CAJ | 학술논문

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。
연구료Fe-Mn-Si-Cr-Ni계형상기억합금관접두형상기억효응화내부식성능。결과표명,수착예변형량적증가,관접두적형상기억효응하강,이회복응변정상승추세,당예변형초과5.3%좌우시,상승폭도불대;련접상태적관접두재모의유전개질중적내부식성능비3.5%적NaCl용액중적항식성차;재모의유전개질중,련접상태화미련접적관접두상비,유우회복응력사표면산생랍응력이급응력유발ε마씨체적존재,사련접상태적관접두내부식성능하강;수착예변형적증대,유우회복응력、관접두렬문이급정체결함밀도증가적공동작용,사련접상태적관접두내부식성능강저。
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.