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),M_7C_3和M_(23)C_6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M_7C_3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 microstructure and properties of Fe901/3%Cu laser clad coating were investigated by means of optical microscope, scanning electron microscopy (SEM), X-ray diffraction (XRD), transmission electron microscopy (TEM), and sliding wear teat. It is found that α-Fe (martensite) is presented accompanied by M_7C_3 and M_(23)C_6 in the as-clad coating. The preferred direction at (110)crystal plane exists in the α-Fe matrix. TEM observation shows that high density dislocations exist in the martensite. The dislocations distribute in the direction from substrate to clad coating. The dispersed Cr-rich carbide and ε-Cu precipitate from martensite when the clad coating is aged at 500℃ for 35h. The microhardness and wear resistance increase greatly after the aging treatment.
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