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采用正交试验方法,研究了热处理工艺参数对低碳高铬白口铸铁组织与力学性能的影响,并优化了热处理工艺参数。研究结果表明,在本试验温度范围内,热处理各参数对低碳高铬白口铸铁硬度的影响主次顺序依次为淬火保温时间、淬火温度、回火保温时间、回火温度;对冲击韧性的影响主次顺序依次为回火保温时间、淬火温度、淬火保温时间、回火温度。经优化热处理工艺1010℃×5 h淬火+砂冷,400℃×5 h回火+砂冷处理后,低碳高铬白口铸铁的硬度和冲击韧度得到较好的匹配,其值分别为55.2 HRC和4.9 J/cm2,组织主要由马氏体、断续分布的共晶碳化物、细小弥散分布的二次碳化物和少量残留奥氏体组成。
The effects of heat treatment process parameters on the microstructure and mechanical properties of low carbon high chromium white cast iron were studied by orthogonal test. The parameters of heat treatment were optimized. The results show that the order of quenching holding time, quenching temperature, tempering holding time and tempering temperature are the main order of the influence of heat treatment parameters on the hardness of low-carbon high-chromium white cast iron in this test temperature range; Affect the primary and secondary sequence followed by tempering holding time, quenching temperature, quenching holding time, tempering temperature. The optimal heat treatment process 1010 ℃ × 5h quenching + sand cooling, 400 ℃ × 5h tempering + sand cooling treatment, the hardness and impact toughness of low-carbon high-chromium white cast iron get a good match, the values were 55.2 HRC and 4.9 J / cm2. The microstructure consists of martensite, intermittent eutectic carbide, finely dispersed secondary carbides and a small amount of retained austenite.