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首页> 外文期刊>Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing >Reassessment of the effects of laser surface melting on IGC of SUS 304
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Reassessment of the effects of laser surface melting on IGC of SUS 304

机译：重新评估激光表面熔化对SUS 304的IGC的影响

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摘要

Laser surface remelting (LSM) experiments were conducted on surface of 304 stainless steel using a 2 kW CW Nd: YAG laser and the effects of LSM on the intergranular corrosion (IGC) resistance of 304 stainless steel were reassessed from view point of grain boundary engineering (GBE). LSM could make the sensitized microstructures locally desensitize, and could improve the IGC resistance. The improved IGC resistance of the laser-surface-melted specimens could be attributed in part to Cr redistribution at the boundaries of the cells and grains and in part to existence of a large amount of low energy ∑(1 ≤ ∑≤29) boundaries and the formation of <001>(1 00) texture. However, the laser-surface-melted specimens became much more susceptible to IGC in the sensitization temperature region, and the corrosion rate of the resensitized specimen was even higher than that of the base materials under the same sensitization condition. A subsequent annealing treatment changed the grain boundary character distribution (GBCD) remarkably and the IGC resistance of the processed specimens was improved.
机译：使用2 kW CW Nd：YAG激光在304不锈钢表面进行了激光表面重熔（LSM）实验，并从晶界工程的角度重新评估了LSM对304不锈钢耐晶间腐蚀性（IGC）的影响。 （GBE）。 LSM可以使敏化的微结构局部脱敏，并可以提高IGC抵抗力。激光表面熔化试样的IGC电阻提高，部分归因于细胞和晶粒边界处的Cr重分布，部分归因于大量低能∑（1≤∑≤29）的边界和<001>（1 00）纹理的形成。然而，在敏化温度范围内，经激光表面熔化的标本对IGC的敏感度更高，在相同的敏化条件下，再敏化标本的腐蚀速率甚至高于基材。随后的退火处理显着改变了晶界特征分布（GBCD），并改善了加工样品的IGC抗性。

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