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首页> 外文会议>International Congress on Applications of Lasers and Electro-Optics >EFFECT OF LASER SURFACE MELTING ON CORROSION BEHAVIOR OF AGED DUPLEX STAINLESS STEEL
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EFFECT OF LASER SURFACE MELTING ON CORROSION BEHAVIOR OF AGED DUPLEX STAINLESS STEEL

机译：激光表面熔化对老年双相不锈钢腐蚀行为的影响

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Duplex stainless steels (DSSs) have been widely used as the structural components for chemical industries, oil and gas production and offshore applications due to its outstanding corrosion resistance in chloride-containing environments. However, depletion of chromium and molybdenum is a well-known problem in DSSs, especially in welded assemblies, hot-worked and improperly heat-treated parts heated at temperatures ranging from 500 to 900°C. As the sigma phase forms, it depletes the neighboring regions of Cr and Mo, thereby lowering the Cr and Mo contents of the surface oxides over these regions. Then the DSSs become susceptible to corrosion attack. Laser surface melting (LSM) is a possible route to restore the corrosion resistance of DSSs by melting the surface with a laser beam followed by rapid solidification for homogenizing chemical compositions. Different laser parameters will cause different phase distributions in the DSSs, and hence various corrosion properties may be resulted. In present study, microstructure and corrosion behavior of aged DSS 7MoPlus (UNS S32950) were investigated in 3.5% NaCl solution at 25°C before and after LSM. By LSM, the corrosion resistance of aged 7MoPlus was found to be significantly enhanced as reflected by the increase in the corrosion and pitting potentials and decrease in corrosion and passive current densities. The improvement in corrosion resistance of the aged 7MoPlus after LSM is mainly attributed to re-dissolution and removal of the s phase.
机译：双相不锈钢（DSSS）已被广泛用作用于化学工业，石油和天然气生产和海上应用的结构部件，由于在含有氯化物的环境中其出色的耐腐蚀性。然而，铬和钼的耗尽是在DSSS中一个众所周知的问题，尤其是在焊接组件，热加工和不当热处理部件的工作温度范围为500〜900℃下加热。作为σ相的形式，它耗尽Cr和Mo的邻近区域，从而降低了表面的氧化物在这些区域上的Cr和Mo含量。然后，决策支持系统变得容易腐蚀攻击。激光表面熔化（LSM）是通过使表面与激光束，接着快速凝固为均质的化学成分熔融还原决策支持系统的耐腐蚀性的可能路线。不同的激光参数将在对DSSS引起不同的相位分布，并且因此各种防腐性能可以导致。在本研究中，微结构和老化DSS 7MoPlus（UNS S32950）的腐蚀行为是在3.5％NaCl溶液，在25℃之前和之后LSM研究。由LSM，年龄7MoPlus的耐蚀性，发现通过在腐蚀和点蚀电位的增加反映并在腐蚀和无源电流密度减小到被显著增强。在LSM后老化7MoPlus的耐腐蚀性的改善主要归因于重新溶解和去除S期。

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