依照非晶形成能力的三判据原则及非晶成分团簇线定律法则, 选取在常规非晶合金制备过程中呈现较强非晶形成能力的Ni60Zr20Nb15Al5合金成分, 研究其在不同激光功率条件 下在45#钢表面得到的熔覆层的微观组织和力学及腐蚀性能. 结果表明: 熔覆涂层由熔覆层、结合区和热影响区组成, 物相包括非晶相及Al3Zr5、Al3Nb11Ni9、Al2O3等晶体相; 当功率为3600 W时, 熔覆层表面硬度高, 达到HK1796.4, 涂层耐蚀性最好, 致钝电流密度和维钝电流密度都达到最小, 分别为3.0669 mA/cm2和0.2556 mA/cm2.
According to the criteria for forming ability and the law of cluster line of amorphous composition, an alloy of Ni60Zr20Nb15Al5, which has a great glass-forming ability (GFA) in preparation by conventional methods, was chosen to prepare coatings on 45 carbon steel surface by laser cladding. The microstructure, mechanical and corrosion property of the coatings prepared with different laser power were studied. The results showed that the clad coating could be differentiated in a clad zone, a transition zone and a heat-affected zone, and it was consisted of amorphous phase and crystalline phases such as Al3Zr5、Al3Nb11Ni9 and Al2O3. With a laser power 3600 W the surface of clad coating exhibited the highest hardness up to HK1796.4, the best corrosion resistance and the lowest passivation current density 0.2556 mA/cm2.
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