含氮马氏体不锈钢的腐蚀行为研究进展

Research progress on corrosion behavior of nitrogen-alloyed martensitic stainless steel

含氮马氏体不锈钢(nitrogen-alloyed martensitic stainless steel,NAMSS)因其高韧性、高硬度、优良的抗疲劳性能和良好的耐腐蚀性而被广泛应用。耐腐蚀性能对NAMSS的使用寿命起着至关重要的作用,因此,研究NAMSS的腐蚀行为具有重要的学术意义和工程应用价值。结合国内外的研究工作,对NAMSS的腐蚀行为的研究工作进行了综述和分析。与传统马氏体不锈钢相比,NAMSS中析出相减少,提高了NAMSS的耐蚀性。NAMSS中夹杂物残留导致腐蚀成核位置增加,加速了腐蚀速率。N的存在促进了NAMSS中残余奥氏体/逆变奥氏体的形成,有利于耐蚀性能的改善。但是,过多的N含量反而不利于钢的耐腐蚀性能。最后,对未来NAMSS腐蚀行为的研究工作做了展望。

Nitrogen-alloyed martensitic stainless steel(NAMSS)was widely used due to its high toughness,hardness,excellent fatigue resistance,good corrosion resistance,and other advantages.The corrosion resistance of NAMSS played a critical role in its service life.The corrosion behavior of NAMSS was of academic and engineering interests.Here,the corrosion behavior of NAMSS was reviewed and analyzed based on domestic and foreign research works.Compared to the conventional martensitic stainless steel,fewer precipitates form in NAMSS,which improves the corrosion resistance of NAMSS.Inclusions retained in NAMSS result in the increase of corrosion nucleation sites,accelerating the corrosion rate.The presence of nitrogen promotes the formation of retained austenite/reverted austenite in NAMSS,improving the corrosion resistance.However,the excess nitrogen in NAMSS is detrimental to the corrosion resistance.Finally,future research work on the corrosion behavior of NAMSS was suggested.