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采用光学显微镜、扫描电镜、X射线衍射、透射电镜以及滑动磨损实验,研究了500℃时效35h处理对激光熔覆Fe901/3%Cu涂层组织结构及性能的影响。结果表明,未经过时效处理的熔覆层主要是由α-Fe(马氏体),M7C3和M23C6构成,并且α-Fe存在(110)晶面的择优取向,在马氏体上分布着高密度的位错,而且位错沿着熔覆基材向熔覆层方向延伸分布。熔覆层经过500℃时效35h以后,熔覆层中富铬碳化物相的相对含量有所增加,并且沿M7C3相由马氏体中析出弥散分布的ε-Cu颗粒,在ε-Cu颗粒附近分布有若干位错,对位错起钉扎作用。熔覆层在时效以后的剖面显微硬度和表面耐磨性能显著提高。
The effects of aging at 500 ℃ for 35h on the microstructure and properties of laser cladding Fe901 / 3% Cu coating were studied by optical microscope, scanning electron microscopy, X-ray diffraction, transmission electron microscopy and sliding wear test. The results show that the cladding layer without aging is mainly composed of α-Fe (martensite), M7C3 and M23C6, and the preferred orientation of (110) plane exists in α-Fe. The martensite distributes high Density of dislocations, and dislocations along the cladding substrate extending toward the cladding direction. After 35h aging at 500 ℃, the relative content of Cr-rich carbide phase in the cladding layer increased, and the ε-Cu particles dispersed in the martensite along the M7C3 phase distributed around the ε-Cu particles There are a number of dislocations that act as a pinnacle to dislocations. Cladding layer after aging in the micro-hardness and surface wear resistance significantly improved.