Residual stress simulation and measurement of Fe-Mn-Si shape memory alloy coating

Ju Heng; Lin Chengxin; Zhang Jiaqi; Liu Zhijie

doi:10.3788/IRLA201777.1017009

To prepare a low-residual-stress laser cladding coating, Fe-Mn-Si shape memory alloy(SMA) coating was prepared on the surface of the AISI 304 stainless steel. And the ANSYS finite element software was used to simulate its stress field, meanwhile the residual stress distribution of the cladding specimens was measured by the mechanical hole-drilling method under the same process to verify the correctness of simulation. What's more, the mechanism of low residual stress inside Fe-Mn-Si SMA coating was analyzed by XRD. The results show that the stress caused by laser cladding induces the martensite phase transition inside the coating to get a low residual stress coating. And the coating alternately bears the thermal stress of tensile-pressure-tensile during laser spot getting closer and further to the coating center. And the thermal stress was inversely proportional to the distance between the simulating nodes and the center of laser heat source. When the specimen was completely cooled to the room temperature, the residual stress inside coating presented tensile stress, and its maximum value happened at the junction between the substrate and the coating. In the directions of parallel and vertical to the laser scanning, stress value was relatively small in the middle region, but large in two sides. And from the coating peak to the fusion line in the thickness direction, the residual stress was tensile stress and the extreme value of stress was locating at the center of the coating. Far away from the fusion line, the substrate bore pressure stress and levels off to zero-stress state.

Residual stress simulation and measurement of Fe-Mn-Si shape memory alloy coating

1. Transportation Equipments and Ocean Engineering College,Dalian Maritime University,Dalian 116026,China

Received Date: 2017-02-09

Rev Recd Date: 2017-03-12

Publish Date: 2017-10-25

Key words:

Abstract: To prepare a low-residual-stress laser cladding coating, Fe-Mn-Si shape memory alloy(SMA) coating was prepared on the surface of the AISI 304 stainless steel. And the ANSYS finite element software was used to simulate its stress field, meanwhile the residual stress distribution of the cladding specimens was measured by the mechanical hole-drilling method under the same process to verify the correctness of simulation. What's more, the mechanism of low residual stress inside Fe-Mn-Si SMA coating was analyzed by XRD. The results show that the stress caused by laser cladding induces the martensite phase transition inside the coating to get a low residual stress coating. And the coating alternately bears the thermal stress of tensile-pressure-tensile during laser spot getting closer and further to the coating center. And the thermal stress was inversely proportional to the distance between the simulating nodes and the center of laser heat source. When the specimen was completely cooled to the room temperature, the residual stress inside coating presented tensile stress, and its maximum value happened at the junction between the substrate and the coating. In the directions of parallel and vertical to the laser scanning, stress value was relatively small in the middle region, but large in two sides. And from the coating peak to the fusion line in the thickness direction, the residual stress was tensile stress and the extreme value of stress was locating at the center of the coating. Far away from the fusion line, the substrate bore pressure stress and levels off to zero-stress state.

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Reference (10)

[1]	Liu Hongxi, Leng Ning, Zhang Xiaowei, et al. Microstructure and wear behavior of WC/CO50 composite coating on 40Cr cutting tool surface prepared by laser cladding[J]. Infrared and Laser Engineering, 2015, 44(1):178-183. (in Chinese)
[2]	Zeng Chao, Tian Wei, Liao Wenhe, et al. Study of laser cladding thermal damage:a quantified microhardness method[J]. Surf Coat Tech, 2013, 236(24):309-314.
[3]	Li Jianzhong, Li Xiangfeng, Zuo Dunwen, et al. Influence of defocusing amount on the process of Al/Ti cladding above 7050 aluminum alloy based on numerical simulation study[J]. Infrared and Laser Engineering, 2014, 44(4):1126-1133. (in Chinese)
[4]	Zhou Chaoyu, Lin Chengxin, Xu Peng, et al. In situ synthesis of Fe-Mn-Si memory alloy on the surface of stainless steel by laser cladding[J]. Rare Metal Mat Eng, 2014, 43(12):3042-3046. (in Chinese)
[5]	Zhang Ping, Ma Lin, Zhao Junjun, et al. The heat source model of the numerical simulation in the laser cladding[J]. China Surface Engineering, 2006, 19(5):161-164. (in Chinese)
[6]	Surez A, Amado J M, Tobar M J, et al. Study of residual stresses generated inside laser cladded plates using FEM and diffraction of synchrotron radiation[J]. Surf Coat Tech, 2010, 204(12):1983-1988.
[7]	Yang Xianqun. Predicting the quality of clad in laser cladding by powder and numerical simulation of cladding process[D]. Harbin:Harbin Institute of Technology, 2008. (in Chinese)
[8]	Oliveira U D, Ocelk V, Hosson J T. Residual stress analysis in co-based laser clad layers by laboratory X-rays and synchrotron diffraction techniques[J]. Surf Coat Tech, 2006, 201(3):533-542.
[9]	Bendeich P, Alam N, Brandt M, et al. Residual stress measurements in laser clad repaired low pressure turbine blades for the power industry[J]. Mater Sci Eng A, 2006, 437(1):70-74.
[10]	Gu Jianqiang, Luo Fang, Yao Jianhua. Numerical simulation of residual stress during laser cladding[J]. Laser Optoelectronics Progress, 2010, 47(10):81-86. (in Chinese)

Residual stress simulation and measurement of Fe-Mn-Si shape memory alloy coating

doi: 10.3788/IRLA201777.1017009

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通讯作者: 陈斌, bchen63@163.com

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