极地低温下电弧增材制造不锈钢力学性能研究OA

Wire arc additive manufacturing(WAAM)has the potential for automated construction and is well suited for use in polar regions,where the climate is cold and harsh and labour is scarce.To facilitate such engineering applications,an experimental study into the mechanical properties of WAAM steel plates at polar temperatures was conducted.A total of 60 ER316LSi stainless steel coupon specimens,covering five directions and two surface conditions(as-built and machined),were wire arc additively manufactured.Steady-state tensile tests were conducted in the temperature range of-100℃to 20℃.The material properties,stress-strain curves and failure modes were obtained.The WAAM material exhibits significant anisotropy,with the elastic modulus in the 45° direction being notably higher than in other orientations.When the temperature decreases from 20℃to-100℃,the Young's modulus and strength of the material show an ascending trend,among which the improvement in strength is remarkable,with the yield strength and ultimate strength increasing by up to 50％.All specimens demonstrate substantial plastic deformation during low temperature tensile testing,indicating the onset of ductile fracture.Finally,predictive equations that can accurately capture the low temperature mechanical properties of the WAAM stainless steel were proposed,with prediction errors within 10％for yield strength and ultimate tensile strength,and within 20％for elastic modulus,providing experimental evidence and theoretical support for its applications in polar engineering environments.