Analysis on Phase Transformation Stress after Pulse Current Discharging of  Metal Component with Buried Crack

Abstract

Abstract:

The circular buried crack of 40CrNiMo steel was arrested and strengthened by pulse discharging experiments. Comparative analysis with the changes in the macroscopic morphology, chemical composition and microhardness near the crack tip before and after the discharge was performed. Experimental results show that the microstructure and micro-hardness of transformation zone are improved greatly. The theoretical formula of phase transformation stress around crack tip is deduced using transient heat conduction equations, phase transformation kinetics and Eshelby equivalent inclusion. The compressive stress is generated in phase transformation zone, proving that electromagnetic heating effect plays a part in inhibiting crack propagation.

Key words: pulse discharge, phase transformation stress field, crack arrest strengthening, equivalent inclusion, embedding crack

摘要：

对带有圆形埋藏裂纹的40CrNiMo金属构件进行了脉冲放电止裂强化实验。通过对脉冲放电后裂纹尖端的宏观形貌、相变区域与基体区的化学成分及显微硬度进行对比分析,发现相变区的组织得到了细化,其显微硬度得到大幅度提高;应用含有热源的非齐次非稳态热传导方程、相变动力学及等效夹杂等理论推导出了裂尖相变区域的相变应力理论公式。结果表明,裂尖附近相变区域形成了相变压应力,验证了电磁热效应对埋藏裂纹的扩展起到抑制作用。

关键词: 脉冲放电, 相变应力场, 止裂强化, 等效夹杂, 埋藏裂纹

CLC Number:

Fu Yuming, Wang Junli, Zheng Lijuan. Analysis on Phase Transformation Stress after Pulse Current Discharging of Metal Component with Buried Crack[J]. China Mechanical Engineering, 2014, 25(8): 1117-1121.

付宇明, 王俊丽, 郑丽娟. 含埋藏裂纹构件脉冲放电相变应力分析[J]. 中国机械工程, 2014, 25(8): 1117-1121.

References

[1]王平,白象忠.电热止裂相变应力及其对止裂效果的影响[J].中国机械工程,2011,22(4):980-982.
Wang Ping,Bai Xiangzhong.Phase Transformation Stress and Its Influence for Arresting Crack Propagation Using Electro-heating Effect[J]. China Mechanical Engineering,2011,22(4):980-982.
[2]Deng Dean,Murakawa Hidekazu.Prediction of Welding Residual Stress in Multi-pass Butt-welded Modified 9Cr-1Mo Steel Pipe Considering Phase Transformation Effects[J].Computational Materials Science,2006,37(3):209-219.
[3]Lee Chin-Hyung,Chang Kyong-Ho.Prediction of Residual Stresses in High Strength Carbon Steel Pipe Weld Considering Solid-state Phase Transformation Effects[J].Computers and Structures,2011,16(7):256-265.
[4]付宇明,郑丽娟,刘禹.含半埋藏空间裂纹的Cr12冷冲凹模电磁热止裂分析[J].中国机械工程,2008,19(10)：1224-1227.
Fu Yuming,Zheng Lijuan,Liu Yu.Analysis on the Crack Arrest in Cr12 Cold Punch Cavity Die with Half-embedding Spatial Crack by Using Electromagnetic Heating[J].China Mechanical Engineering,2008,19(10):1224-1227.
[5]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 Lijuan,Zhou Hongmei,Liu Huiying,et al.Analysis on the Crack Arresting and Strengthening of Metal Structures with Embedding Hole Defects by Using Electromagnetic Heating[J]. China Mechanical Engineering,2012,23(11):1285-1288.
[6]郑丽娟,向龙,刘会莹,等.异种钢焊接接头脉冲放电强化与力学性能分析[J].中国机械工程,2012,23(12):1492-1495.
Zheng Lijuan,Xiang Long,Liu Huiying,et al.Pulse Current Discharge for Strengthening Welded Joints of Dissimilar Steel and Analysis of Mechanical Properties[J].China Mechanical Engineering,2012,23(12):1492-1495.
[7]Pataric A,Guliija Z,Jordovic B.Microstructure and Characterization of Electromagnetic Casting Al 2024 Alloy Ingots[J]. Metalurgija,2008,47(4):343-346.
[8]徐洲,赵连城.金属固态相变原理[M].北京:科学出版社,2004.
[9]付宇明,郑丽娟,田振国,等.含埋藏椭圆型裂纹的金属构件脉冲放电瞬间温度场分布[J].应用数学及力学,2008,29(7):871-876.
Fu Yuming,Zheng Lijuan,Tian Zhenguo,et al.Analysis on Temperature Field at the Time of Pulse Current Discharge in Metal Structure with Elliptical Embedding Crack[J].Applied Mathematics and Mechanics,2008,29(7):871-876.
[10]王西宁,陈铮,刘兵.磁场对材料固态相变影响的研究进展[J].材料导报, 2002,16(2):25-27.
Wang Xining,Chen Zheng,Liu Bing.Effects of Magnetic Field on Solid Phase Transformation[J].Materials Review, 2002, 16(2)： 25-27.
[11]许学军，刘庄，吴肇基，等. 应力与相变相互作用对马氏体淬火残余应力的影响[J]. 塑性工程学报,1996,3(2):59-65.
Xu Xuejun，Liu Zhuang，Wu Zhaoji，et al. Effect of Stress-phase Transformation Interactions on Residual Stresses during Martensitic Quenching of Steel[J]. Journal of Plasticity Engineering,1996,3(2):59-65.
[12]许峰云，徐雪霞，白秉哲，等. 粒状组织的相变残余应力[J].金属学报,2008,44 (9):1063-1068.
Xu Fengyun,Xu Xuexia,Bai Bingzhe,et al.Phase Transformation Residual Stress in Granular Structure[J].Acta Metallurgica Sinica,2008,44(9):1063-1068.
[13]Eshelby J D.The Determination of the Elastic of an Ellipsoidal Inclusion, and Related Problems[J].Proceeding of the Royal Society of London Series A：Mathematical and Sciences，1957,241(1226):376-396.
[14]刘宁,赵兴中,邓宗钢,等.钢和铸铁激光相变硬化层的残余应力研究[J].机械工程学报,1994,30(4):108-114.
Liu Ning,Zhao Xingzhong,Deng Zonggang,et al.Study on Residual Stresses in Laser Transformation Hardened Steel and Cast Iron[J].Journal of Mechanical Engineering,1994,30(4):108-114.

