论文部分内容阅读
超高强度30CrMnSiA钢经两次循环热处理(淬火+回火)可使奥氏体晶粒细化到7μm左右。钢在770℃以初始应变速度(?)=2.78×10~(-4)s~(-1)拉伸,得最高延伸率867%,流动应力34.3MPa。钢在拉伸中始终保持微细等轴晶粒的原因是与钢在770℃时有接近50:50的两相(α:γ)体积比和少量合金碳化物对晶界的钉扎,还与两相强度(硬度)差不悬殊有关。钢在变形中对空洞不敏感,但试样的断裂却由于空洞的连接所致。
Ultra-high strength 30CrMnSiA steel after two cycles of heat treatment (quenching + tempering) austenite grain refinement to about 7μm. Steel at 770 ℃ with the initial strain rate (?) = 2.78 × 10 ~ (-4) s ~ (1) stretching, the highest elongation of 867%, the flow stress of 34.3MPa. The reason why the steel always maintains fine equiaxed grains during drawing is the two-phase (α: γ) volume ratio close to 50:50 with steel at 770 ° C and the pinning of the grain boundaries by a small amount of alloy carbides, Two-phase strength (hardness) is not disparities related. Steel in the deformation of the cavity is not sensitive, but the specimen is broken due to the hollow connection.