0Cr18Ni9Ti钢焊接接头表面纳米化及接头抗H_2S应力腐蚀性能的研究

Surface Nanocrystallization of 0Cr18Ni9Ti Stainless Steel Welding Joint and Its Resistance to Stress Corrosion of Hydrogen Disulfide

为了提高不锈钢焊接接头的组织均匀性及其抗H2 S应力腐蚀性能 ,采用超音速颗粒轰击 (SupersonicParticlesBombarding缩写为 (SSPB) )技术对 0Cr18Ni9Ti不锈钢焊接接头表面进行处理 ,利用金相显微镜和透射电镜对材料表面的微观组织进行了分析。利用X射线应力衍射仪对纳米化后的式样进行残余应力分析 ,抗硫化氢应力腐蚀试验按照GB4 15 7- 84标准执行。结果表明 ,经超音速颗粒轰击处理可以使样品表层晶粒细化至纳米量级 ,表层晶粒尺寸平均为 10 .4nm ,而且表层组织得到均一化。试验证实抗H2

Supersonic particles bombarding (SSPB) technology was used to modify the surface of 0Cr18Ni9Ti stainless steel welding joint so as to increase its structure uniformity and resistance to hydrogen sulfide stress corrosion. Thus the microstructure of the modified surface was analyzed using a metallurgical microscope and transmission electron microscope. The residual stress in the nanocrystallized surface was analyzed using an X ray diffractometer. And the resistance of the modified surface to the stress corrosion of hydrogen sulfide was evaluated according to GB 4157-84 standard method. The results showed that surface nanocrystallization of the stainless steel occurred after the SSPB treatment, which led to the decrease in the grain size (to be about 10.4 nm) and the increase in the surface structure homogeneity. Moreover, the resistance of the stainless steel to the stress corrosion of H_2S was significantly increased after the SSPB treatment.