摘要
用药皮中添加稀土—强碳化物形成元素的工作焊条对9Cr2Mo钢轧辊辊面缺陷进行了冷焊修补。试验结果表明,熔敷金属的含碳量为0.55～0.6％,组织为低碳马氏体+弥散分布的粒块状碳化物。碳化物由(Nb、Ti)C、(Ti,V)C、(Fe,Cr)_3C、(Fe,Cr)_7C_3及(Fe,Cr)_(23)C_6组成,其尺寸在0.6～2.0μm之间。熔敷金属的硬度为HRC51～54,比辊面母材低10～15％,耐磨性与之相匹配。低碳马氏体改善了焊缝的韧性及抗裂性,大量弥散分布的粒块状碳化物是提高熔敷金属耐磨性的主要因素。
The surface defect on the surface of 9Cr2Mo steel rollers was repaired by cold welding with electrodes in which rare earth elements and strong carbide elements were added. The results indicated that the carbon content in weld metal was a 0. 55%~0. 60%,and the microstructure exhibited martensite and granular - lump carbides,which consisted of the phases of (Nb,Ti)C,(Ti,V)C,(Fe,Cr)3C,(Fe,Cr)7C3,and (Fe,Cr)23C6. The carbide size was in the range of 0. 6 and 2. 0μm.The weld metal hardness was HRC51 ~54,about 10%~15% lower than the surface hardness of roller material. The wear resistance of the weld melal was consistent with that of the roller material. Lath martensite could improve the toughness and cracking resistance of weld metal. Tt is believed that a large amount of granular - lump precipitation carbides is the main factor fof improving wear resistance.
出处
《物理测试》
CAS
1996年第6期1-4,共4页
Physics Examination and Testing
