中国激光, 2016, 43 (4): 0403009, 网络出版: 2016-03-29   

WC 含量对WC/Ni60A 激光熔覆层微观组织的影响 下载: 599次

Influence of WC Content on Microstructure of WC/Ni60A Laser Cladding Layer
作者单位
哈尔滨工业大学先进焊接与连接国家重点实验室, 黑龙江 哈尔滨 150001
摘要
激光熔覆镍基复合涂层在改善H13模具钢表面性能方面具有显著优势。在H13钢表面激光熔覆WC 质量分数分别为20%、33%、50%的WC/Ni60A 复合粉末,在优化工艺参数的基础上研究熔覆层的微观组织。研究发现,激光熔覆WC/Ni60A 复合涂层的相组成复杂。WC 的含量会显著影响熔覆层组织的生成及其形态。WC 质量分数为20%时,熔覆层由大量γ-(Fe, Ni)树枝晶和晶间富W 碳化物组成;WC 质量分数为33%时,熔覆层由大量的团絮状共晶组织组成,其中心为块状M23C6,周围为M23C6和γ-(Fe, Ni)组成的共晶组织,形态非常特殊;WC 质量分数为50%时,熔覆层中生成了大量块状M6C、雪花状M23C6 和针状Cr4Ni15W 组织。WC 质量分数分别为20%、33%、50%时,熔覆层的硬度相对于基体显著提高,分别达到了730、760、810 HV。
Abstract
Laser cladding of nickel-based composite layer is much helpful to improve surface properties of H13 steel. WC/Ni60A composite powder with WC mass fractions of 20%, 33% and 50% is respectively cladded on the H13 steel surface. Based on optimized parameters of laser cladding process, the microstructure of the cladding layer is studied. The results show that the phase composition of the laser cladded WC/Ni60A composite layer is complex. WC content has a significant effect on the formation and morphology of the cladding layer structure. When the mass fraction of WC is 20%, the cladding layer is composed of much γ-(Fe, Ni) branch crystal and a small amount of Wrich carbide; when the mass fraction of WC is 33%, the cladding layer, with a special structure, is composed of a large amount of flocculent eutectic structures which are concentrated by M23C6 blocks and surrounded by eutectic structure composed of M23C6 and γ- (Fe, Ni); when the mass fraction of WC is 50% , much block- shaped M6C, snowflake-shaped M23C6 and needle-like Cr4Ni15W structure is generated in the cladding layer. The hardness of the laser cladding layer increases remarkably compared with that of the substrate and is up to 730, 760, 810 HV, when the mass fraction of WC is 20%, 33% and 50%, respectively.

李福泉, 冯鑫友, 陈彦宾. WC 含量对WC/Ni60A 激光熔覆层微观组织的影响[J]. 中国激光, 2016, 43(4): 0403009. Li Fuquan, Feng Xinyou, Chen Yanbin. Influence of WC Content on Microstructure of WC/Ni60A Laser Cladding Layer[J]. Chinese Journal of Lasers, 2016, 43(4): 0403009.

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