在本文中,在AISI304奥氏体不锈钢上通过感应加热和充填渗铬制备了Cr涂层。然后,引入冷轧变形和退火处理,以细化由包渗铬引起的粗大基体晶粒,提高304奥氏体不锈钢的综合性能。相组成,元素分布,并仔细表征了涂层的微观结构。显微硬度,耐磨性,并对涂层的耐腐蚀性能进行了测试。结果表明,厚度为100μm的Cr涂层主要由一种(Cr,Fe)23C6,(Cr,Fe)7C3和α-Fe-Cr固溶体。经过冷轧变形和随后的退火处理,晶粒显著细化,Cr涂层分为两层,由碳铬化合物组成,如Cr23C6、Cr7C3、Cr2C、表面层中的Cr3C2和亚表面层中的Fe-Cr固溶体。冷轧变形和退火处理显著提高了涂层试样的显微硬度和耐磨性,耐腐蚀性也优于未涂覆样品。
In this paper, a Cr coating was prepared by induction heating and pack-cementation chromizing on AISI 304 austenitic stainless steel. Then, the cold-rolling deformation and
annealing treatment were introduced to refine the coarse matrix grains caused by pack-chromizing and improve the overall performance of 304 austenitic stainless steel. The phase composition, element distribution, and microstructure of the coating were carefully characterized. The microhardness, wear resistance, and corrosion resistance of the coating were tested. The results show that the Cr coating with a thickness of 100 μm is mainly composed of a (Cr,Fe)23C6, (Cr,Fe)7C3, and α-Fe-Cr solid solution. After the cold-rolling deformation and subsequent
annealing treatment, the grains are significantly refined and the Cr coating is divided into two layers, consisting of carbon-chromium compounds such as Cr23C6, Cr7C3, Cr2C, and Cr3C2 in the surface layer and a Fe-Cr solid solution in the subsurface layer. The cold-rolling deformation and
annealing treatment significantly improved the microhardness and wear resistance of the coated sample, and the corrosion resistance was also better than that of the uncoated sample.