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本文研究了五种高Mo奥氏体Cr-Ni钢固溶处理后的组织与耐蚀性、等温回火后的析出行为及其组织对耐蚀性的影响,其结果如下:①在固溶处理状态,腐蚀性能主要取决于基体的化学成分,特别是Mo含量;②在等温回火处理过程中,中间金属相和碳化物开始析出时间和析出量受C和Mo含量的影响,Mo和C含量愈高,开始析出时间愈早。氮的加入抑制了中间相的析出,③钢在敏化状态,由于晶界上的析出,耐蚀性急剧降低。蚀点首先在晶界形成,然后沿晶界发展,最后导致晶粒脱落。
In this paper, the microstructure and corrosion resistance of five kinds of high-Mo austenitic Cr-Ni steel after solution treatment, the precipitation behavior after isothermal tempering and the effect of microstructure on the corrosion resistance were studied. The results are as follows: In the isothermal tempering process, the precipitation time and amount of precipitation of the intermediate metal phases and carbides are affected by the contents of C and Mo, and the contents of Mo and C The higher the content, the sooner the precipitation begins. The addition of nitrogen suppresses the precipitation of the mesophase. (3) In the sensitized state of steel, the corrosion resistance drastically decreases due to the precipitation on the grain boundary. Etch point first formed in the grain boundary, and then along the grain boundary development, the final lead to the grain fall off.