Research on residual stress inside Fe-Mn-Si shape memory alloy coating by laser cladding processing

• Published in: Optoelectronics letters Vol. 12; no. 5; pp. 344 - 348
• Main Author: 鞠恒 林成新 张佳琪 刘志杰
• Format: Journal Article
• Language: English
• Published: Tianjin Tianjin University of Technology 01.09.2016; Springer Nature B.V
• Subjects: 304不锈钢; ANSYS模拟; Austenitic stainless steels; Coating; Deformation; Diffraction patterns; Fe-Mn-Si形状记忆合金; Finite element method; Hole drilling method; Iron; Laser beam cladding; Lasers; Martensite; Martensitic transformations; Optical Devices; Optics; Photonics; Physics; Physics and Astronomy; Residual stress; Shape memory alloys; 合金涂层; 有限元软件; 残余应力; 激光熔覆工艺; 铁锰硅合金
• ISSN: 1673-1905; 1993-5013
• DOI: 10.1007/s11801-016-6131-1

The stainless Fe-Mn-Si shape memory alloy（SMA） coating was prepared on the surface of AISI 304 stainless steel. The principal residual stress measured by the mechanical hole-drilling method indicates that the Fe-Mn-Si SMA cladding specimen possesses a lower residual stress compared with the 304 stainless steel cladding specimen. The mean stress values of the former and the latter on 10-mm-thick substrate are 4.751 MPa and 7.399 MPa, respectively. What＇s more, their deformation values on 2-mm-thick substrate are about 0° and 15°, respectively. Meanwhile, the variation trend and the value of the residual stress simulated by the ANSYS finite element software consist with experimental results. The X-ray diffraction（XRD） pattern shows ε-martensite exists in Fe-Mn-Si SMA coating, which verifies the mechanism of low residual stress. That＇s the γ→ε martensite phase transformation, which relaxes the residual stress of the specimen and reduces its deformation in the laser cladding processing.