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微合金化非调质钢35MnVN在860℃至1200℃进行正火处理后,随着正火温度的提高,钢的显微组织由细到粗,先析铁素体由块状均匀分布到呈网状分布且相对量减少,使钢的强度、硬度升高,而塑性和冲击韧性降低。在950℃以下正火,因未溶沉淀相粒子V(C.N)强烈阻止奥氏体晶粒长大,钢的显微组织被高度细化,使钢在保持足够高的强度下,其冲击韧性比钢在锻后空冷态提高了1.5倍以上。
Microalloyed non-quenched and tempered steel 35MnVN normalized at 860 ℃ to 1200 ℃, with the increase of normalizing temperature, the microstructure of the steel from fine to coarse, pre-ferrite from the block evenly distributed to the Reticular distribution and the relative decrease, the steel strength, hardness, and plasticity and impact toughness decreased. Normalizing below 950 ° C, the undissolved precipitated phase V (CN) strongly prevents the austenite grain growth, the microstructure of the steel is highly refined so that the steel maintains a sufficiently high strength, its impact toughness More than 1.5 times more air-cooled than forged steel.