CAJ | 학술논문

铸造表面合金化工艺制备的合金层存在着硬度高,机械加工困难及合金层与基体结合强度较低而易剥落的缺陷,该研究针对这些缺陷进行研究,采用梯度成分设计原则,制备出不同组分及含量的梯度合金粉剂层膏块,在HT200铸铁件表面制各出硼化物梯度耐磨材料,对该材料的形成过程、微观组织及显微硬度进行了研究,发现该合金层由过渡区→中间耐磨层→表面铸铁烧结层3部分组成,中间层的微观组织为硼化物,其基体上散布着高碳铬铁颗粒,且颗粒粒径影响其与梯度材料的熔合性,并在实际农机铸铁件犁锺上进行了现场应用,结果表明,与未处理零件相比,犁锺使用寿命提高2.5倍以上.
주조표면합금화공예제비적합금층존재착경도고,궤계가공곤난급합금층여기체결합강도교저이역박락적결함,해연구침대저사결함진행연구,채용제도성분설계원칙,제비출불동조분급함량적제도합금분제층고괴,재HT200주철건표면제각출붕화물제도내마재료,대해재료적형성과정、미관조직급현미경도진행료연구,발현해합금층유과도구→중간내마층→표면주철소결층3부분조성,중간층적미관조직위붕화물,기기체상산포착고탄락철과립,차과립립경영향기여제도재료적용합성,병재실제농궤주철건리종상진행료현장응용,결과표명,여미처리령건상비,리종사용수명제고2.5배이상.
The wear-resisting alloying layer on casting surface can be prepared by the surface alloying technique. However, the layer has obvious defects such as high hardness leading to difficultly machining, easily spalling became of low bonding strength between layer and matrix. Aimed at solving the problems, the blocks coated by different component of gradient powder layers using the principle of gradient composite design were prepared. Then wear-resisting functional gradient borides materials (FGMs) on HT200 cast iron's surface were formed, and their forming mechanism, microstructure and microhardness were studied. The results showed that the alloying layers were made up of transition region, middle wear-resisting layer and ingot particles sintering layer. Further study on the mierostructure of middle wear-resisting layer indicated that high-hardness ferrochrome particles homogeneously scattered on the boride matrix, which its size affected the fusion of the materials. Application in slade showed that the service life of treated slade was increased more than 2.5 times comparing with that of untreated slade.