Research on residual stress inside Fe-Mn-Si shape memory alloy coating by laser cladding processing
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College of Transportation Equipment and Ocean Engineering, Dalian Maritime University, Dalian 116026, China

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    Abstract:

    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.

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JU Heng, LIN Cheng-xin, ZHANG Jia-qi, LIU Zhi-jie. Research on residual stress inside Fe-Mn-Si shape memory alloy coating by laser cladding processing[J]. Optoelectronics Letters,2016,12(5):344-348

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History
  • Received:June 05,2016
  • Online: September 06,2016
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