研究了激光焊对Fe-Mn-Si系形状记忆合金焊缝区组织和性能的影响，结果表明，激光焊焊缝区组织显著细化，大大提高基体的强度，同时，由于激光焊焊缝过冷度大，容易产生较多的层错，这些层错有利于应力诱发ε马氏体形核，从而显著提高焊缝区的形状记忆效应，和母材相比，提高幅度达40％~178％左右；在模拟油田介质情况下，激光焊焊缝耐腐蚀性能高于母材，这是因为，激光焊焊缝组织细小均匀，在腐蚀过程中产生钝化现象，同时也降低了腐蚀电池的电位差，从而降低了合金的腐蚀速度，提高耐腐蚀性能。
This paper studied the effect of laser welding on the microstructure and properties in weld zone of Fe-Mn-Si based shape memory alloys.The result showed that weld microstructure could be remarkably refined and the matrix strength improved greatly.In the meanwhile,larger degree of supercooling caused more stacking faults which were conducive to nucleation ofεmartensite,a significant improvement of shape memory effect was obtained accordingly,and compared to matrix,it was increased by 40%-178%.In simulated oilfield medi-um,due to the passivate phenomenon in the weld with fine and uniform microstructure during corrosion process,at the same time also reduces the corrosion potential of the battery,the corrosion rate was decreased so that the corrosion resistance of the weld was better than the matrix.
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