Analysis on Phase Transformation Stress after Pulse Current Discharging of Metal Component with Buried Crack

含埋藏裂纹构件脉冲放电相变应力分析

PDF

Knowledge

Abstract

Cite this article

share this article

References

Related Articles 7

Recommended Articles

Metrics

[1]	Fu Yuming, Wang Ningning, Guo Jianlong, Zheng Lijuan. Analysis of Stress Field at Time of Pulse Discharge in Metal Structure with Semicircle Embedding Crack [J]. China Mechanical Engineering, 2015, 26(4): 536-540.
[2]	Fu Yuming;Wang Junli;Zhang Shuai;Zheng Lijuan. Analysis on Phase Change Stress after Pulse Current Discharging of Metal Component with Half-embedding Cracks [J]. China Mechanical Engineering, 2013, 24(21): 2944-2947,2954.
[3]	ZHENG Li-Juan, XIANG Long, LIU Hui-Ying, LI Hui, FU Yu-Meng. Pulse Current Discharge for Strengthening Welded Joints of Dissimilar Steel and Analysis of Mechanical Properties [J]. China Mechanical Engineering, 2012, 23(12): 1492-1495.
[4]	ZHENG Li-Juan, ZHOU Gong-Mei, LIU Hui-Ying, FU Yu-Meng. Analysis 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.
[5]	Yan Peng;Zhang Jianhua;Zhang Hongli;Bai Wenfeng. Research on Machining Process in Ultrasonic Vibration Aided Grinding-EDM  [J]. J4, 2008, 19(16): 0-2011.
[6]	Yan Peng;Zhang Jianhua;Bai Wenfeng;Xu Wenwen. Influence of Machining Parameters on the Surface Roughness  of Ultrasonic Vibration Aided Grinding-EDM [J]. J4, 2008, 19(12): 0-1392.
[7]	Fu Yuming;Zheng Lijuan;Liu Yu. Analysis on the Crack Arrest in Cr12 Cold Punch Cavity Die with  Half-embedding Spatial Crack by Using Electromagnetic Heating [J]. J4, 2008, 19(10): 0-1139.