材料期刊网

目的：改善Q235钢板的耐磨性,以取代65 Mn在振动筛筛板中的应用。方法采用电阻丝加热非真空熔覆技术,在氩气保护条件下于Q235钢表面制备碳化钨/镍基合金复合熔覆层。通过SEM 和XRD观察分析熔覆层与基体的结合方式、碳化钨分布、熔覆层组织及相组成,通过硬度测试及磨损试验,分析碳化钨对熔覆层耐磨性的影响。结果熔覆层与钢基体达到冶金结合。熔覆层主要由奥氏体、碳化钨、碳化物及硼碳复合化合物等相组成,碳化钨弥散分布其中。当碳化钨用量为熔覆粉末总质量的35%时,熔覆层硬度为47.3HRC,磨损率为0.08 mg/m,约是钢基体耐磨性的5倍,65Mn耐磨性的4倍。结论采用氩气保护制备的碳化钨熔覆层与基体结合良好,提高了钢基体的耐磨性。

ABSTRACT:Objective To improve the wear resistance of Q235 steel sheet, and to replace the application of 65Mn in the sieve plate of shaker screen. Methods Tungsten carbide/Nickle-based alloy composite cladding layer was prepared on the surface of Q235 steel plate under the protection of argon gas by resistance wire heating non-vacuum cladding technique. SEM and XRD were used to observe and analyze the combination mode of the cladding layer and the substrate, tungsten carbide distribution, the organi-zation of cladding layer and the phase composition, meanwhile, the Rockwell hardness tester and wear tester were used to test the rock hardness and the wear rate of cladding layer, and analyze the effect of tungsten carbide on the wear resistance of the cladding layer. Results The steel substrate and the cladding layer achieved metallurgical bonding, and the microstructure of the cladding layer mainly consisted of binding phase, tungsten carbide, carbide and boron carbon composite compounds, where the distribution of tungsten carbide was well-proportioned in the cladding layer. With 35% WC content in the cladding layer alloy powder, its rock hardness reached 47. 3HRC and the wear rate was 0. 08 mg/m, which was 5 folds higher than the wear resistance of the steel sub-strate and 4 folds higher than that of 65Mn. Conclusion The tungsten carbide composite cladding layer prepared with argon gas pro-tection was well bonded with the steel substrate and improved the wear resistance of the steel substrate.