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本文研究了不同含量的Ni·Cr和Mo与含碳量从0.12～0.42％(重量百分数)的几种低合金结构钢,以确定转变组织对强度与韧性的影响。强度与韧性分别以室温下拉伸试验的屈服应力(Б0.2)和摆锤冲击试验的韧脆转化温度(DBTT)来评价。结论很有意思:在马氏体与下贝氏体组织中观察到轮廓清楚的“束”(Packet),屈服应力与DBTT基本由该束的直径控制,随着束间距离的减少,机械性能略有提高。如果钢的显微组织为上贝氏体,则“束”由轮廓清楚的“块”(Block)所组成,“块”的尺寸控制屈服应力和DBTT。
In this paper, several low alloy structural steels with different contents of Ni · Cr and Mo and carbon contents from 0.12% to 0.42% (weight percent) were studied to determine the effect of the transformed structure on strength and toughness. The strength and toughness are respectively evaluated by the yield stress (Б0.2) of the tensile test at room temperature and the ductile-brittle transition temperature (DBTT) of the pendulum impact test. The conclusion is interesting: clearly outlined “bundles” (Packet) were observed in both martensite and lower bainite and the yield stress and DBTT were essentially controlled by the diameter of the bundle. As the distance between the bundles decreased, the mechanical properties were slightly Improve. If the microstructure of the steel is upper bainite, the “beam” consists of a well-defined “block” whose dimensions control the yield stress and the DBTT.