Effect of Healing on Microstructure by the Combined Treatment of Pulse Current and Laser Applied to Deep Crack in Titanium Alloy

doi:10.3901/JME.2017.20.038

Abstract

Abstract: As the pulse current is effective on deep crack healing and laser had more advantage in shallow crack healing, so the combined treatment of pulse current and laser is applied to deep crack in titanium alloy. During the treatment of pulse current, high temperature and local compressive stress are generated on crack tip under the detour effect. Some healing areas appear after pulse current treatment, the electron microprobe tests results show the distribution of element in healing areas is uniform and the electron microprobe analysis shows the microstructure is mainly fine acicular martensite. The healing effect of deep crack is obvious after the combined treatment. Laser remelting makes the upper crack healing and results in the formation of remelting zone-heat affect zone-matrix structure. At the position near remelting zone, the healing areas formed by the pulse current show a significant columnar crystal structure.

Key words: crack healing, laser, pulse current, titanium alloy

CLC Number:

TH17

DENG Dewei, YU Tao, ZHANG Lin, YANG Shuhua, ZHANG Hongchao. Effect of Healing on Microstructure by the Combined Treatment of Pulse Current and Laser Applied to Deep Crack in Titanium Alloy[J]. Journal of Mechanical Engineering, 2017, 53(20): 38-44.

References

[1] YADROITSEV I,KRAKHMALEV P,YADROITSAVA I. Selective laser melting of Ti6Al4V alloy for biomedical applications:Temperature monitoring and microstructural evolution[J]. Journal of Alloys and Compounds,2014,583:404-409.
[2] WANG S G,WU X Q. Investigation on the microstructure and mechanical properties of Ti-6Al-4V alloy joints with electron beam welding[J]. Materials & Design,2012,36:663-670.
[3] ZHOU Y Z,GUO J D,GAO M,et al. Crack healing in a steel by using electropulsing technique[J]. Materials Letters,2004,58(11):1732-1736.
[4] ZHOU Y Z,QIN R S,XIAO S H,et al. Reversing effect of electropulsing on damage of 1045 steel[J]. Journal of Materials Research,2000,15(5):1056-1061.
[5] ZHOU Y Z,ZENG Y,HE G H,et al. The healing of quenched crack in 1045 steel under electropulsing[J]. Journal of Materials Research, 2001, 16(1):17-19.
[6] SONG H,WANG Z J. Microcrack healing and local recrystallization in pre-deformed sheet by high density electropulsing[J]. Materials Science and Engineering:A,2008, 490(1-2):1-6.
[7] HOSOI A, NAGAHAMA T, JU Y. Fatigue crack healing by a controlled high density electric current field[J]. Materials Science and Engineering:A,2012,533:38-42.
[8] HOSOI A,KISHI T,JU Y. Healing of fatigue crack by high-density electropulsing in austenitic stainless steel treated with the surface-activated pre-coating[J]. Materials,2013,6(9):4213-4225.
[9] HOSOI A,YANO T,MORITA Y,et al. Quantitative evaluation of the displacement distribution and stress intensity factor of fatigue cracks healed by a controlled high-density electric current field[J]. Fatigue & Fracture of Engineering Materials & Structures,2014,37(9):1025-1033.
[10] WANG Haibo,SONG Guolin,TANG Guoyi. Enhanced surface properties of austenitic stainless steel by electropulsing-assisted ultrasonic surface rolling process[J]. Surface and Coatings Technology,2015,282:149-154.
[11] 邓德伟,于静,刘倩倩,等. 裂纹止裂愈合技术发展现状及展望[J]. 机械工程学报,2016,52(7):122-132. DENG Dewei,YU Jing,LIU Qianqian,et al. States and prospects of crack arrest and healing technology[J]. Journal of Mechanical Engineering,2016,52(7):122-132.
[12] ZHENG X G,SHI Y N,LU K. Electro-healing cracks in nickel[J]. Materials Science and Engineering:A,2013,561:52-59.
[13] 徐永东,张文兴,柴东朗. 材料裂纹型损伤愈合过程观测[J]. 宇航材料工艺,2001(3):37-41. XU Yongdong,ZHANG Wenxing,CHAI Donglang. Observation of material crack healing process[J]. Aerospace Materials & Technology,2001(3):37-41.
[14] 胡传炘,陈忠江,王国红,等. 材料愈合研究[J]. 北京工业大学学报,1998,24(3):81-84. HU Chuanxin,CHEN Zhongjiang,WANG Guohong,et al. A cure study on material[J]. Journal of Beijing Polytechnic University,1998,24(3):81-84.
[15] 韦东滨,韩静涛,谢建新,等. 热塑性变形条件下钢内部裂纹愈合的实验研究[J]. 金属学报,2000,36(6):622-625. WEI Dongbin,HAN Jingtao,XIE Jianxin,et al. Experimental study on inner crack healing in steel during hot plastic deforming[J]. Acta Metallurgica Sinica,2000,36(6):622-625.
[16] GRUM J,SLABE J M. Effect of laser-remelting of surface cracks on microstructure and residual stresses in 12Ni maraging steel[J]. Applied Surface Science,2006,252(13):4486-4492.
[17] 彭艳芳. 脉冲电流冲击装置设计与实验研究[D]. 大连:大连理工大学,2013. PENG Yanfang. Design and experimental study of pulsed current impacting equipment[D]. Daian:Dalian University of Technology,2013.
[18] YU Jing,ZHANG Hongchao,DENG Dewei,et al. Numerical calculation and experimental research on crack arrest by detour effect and joule heating of high pulsed current in remanufacturing[J]. Chinese Journal of Mechanical Engineering,2014,27(4):745-753.
[19] HU G L,ZHU Y H,TANG G Y,et al. Effect of electropulsing on recrystallization and mechanical properties of silicon steel strips[J]. Journal of Materials Science & Technology,2011,27(11):1034-1038.
[20] 郭纯,陈建敏,周健松,等. Ti-6Al-4V激光重熔结构及摩擦学性能[J]. 中国表面工程,2011,24(3):11-16. GUO Chun,CHEN Jianmin,ZHOU Jiansong,et al. Microstructure and tribological properties of laser remelting Ti-6Al-4V[J]. China Surface Engineering,2011,24(3):11-16.