激光熔覆系统在破碎机锤头中常用的材料高锰钢表面制备了Ni60耐磨熔覆层。通过正交试验极差分析优化得到最佳工艺参数,采用渗透探伤、显微硬度计、OM,XRD,BSE和摩擦磨损试验对熔覆层宏观形貌、硬度、微观形貌、物相、摩擦系数和磨损量进行观察与测试。结果表明,当激光功率为1 200 W、扫描速度为4 mm/s、送粉速度为7.5 g/min时,熔覆层表面成形质量良好,表面硬度可达811.41 HV,约为基材的2.8倍,摩擦系数较基材下降37.7%,耐磨性提高1.6倍。熔覆层主要由γ-Ni树枝晶组成,其中弥散分布的硬质相CrB,Cr_(7)C_(3)和Cr_(23)C_(6)可显著提高熔覆层的耐磨性。
High-speed laser system was used to prepare Ni60 wear-resistant cladding layer on surface of high manganese steel that was commonly used in crusher hammer.The optimum process parameters were obtained by orthogonal test range analysis.The macroscopic morphology,hardness,microstructure,phase,friction coefficient and wear amount of cladding layer were observed and tested by penetration testing,microhardness tester,OM,XRD,BSE and friction and wear test.The results showed that when laser power was 1200 W,scanning speed was 4 mm/s,and powder feeding speed was 7.5 g/min,surface forming quality of cladding layer was good,surface hardness was 811.41 HV,which was about 2.8 times of substrate.Friction coefficient decreased by 37.7%compared with substrate and wear resistance was increased by 1.6 times.Cladding layer was mainly composed ofγ-Ni dendrites,in which hard phases CrB,Cr_(7)C_(6) and Cr_(23)C_(3) significantly improved wear resistance of cladding.
作者
史强
马欣
鲍思齐
高虹
黄勇
Shi Qiang;Ma Xin;Bao Siqi;Gao Hong;Huang Yong(Xinjiang Institute of Engineering,Urumqi 830023,China;Laser Intelligent Manufacturing and Remanufacturing Engineering Technology Research Center,Urumqi 830023,China)
出处
《焊接》
北大核心
2023年第11期39-45,共7页
Welding & Joining
基金
新疆维吾尔自治区重点研发计划项目(2022B01036-1)
新疆维吾尔自治区自然科学基金项目(2022D01B130)
新疆生产建设兵团第十二师重大科技项目(SR2022003)。
关键词
高速激光熔覆
高锰钢
Ni60合金粉末
正交试验
摩擦磨损
high-speed laser cladding
high manganese steel
Ni60 alloy powder
orthogonal test
frictional wear
