V／Nb对电弧喷涂马氏体不锈钢合金涂层组织和性能的影响

Effects of V /Nb on Microstructure and Properties of Arc Sprayed Martensitic Stainless Steel Alloy Coatings

目的研究添加V和Nb对电弧喷涂马氏体不锈钢合金层组织和性能的影响规律。方法研制不同V和Nb含量的新型马氏体不锈钢电弧喷涂药芯丝材,利用高速电弧喷涂设备在Q235低碳钢板表面制备耐磨合金涂层,并对合金涂层的组织结构和性能进行研究。结果所制备的合金涂层成形良好,孔隙率较低,结构致密;涂层显微硬度值达523HV0.1,与基材间的平均结合强度值达35.48 MPa,V和Nb的添加提高了合金涂层的耐磨损性能。结论添加适量的V和Nb合金元素,可以促进碳化物硬质相颗粒的形成,提高马氏体不锈钢合金涂层的综合性能。

Objective To study effects of V and Nb on microstructure and properties of arc sprayed martensitie stainless steel alloy. Methods New are sprayed martensitie stainless steel flux-cored wires with different amount of V/Nb were developed, and the wear resistant alloy coatings were prepared on the surface of the Q235 low-carbon steel by HAVS using the wire. The mierostrueture and properties of the alloy coatings were detected and analyzed by using the equipment such as SEM, XRD, mierohardness tester and wear tester. Results The coatings had good forming properties, less porosity, uniformity of mierostrueture and compact structure. The average value of adhesion strength was about 35.48 MPa. The average mierohardness value was about 523HV0.1, which was higher than that of 4Cr13 coatings, and the abrasive wear resistance was enhanced with the additional use of elements V and Nb. Conclusion V/Nb could improve the forming of carbide hard phase particles in the coatings and enhance the performance of the al- loy coatings.