半导体激光熔覆新型Co基合金耐擦伤性机制

发布时间：2018-03-24 19:28

  本文选题：激光技术　切入点：激光熔覆　出处：《中国激光》2017年06期

【摘要】：在316不锈钢表面进行激光熔覆Stellite 3、Stellite 21与新型Co基合金(Co-3)试验,分析了熔覆层的显微组织及相成分,研究了硬度分布和耐擦伤机理。试验结果表明,Co-3显微组织均匀、致密,无裂纹与气孔,其强化相主要为(Co,W)_3C、Cr_(23)C_6、Cr_7C_3和Co_3Mo。熔覆层的平均显微硬度约为624HV_(0.2),较基体提高3倍以上。Co-3的耐擦伤性能明显优于316基体的,在载荷为0~150N的情况下,当划痕长度s≤3.3mm时,擦伤机理主要是塑性变形;当划痕长度3.3mms≤6.9mm时,擦伤机理主要是塑性变形引起的晶粒滑移与微裂纹形成;当划痕长度s6.9mm时,擦伤机理主要是裂纹扩展与塑性去除。
[Abstract]:The laser cladding of Stellite _ 3 / Stellite _ (21) and a new Co based alloy (Co _ (3)) were carried out on the surface of 316 stainless steel. The microstructure and phase composition of the coating were analyzed, and the hardness distribution and scratch resistance mechanism were studied. The results showed that the microstructure of the coating was uniform and compact. The strengthening phase of the cladding layer is mainly CoCoCW / C / C / C _ (23) C / C _ 6 / C _ (7) C _ (+) _ 3 and Co3Mo.The average microhardness of the cladding layer is about 624 HVV / 0.2n, which is more than 3 times than that of the substrate. The scratch resistance of Co-3 is obviously better than that of 316substrate. When the scratch length s 鈮，

本文编号：1659704