合金元素对316LN不锈钢的力学性能和点蚀性能的影响

发布时间：2018-04-17 03:23

本文选题：奥氏体不锈钢 + 合金元素　；参考：《工程科学学报》2015年09期

【摘要】：研究了N、Cr、Mo和Ni四种合金元素含量的变化对核电主管道用固溶态316LN不锈钢的晶粒尺寸以及常规力学性能和点蚀性能的影响.随着N含量的升高,316LN的晶粒明显细化,其在固溶处理过程中晶粒长大趋势也减小.N含量的升高可改善316LN的力学性能和耐点蚀性能,但是当N质量分数达到0.20%时,其耐点蚀性能又开始变差.晶粒细化对316LN强度的影响远小于N含量对316LN强度的影响.Cr及Ni含量对316LN的晶粒尺寸及抗拉强度、屈服强度等力学性能影响不大;Cr含量增加可轻微改善316LN的抗点蚀能力,Ni元素对316LN的耐点蚀性能影响不大,但可增大钝态的腐蚀速度从而不利于钝化膜的稳定.随Mo含量增加,316LN的晶粒尺寸略有减小,强度增大,延伸率显著降低,耐点蚀能力改善.
[Abstract]:The effects of the contents of four kinds of alloying elements Nu Cr Mo and Ni on the grain size, conventional mechanical properties and pitting corrosion properties of solid solution 316LN stainless steel for nuclear power main pipeline were studied.With the increase of N content, the grain size of X316LN is obviously refined, and the increase of grain length during solution treatment can also improve the mechanical properties and pitting corrosion resistance of 316LN, but when the N content reaches 0.20%,Its pitting corrosion resistance began to deteriorate again.The effect of grain refinement on 316LN strength is much smaller than that of N content on 316LN strength .Cr and Ni content on the grain size and tensile strength of 316LN.The increase of mechanical properties such as yield strength has little effect on the pitting corrosion resistance of 316LN and Ni element has little effect on the pitting corrosion resistance of 316LN, but it can increase the corrosion rate of passivation state, which is not conducive to the stability of passivation film.With the increase of Mo content, the grain size, strength, elongation and pitting corrosion resistance of Y316LN decrease slightly.
【作者单位】：北京科技大学新金属材料国家重点实验室;北京科技大学钢铁共性技术协同创新中心;
【基金】：国家高技术研究发展计划资助项目(2012AA03A507)
【分类号】：TG142.71

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