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在MP35N合金中添加0.39%的纯稀土Y,探究微量稀土Y对MP35N合金组织和性能的影响。利用金相显微镜OM和扫描电镜SEM、能谱仪EDS、透射电镜TEM对实验合金金相组织、拉伸断口形貌进行分析。结果表明,添加0.39%的稀土Y使MP35N合金再结晶过程中的晶粒细化,但对MP35N合金冷轧变形及时效处理后的力学性能的提高无明显作用,同时并未改变MP35N合金的最佳时效条件,依然为500℃、4h;稀土Y的固溶态未溶解的颗粒在冷轧过程中被压碎拉长,随着时效温度的升高和时效时间的延长,稀土Y扩散均匀;添加稀土Y对孪晶的形成无明显影响,合金的强化机制依然是时效过程中形成的孪晶。
Add 0.39% pure rare earth Y to MP35N alloy to investigate the effect of trace rare earth Y on the microstructure and properties of MP35N alloy. The metallographic microstructure and tensile fracture morphology of the alloy were analyzed by OM, SEM, EDS and TEM. The results show that adding 0.39% rare earth Y makes the grain refinement of recrystallization of MP35N alloy, but it has no significant effect on the mechanical properties of MP35N alloy after cold rolling deformation and aging treatment, Good aging conditions, still 500 ℃, 4h; solid solution of rare earth Y undissolved particles are crushed elongated in the cold rolling process, with the aging temperature and aging time extension, uniform diffusion of rare earth Y; The addition of rare earth Y has no obvious effect on the formation of twins. The strengthening mechanism of the alloy is still the twin formed during the aging process.