Transactions of Materials and Heat Treatment

Title：Analysis on the influence of electromagnetic heat crack-arresting on cold forging steel mechanical properties

Authors： Sun Jiangong

Unit： Shaanxi University of Science and Technology

KeyWords： electromagnetic heat cold forging steel crack stress field mechanical properties

ClassificationCode：TG113

year,vol(issue):pagenumber：2015,40(12):145-149

Abstract：

For cold forging steel 45 with the buried circular crack, the electromagnetic heat crack-arrest process was numerically simulated, and the temperature fields, thermal stresses fields and the residual stress fields on the front of the crack were analyzed after crack-arresting. The results show that the metals are melted quickly on the front of the crack at the moment of crack-arresting, and the compressive stress field exists in the whole cooling process. This beneficial stress field has important practical meanings for preventing secondary crack from generating and propagation. The analysis on electromagnetic heat crack-arrest experiment shows that small and uniform dimples appear on the specimen fracture after quenching. Meanwhile the maximum tensile strength increases by 14.8% comparing with non-quenching specimen. Furthermore, the crack-arrest effect is inversely proportional to the size of crack under the same voltage, so it is improved obviously. Both the simulation and experiment prove that the electromagnetic heat crack-arrest technique can improve mechanical properties of cold forging steel effectively, and it also provides a reference for application in the future.

Funds：

作者简介：孙建功（1980-），男，硕士，讲师

Reference：

［1］徐看, 吕彦明, 黄艳玲.薄壁件锻造成形工艺及数值模拟技术研究[J]. 锻压技术, 2014, 39(2):128-131.Xu K, Lv Y M, Huang Y L. Research on forging process and numerical simulation technology of thin-walled parts[J]. Forging & Stamping Technology, 2014, 39(2):128-131.
［2］金城旭,任靖日,赵海龙. 偏心螺栓多工步冷锻过程中温度场仿真预测[J]. 机械科学与技术, 2014, 33(5):702-705.Jin C X, Ren J R, Zhao H L. Prediction of the temperature field in the multi-step cold forging of a camber bolt[J]. Mechanical Science and Technology for Aerospace Engineering, 2014, 33(5):702-705.
［3］程俊伟,李思忠,冯宪章,等.汽车滑动叉闭式模锻工艺研究[J]. 锻压技术, 2014, 39(1):21-24.Cheng J W, Li S Z, Feng X Z, et al. Study on closed die forging process for auto slide fork part[J]. Forging & Stamping Technology, 2014, 39(1):21-24.
［4］王德林, 陆有根, 吴兵温. 冷精锻复合成形技术应用及其发展趋势[J]. 热加工工艺, 2013, 42(5):107-110.Wang D L, Liu Y G, Wu B W. Application and development of warm-cold combined precision forging technology[J]. Hot Working Technology, 2013, 42(5):107-110.
［5］郑丽娟, 樊金开, 付宇明. 单边裂纹电磁热止裂的动力学效应[J]. 塑性工程学报，2015, 22(1):137-142.Zheng L J, Fan J K, Fu Y M. Dynamic effect analysis at the moment of crack arrest by electromagnetic heating in mental component with an edge crack[J]. Journal of Plasticity Engineering,2015, 22(1):137-142.
［6］刘思远, 白象忠, 刘俊杰, 等. 机械载荷作用下的单边裂纹电热止裂效应分析[J]. 科学技术与工程, 2004,4(10):825-829.Liu S Y, Bai X Z, Liu J J, et al. The analysis of crack arresting efficiency as a result of electrothermal effects under the mechanical load[J]. Science Technology and Engineering. 2004,4(10):825-829.
［7］白象忠, 胡宇, 谭文锋. 电磁热效应裂纹止裂研究的进展[J]. 力学进展, 2000, 30(4):546-557.Bai X Z, Hu Y, Tan W F. Advance of the study of crack prevention by the electromagnetic heat effect[J]. Advances in Mechanics, 2000, 30(4):546-557.
［8］刘文光, 陈国平. 含裂纹悬臂梁的振动与疲劳耦合分析[J]. 振动与冲击, 2011, 30(5):140-144.Liu W G, Chen G P. Coupling analysis for vibration and fatigue of a cracked cantilever beam[J]. Journal of Vibration And Shock, 2011, 30(5):140-144.
［9］李志鑫, 李小清, 陈学东, 等. 有限元分析中边界条件对模态影响的研究[J]. 中国机械工程, 2008, 19(9):1083-1086.Li Z X, Li X Q, Chen X D, et al. The study on boundary conditions to the effect of mode analysis in FEA[J]. China Mechanical Engineering, 2008, 19(9):1083-1086.
［10］郑丽娟, 周红梅, 刘会莹, 等. 含埋藏孔洞缺陷金属构件电磁热止裂强化分析[J]. 中国机械工程, 2012, 23(11):1285-1288.Zheng L J, Zhou H M, Liu H Y, et al. Anslysis on crack arresting and strengthening of metal structures with embedding hole defects by using electromagnetic heating[J]. China Mechanical Engineering, 2012, 23(11):1285-1288.
［11］付宇明,郑丽娟,白象忠.带有半埋藏空间裂纹的Cr12构件电磁热止裂分析[J].固体力学学报,2008,29(2):134-140.

Fu Y M,Zheng L J,Bai X Z. Analysis on crack arrest by electromanetic heating Cr12 components with spatially half-embedding cracks[J]. Chinese Journal of Solid Mechanics, 2008,29(2):134-140.

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