Fe-Mn-Si-Cr-Ni shape memory alloy pipe joint of

Based on the analysis and abroad since the eighties the development of a new iron-based shape memory alloys on the basis of research results , presented at the pipe joint applications exist three questions: shape recovery rate and the small amount of deformation can be restored ; lack bound state of the alloy , heat recovery stress generated when the study ; alloy pipe joint performance on its application process issues few studies . This paper focuses on the expansion ratio Hydraulic pipe fittings  , recovery annealing temperature , thermal mechanical cycling training and other factors on characteristics of tube connector , and with alloy wire and sheet comparison . In addition, the use of large general-purpose finite element analysis software (ANSYS) on the tube connector system temperature field numerical simulation . Obtain the following innovative research. Quenching temperature has a great effect on the shape memory effect . Alloy at 650 ℃ ~ 750 ℃ ​​range of quenching, the best shape memory effect . This article also found that , with the quenching temperature , quenching medium different shape memory effect of the alloy increasing influence . Quenched in water alloys shape memory effect best . The research results of engineering application laid an important foundation. Thermomechanical cycle training can significantly improve the response rate and the alloy can be restored shape deformation , deformation of the alloy can be improved response alloy constraints led to room temperature after cooling is improved recovery stress σ_r