终锻温度对Nb-V-Ti复合非调质钢组织及性能的影响

发布时间：2018-03-20 02:00

本文选题：微合金非调质钢　切入点：铌　出处：《钢铁研究学报》2017年01期 　论文类型：期刊论文

【摘要】：通过金相、扫描、透射电镜研究不同锻造工艺下V-Ti、Nb-V-Ti两种微合金化非调质钢的微观组织结构及力学性能。结果显示:添加Nb能够显著提高非调质钢的奥氏体粗化温度,有效阻止奥氏体晶粒的快速长大,细化非调质钢晶粒,降低珠光体层片间距,使渗碳体呈粒状或球状分布;另外,添加的Nb促进V-Ti非调质钢中细小含铌碳化物的弥散析出,细化基体组织,同时提高非调质钢的强度。因此,Nb-V-Ti复合微合金化非调质钢经过未再结晶区变形后可获得均匀细小的铁素体-珠光体双相组织,且在相对较低的温度进行形变处理能够有效改善Nb-V-Ti微合金非调质钢的强韧性。
[Abstract]:The microstructure and mechanical properties of two kinds of micro-alloyed non-quenched and tempered V-Ti-Nb-V-Ti steels under different forging processes were studied by metallography, scanning and transmission electron microscopy. The results showed that the austenitic coarsening temperature of non-quenched and tempered steels could be significantly increased by adding NB. It can effectively prevent the rapid growth of austenitic grain, refine the grain of non-quenched and tempered steel, reduce the lamellar spacing of pearlite, and make the cementite appear granular or spherical distribution. In addition, the addition of NB can promote the dispersion precipitation of fine niobium carbide in V-Ti non-quenched and tempered steel. The microstructure of the matrix is refined and the strength of the non-quenched and tempered steel is increased. Therefore, after the deformation of the non-recrystallization zone of the Nb-V-Ti composite microalloyed non-quenched and tempered steel, the homogeneous fine ferrite pearlite dual phase structure can be obtained. Deformation treatment at relatively low temperature can effectively improve the strength and toughness of Nb-V-Ti microalloyed non-quenched and tempered steel.
【作者单位】：江苏苏钢集团;华中科技大学材料科学与工程学院;钢铁研究总院特殊钢研究所;
【基金】：国际钒技术委员会(Vanitec)合作资助项目(V137)
【分类号】：TG142.1;TG316

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