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首页> 外文期刊>Advanced Science Letters >Microstructure and Wear Property on Fine WC-6.5%Co and Super Hard Alloy Cladding Layer by Electric Resistance Welding
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Microstructure and Wear Property on Fine WC-6.5%Co and Super Hard Alloy Cladding Layer by Electric Resistance Welding

机译：WC-6.5％Co和超硬合金熔覆层电阻焊的组织与磨损性能

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摘要

The WC-6.5% Co and SHA (Super Hard Alloy) cladding layer was formed on the SPCC plate by electric resistance welding and investigated the microstructure with wear behavior. It was found that the WC-6.5Co cladding layer exhibited compact microstructure with rare defect due to the meted solidification of SHA by electrical joule's heat. Also, the abrasive wear resistance of the cladding layer was significantly improved as compared with fundamental welding structural steel. This study deals with characterizations of microstructure and wear performance of a cladding layer consisted of composite metal powder of fine WC-6.5%Co and Super Hardness Alloy (SHA) by the electric resistance welding. The cladding layer with two different matrixes was observed by using SEM and EPMA. The main matrix was semi-sintered structure which had been bonded with fine WC particles, binder phase of Co and melted SHA by joule heat generation. The other was the imperfect melted SHA surrounded the main matrix. The hardness of main matrix was between 1010 and 1100 HV. The hardness of imperfect melted SHA was between 600 and 670 HV. The rubber wheel abrasion test had been carried out with using silica in dry environment. Also the abrasion test for fundamental welding structure steel (SM490) and D2 under the same wear conditions was performed to confirm the significant improvement of wear performance of the cladding layer. From results of abrasion test, it was found that wear volume showed linearly increase with the increase in an abrasion load, but wear volumes were hardly changed as abrasion speed was increased for all specimens of SM490 and the cladding layer D2. In comparison by wear rate, the cladding layer showed the superior wear performance that was 15 times of SM490 and about 62% of D2. The wear mechanism of SHA was observed as indentation and sliding cutting of abrasion particles, and main matrix were found the intergranular fracture by removal of the binder phase which in turn causes undermining of WC particles and hence, ploughing out of WC particles.
机译：通过电阻焊在SPCC板上形成WC-6.5％Co和SHA（超硬合金）熔覆层，并研究了具有磨损行为的显微组织。结果发现，由于电焦耳热使SHA固化，WC-6.5Co熔覆层表现出致密的微观结构，且缺陷很少。另外，与基础焊接结构钢相比，覆层的耐磨性显着提高。本研究通过电阻焊对WC-6.5％Co细金属复合粉末和超硬合金（SHA）组成的熔覆层的组织和磨损性能进行表征。通过使用SEM和EPMA观察到具有两种不同基质的包覆层。主要基质是半烧结结构，通过焦耳热产生，该结构已与细小的WC颗粒，Co的粘结相和熔融的SHA结合在一起。另一个是不完全熔化的SHA围绕主基质。主基质的硬度在1010至1100 HV之间。不完全熔融的SHA的硬度在600到670 HV之间。橡胶轮的磨损试验是在干燥环境下使用二氧化硅进行的。在相同的磨损条件下，还对基础焊接结构钢（SM490）和D2进行了磨损测试，以确认包覆层的磨损性能得到了显着改善。从磨损试验的结果发现，磨损量随着磨损负荷的增加而线性增加，但是对于所有SM490和包层D2的试样，磨损量几乎没有随着磨损速度的增加而改变。通过磨损率比较，覆层显示出优异的磨损性能，是SM490的15倍和D2的约62％。观察到SHA的磨损机理是磨损颗粒的压痕和滑动切割，并且通过除去粘合剂相发现了主基体的晶间断裂，这反过来导致WC颗粒的破坏，因此从WC颗粒中犁出。

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