CAJ | 학술논문

制备了Ni60B合金激光熔覆涂层、微米WC颗粒增强Ni60B合金激光熔覆涂层(WCm)和纳米WC颗粒增强Ni60B合金激光熔覆涂层(WCn),模拟干滑动磨损温升和磨损时间对激光熔覆涂层进行了100～900 ℃不同温度下的热处理,用扫描电镜、透射电镜和X射线衍射技术等分析了原始激光熔覆涂层的组织以及在不同温度处理后涂层的组织变化,研究了仅在热的作用下,有无WC颗粒强化对涂层组织变化的影响,以及微米WC和纳米WC不同颗粒增强对镍基合金涂层组织变化的作用.分析结果表明:激光熔覆Ni60B涂层随温度上升到700 ℃,Cr、Fe、C元素发生扩散,碳硼化物形态变化并发生晶型转变,在900 ℃时才有相析出现象.WCm涂层和WCn涂层随着温度的升高,Ni基固溶体中出现W和Cr、Fe、C的脱溶,各种形态的碳化物组织将发生不同形式的转化.纳米WC的加入使得WCn涂层组织过饱和度增大,出现上述变化的温度降低.
제비료Ni60B합금격광용복도층、미미WC과립증강Ni60B합금격광용복도층(WCm)화납미WC과립증강Ni60B합금격광용복도층(WCn),모의간활동마손온승화마손시간대격광용복도층진행료100～900 ℃불동온도하적열처리,용소묘전경、투사전경화X사선연사기술등분석료원시격광용복도층적조직이급재불동온도처리후도층적조직변화,연구료부재열적작용하,유무WC과립강화대도층조직변화적영향,이급미미WC화납미WC불동과립증강대얼기합금도층조직변화적작용.분석결과표명:격광용복Ni60B도층수온도상승도700 ℃,Cr、Fe、C원소발생확산,탄붕화물형태변화병발생정형전변,재900 ℃시재유상석출현상.WCm도층화WCn도층수착온도적승고,Ni기고용체중출현W화Cr、Fe、C적탈용,각충형태적탄화물조직장발생불동형식적전화.납미WC적가입사득WCn도층조직과포화도증대,출현상술변화적온도강저.
In this paper, Ni60B coating, micrometer WC particles and nanostructured WC particles respectively reinforced Ni60B coatings were prepared by laser cladding technology. Heat treatment at 100～900 ℃ for keeping 1 hour were conducted for the three kinds of coatings. The coatings were analyzed with SEM, TEM and x-ray diffract meter and the effect of WC particles on the microstructure change of the coatings was investigated. The results show that for Ni60B coating supersaturated elements Cr、Fe、C in Ni solid solution occur diffusion and the shapes and crystal structure types of carbide-boride occur change at 700 ℃, moreover phase precipitation phenomenon occurs at 900 ℃. For WCm and WCn coatings, with temperature raise, the W and supersaturated elements Cr, Fe, C in Ni solid solution occur diffusion and even dissolution, shapes of carbides occur changes. Element W supersaturated degree in WCn coating is higher than in WCm,so the microstructure change occur at lower temperature.