基于ProCAST的40CrNiMo金属型铸造微观组织分析
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摘要
以40CrNiMo多元合金的金属型铸造为研究对象,计算获得了40CrNiMo的形核和生长参数。基于ProCAST软件及CAFE模块,建立了40CrNiMo圆柱型棒料铸造充型和凝固组织演变有限元模型。对比分析了铸造工艺、浇注温度、浇注时间、换热系数和冷却介质等工艺条件对凝固缺陷和微观组织的影响。结果表明,金属型铸件相对砂型铸件的整体组织更致密、晶粒更细小。金属型铸造时,采取较低的浇注温度、较大的换热系数和激冷能力较强的冷却介质,铸件的缩松和缩孔缺陷相对较少且微观组织相对致密。
The research object of this paper is metal mold casting of 40 CrNiMo multi-component alloy. The nucleation and growth parameters of 40 CrNiMo alloy were calculated. The finite element models of casting filling and solidification microstructure evolution of 40 CrNiMo cylindrical bar were established basing on the ProCAST software and CAFE module. The influence of casting process, pouring temperature, pouring time, heat transfer coefficient and cooling medium on solidification defect and microstructure were comparatively analyzed. The results indicate that the metal mold has greater chilling ability than sand mold, so the overall structure of the casting is more compact and the grain is smaller. When the casting was produced using a metal mold, low pouring temperature, higher heat transfer coefficient and cooling medium with stronger chilling ability, the shrinkage cavity and porosity of casting is less and microstructure is compact relatively.
The research object of this paper is metal mold casting of 40 CrNiMo multi-component alloy. The nucleation and growth parameters of 40 CrNiMo alloy were calculated. The finite element models of casting filling and solidification microstructure evolution of 40 CrNiMo cylindrical bar were established basing on the ProCAST software and CAFE module. The influence of casting process, pouring temperature, pouring time, heat transfer coefficient and cooling medium on solidification defect and microstructure were comparatively analyzed. The results indicate that the metal mold has greater chilling ability than sand mold, so the overall structure of the casting is more compact and the grain is smaller. When the casting was produced using a metal mold, low pouring temperature, higher heat transfer coefficient and cooling medium with stronger chilling ability, the shrinkage cavity and porosity of casting is less and microstructure is compact relatively.
引文
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[2]MANG T.Encyclopedia of lubricants and lubrication[M].Berlin:Springer,2014.
[3]FORSUND V K.Das eindringen von stahl in form sand einflub der oberflachen reaction under temperatur[J].Giesserei Techn.Wiss.Beih,1962,14(2):51-61.
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[5]廖敦明,曹流,孙飞,等.铸造宏观过程数值模拟技术的研究现状与展望[J].金属学报,2018,54(2):161-173.
[6]陈瑞,许庆彦,郭会廷,等.Al-7Si-Mg铸造铝合金凝固和热处理过程微观组织模拟和屈服强度预测[J].稀有金属,2017,41(8):837-849.
[7]邵珩,李岩,南海,等.Ti-6Al-4V合金熔模铸造过程中的固态相变微观组织演变的数值模拟[J].金属学报,2017,53(9):1140-1152.
[8]SHEPEL S V,PAOLUCCI S.Numerical simulation of filling and solidification of permanent mold castings[J].Applied Thermal Engineering,2002,22(2):229-248.
[9]CHANG Q M,YANG Y K,YUAN J,et al.Numerical simulation of mold filling and solidification behavior in permanente casting process[J].Applied Mechanics&Materials,2013,313-314:179-183.
[10]王同敏,魏晶晶,王旭东,等.合金凝固组织微观模拟研究进展与应用[J].金属学报,2018,54(2):193-203.
[11]JING C L,XU Z G,WANG Y,et al.Simulation on solidification structure of 72A tire cord steel billet using CAFE method[J].China Foundry,2012,9(1):53-59.
[12]闵义,刘承军,王德永,等.37Mn5连铸圆坯中心等轴晶率预测[J].钢铁研究学报,2011,23(10):38-43.
[13]王金龙,赖朝彬,王福明,等.CAEF模型机理及应用[J].钢铁研究学报,2009,21(10):60-63.
[14]王金龙.基于CAFE法模拟自然对流对微观组织的影响[J].材料导报,2017,31:474-478.
[15]王金龙,王福明,李长荣,等.易切削钢9SMn28凝固过程的CAFE法模拟[J].北京科技大学学报,2010,34(3):325-330.
[16]庞瑞朋,王福明,王金龙,等.3D-CAFE法凝固参数对430不锈钢凝固组织的影响[J].材料热处理学报,2013,34(12):188-195.