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通过混合Cr_2N和Fe-Cr合金粉达到Fe-23%Cr-1%N粉末比例,并在氩气气氛下进行了球磨。在真空不锈钢管中将Fe-23%Cr-1%N粉末加热至800℃并固化,再将固化材料加热至900~1200℃实现奥氏体化,最后进行不保温淬火。结果表明:试样在小于1050℃热处理后的组织为马氏体,但经高于1100℃热处理后可形成稳定的奥氏体组织以及少量的Cr_2N。由于氧化物弥散分布在钢内,基体晶粒保持细小,钢的屈服强度高达1.1 GPa,伸长率达到30%,如此高的强化效应是氮的固溶强化和细晶强化共同作用的结果。
The proportion of Fe-23% Cr-1% N powder was achieved by mixing Cr 2 N and Fe-Cr alloy powders and ball-milling under an argon atmosphere. The Fe-23% Cr-1% N powder was heated to 800 ° C in a stainless steel vacuum tube and cured. The hardened material was then heated to 900-1200 ° C for austenitizing and finally quenched without holding. The results show that the microstructure of the sample is martensite after heat treatment at less than 1050 ℃, but stable austenite and a small amount of Cr_2N can be formed by heat treatment above 1100 ℃. Since the oxide is dispersed in the steel, the matrix grains remain small, the yield strength of the steel reaches as high as 1.1 GPa, and the elongation reaches 30%. Such a high strengthening effect is a result of the combined action of solid solution strengthening and fine grain strengthening of nitrogen.