冷轧辊用MC5锻钢的碳化物超细化工艺
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摘要
对轧辊用MC5钢试样采用高温固溶+高温回火以及高温固溶+低温奥氏体循环+高温回火两种不同热处理工艺处理后的显微组织及碳化物进行了观察,研究了高温固溶温度、奥氏体化温度以及奥氏体循环次数对MC5钢组织及碳化物转变的影响,研究结果表明,MC5钢试样采用1050℃×1 h高温固溶+840℃×0.5 h循环奥氏体化3次+740℃×6 h高温回火工艺处理后可获得最佳的碳化物细化及组织均匀化效果,碳化物平均尺寸可控制在0~0.5μm之间,且85%的碳化物尺寸在0~0.3μm之间。
Microstructure and carbides of MC5 steel sample were observed after high temperature solid solution + high temperature tempering process and high temperature solid solution + low temperature cyclic austenitizing + high temperature tempering process. The effects of solid solution temperature,austenitizing temperature and the number of cyclic austenitizing on microstructure and carbide transformation of the MC5 steel were studied. The results show that the preferable carbide refining process for MC5 steel is solid solution at 1050 ℃ for 1 h +austenitizing three times at 840 ℃ for 0. 5 h + tempering at 740 ℃ for 6 h. After this process,carbide dimension of the MC5 steel is between 0-0. 5 μm and the dimension of 85% carbides is 0-0. 3 μm.
Microstructure and carbides of MC5 steel sample were observed after high temperature solid solution + high temperature tempering process and high temperature solid solution + low temperature cyclic austenitizing + high temperature tempering process. The effects of solid solution temperature,austenitizing temperature and the number of cyclic austenitizing on microstructure and carbide transformation of the MC5 steel were studied. The results show that the preferable carbide refining process for MC5 steel is solid solution at 1050 ℃ for 1 h +austenitizing three times at 840 ℃ for 0. 5 h + tempering at 740 ℃ for 6 h. After this process,carbide dimension of the MC5 steel is between 0-0. 5 μm and the dimension of 85% carbides is 0-0. 3 μm.
引文
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