Effect of Heat Treatment Process on Liquid-precipitated Carbides in MC5D roller Blank for Cold-rolling Application
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摘要: 主要研究热处理工艺对MC5D冷轧辊坯料液析碳化物的影响,首先采用JMatoPro软件计算MC5D冷轧辊钢在平衡状态下的相变和碳化物类型,并使用扫描电镜对实物进行检测,然后通过超高温共聚焦显微镜观察液析碳化物随热处理工艺变化的全过程。结果表明:MC5D冷轧辊坯中的液析碳化物类型主要为M7C3型。该钢种中的液析碳化物在765℃左右开始溶入基体,并在加热温度到达1 000℃时基本消失,只有少量未溶入基体的碳化物一直到1 252℃时随着液析碳化物附近周围的基体发生熔化后才消失。根据超高温共聚焦显微镜观察的结果,设计热处理工艺为“1 050℃,加热1 h,出炉油冷”及“1 070℃,加热1 h,出炉油冷”两组试验,液析碳化物级别均由4.0级降低至0.5级,结果证明了该热处理工艺的可行性。Abstract: In this paper,the effect of heat treatment process on liquid-precipitated carbides in MC5D cold-rolling roller blank was investigated.The phase transformation and type of carbides in MC5D steel at equilibrium state were calculated by JMatoPro software,and the microstructure of the blank was observed by scanning electron microscopy.And the transition of liquid-precipitated carbides during the heating process was analyzed by ultra-high temperature confocal microscopy.The results show that the liquid-precipitated carbides in MC5D blank are mainly M7C3,which start to dissolve into the matrix at about 765℃.The liquid-precipitated carbides can be almost dissolved into the matrix when the heating temperature reaches 1 000℃,but a small amount of carbides still exist until the temperature reaches 1 252℃ where the matrix around the carbides starts to melt.Based on the analysis results of ultra-high temperature confocal microscopy,two sets of heat treatment process were designed,including "heating at 1 050℃ for 1 h,oil cooling" and "heating at 1 070℃ for 1 h,oil cooling".By implementing these twosets of heat treatment,the level of liquid-precipitated carbides can be reduced from 4.0 to 0.5,which proves the feasibility of the designed heat treatment processes.
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