氩弧重熔Q235钢B-C-N共渗层的组织结构及耐磨性

Microstructure and wear resistance of boron-carbonitrided layer on Q235 steel by argon arc remelting

采用粉末包埋法对Q235钢进行B-C-N共渗,并对共渗层进行氩弧重熔。观察共渗层和熔覆层的显微组织并进行结构分析,测试共渗层及熔覆层的显微硬度和耐磨性。结果表明,共渗层的显微组织由Fe B、Fe2B、Fe3B、Fe2N、Fe8N和Fe3C相组成,氩弧重熔层形成了新相Fe23(B,C)6和Fe3N等;共渗层显微硬度最高值为1198.4 HV0.1,重熔层的最高硬度值为1192.8 HV0.1,但硬度梯度变化平缓;共渗层、氩弧重熔层相对基体的耐磨粒磨损性能分别为2.77、3.76倍;共渗层、氩弧重熔层相对基体的耐粘着磨损性能分别为1.95、3.23倍,摩擦因数分别为0.502、0.462,较基体均有所下降。

Boron-carbonitrided layer was prepared on Q235 steel using powder imbedding method, and remelted by argon arc. Microstructure of the boron-carbonitrided layer before and after remelting was observed and analysis, the mierohardness and wear resistance were tested. The resuhs show that the microstructure of the boride layer is composed of FeB, Fe2B, Fe3B, Fe2N, FesN and Fe3C, and the remehed one generates some new phases Fe23 （B, C）6, Fe3N and so on; The highest mierohardness value of the boride layer is 1198.4 HV0. 1, the remelted one is 1192.8 HV0.1 and the hardness gradient becomes gently; Compared with the substrate, the relative abrasive wear resistances of the boride layer and the remelted layer are 2.77 and 3.76 times, respectively, the relative adhesive wear resistances of the boride layer and the remelted layer are 1.95 and 3.23 times respectively ; The friction coefficients of the boride layer and the remehed layer are 0. 502 and 0. 462, respectively, these all decrease compared to the matrix.