【作者】 孙新军； 徐曼； 刘清友； 雍岐龙； 董瀚；

【Author】 Sun Xinjun Xu Man Liu Qingyou Yong Qilong Dong Han (Central Iron & Steel Research Institute,Beijing, 100081)

【机构】 钢铁研究总院；

【摘要】 本文通过热模拟试验,研究了0.058%C-0.92%Mn-0.51%V钢在变形后等温过程中的组织变化规律及显微硬度变化规律,并用透射电镜研究了V(C,N)的沉淀析出规律。结果表明,变形后在650-750℃等温100 s时可获得准单相铁素体组织从而基本消除珠光体组织。等温转变过程中,铁素体先是主要沿奥氏体晶界形核,随后逐渐变为晶内形核。V(C,N)的沉淀析出存在两种形式:相间析出和随机析出。VC的相间析出消除了碳元素在奥氏体中的富集,因而是获得准单相铁素体组织的重要条件。更多还原

【Abstract】 The microstructural evolution and micro-hardness change in a low-carbon vanadium steel (0. 058% C-0. 92% Mn-0. 51% V) during isothermal holding after deformation in austenite region have been investigated with thermo-mechanical test and the precipitation of V ( C, N ) has been studied through TEM. The experimental results have shown that the quasi-single phase ferrite matrix micro-structure can be obtained by isothermal holding between 650℃ and 750℃ after deformation, and the pearlite could be eliminated. During the isothermal holding process,the ferrite is primarily nucleated a-long the anstenite grain boundaries, and then within the austenite grains. Two precipitation modes of V (C,N) have been observed in the tested steel; interphase precipitation and random precipitation. The inter-phase precipitation of VC can eliminate the enrichment of carbon in austenite, which is the prerequisite for the formation of single phase ferrite.更多还原