Fe-Mn-Si-Cr-Ni系形状记忆合金管接头形状记忆效应和耐腐蚀性能的研究

摘要

Shape memory effect and corrosion resistance of the pipe joint of Fe-Mn-Si-Cr-Ni memory alloy were studied inthis paper.The results showed that with pre-deformation increasing,shape memory effect of the pipe joint would decline and the recovery of strain was on the rise.When the pre-deformation was more than 5.3%,the range of the rise was not significant.The connected pipe joint was more vulnerable to corrosion in a medium simulated oil field conditions than ina 3.5% NaCl solution.Compared to the unconnected pipe joint,corrosion resistance of the connected joint would decrease in the simulation media.It is due to the surface tensile stress caused by recovery stress and stress induced ε martensite.Moreover,with pre-deformation increasing,corrosion resistance of the connected joint would decrease.It is the result of the combination of recovery stress,pipe joints crack and increase of crystal defect density.%研究了Fe-Mn-Si-Cr-Ni系形状记忆合金管接头形状记忆效应和耐腐蚀性能。结果表明,随着预变形量的增加,管接头的形状记忆效应下降,而恢复应变呈上升趋势,当预变形超过5.3%左右时,上升幅度不大;连接状态的管接头在模拟油田介质中的耐腐蚀性能比3.5%的NaCl溶液中的抗蚀性差;在模拟油田介质中,连接状态和未连接的管接头相比,由于回复应力使表面产生拉应力以及应力诱发ε马氏体的存在,使连接状态的管接头耐腐蚀性能下降;随着预变形的增大,由于回复应力、管接头裂纹以及晶体缺陷密度增加的共同作用,使连接状态的管接头耐腐蚀性能降低。