钒微合金钢的热塑性  

Hot Ductility in V-microalloyed Steels

作　　者：Banks K M Tuling A Mintz B 

机构地区：[1]Dept.Materials Science,Univ.of Pretoria. [2]School of Engineering Science and Mathematics,City University,London,England

出　　处：《钢铁钒钛》2015年第5期63-68,共6页Iron Steel Vanadium Titanium

摘　　要：低碳低氮微合金钢通常表现出抗横向开裂性能,而碳含量较高的微合金钢则不然。讨论了碳含量质量分数为0.05%～0.6%的含钒微合金钢的热塑性研究和工业经验。在不同碳含量的情况下,只要[V][N]乘积不超过1×10-3,添加的钒就能降低钢对横向开裂的敏感性。铌和钒的结合增加了800～900℃临界矫直温度范围内的热塑性,这一改善得益于钒和铌复合加入减缓了动态析出过程。在含钛钢中,最初在高温下生成的Ti N具有促进Ti Nb（C,N）沉淀粗化和降低对塑性不利的细小Nb V（C,N）沉淀体积分数的额外作用。还介绍了TWIP钢热塑性的最新结果以及含钒微合金钢连铸的工业经验。Transverse cracking resistance is generally displayed in low-C low-N microalloyed steels,but not in microalloyed steels with higher C levels. This paper discusses hot ductility work and commercial experience concerning V microalloyed steels with C levels between 0. 05% ～ 0. 6 %. These V additions reduce transverse cracking susceptibility in steels with varying carbon content provided the [V][N]product does not exceed about 1 × 10- 3. The combination of Nb and V enhances hot ductility in the critical unbending temperature range of 800 ～ 900 ℃. This improvement is due to a combination of V and Nb slowing down the dynamic precipitation process. In Ti-bearing steels,initial,high-temperature Ti N formation has the additional benefit of encouraging Ti Nb（ C,N） precipitate coarsening and reducing the volume fraction of fine Nb V precipitation which are detrimental to ductility. Recent results on the hot ductility of TWIP steels as well as industrial experience in continuous casting of V-microalloyed steels is presented.

关 键 词：微合金钢 连铸 热塑性 钒 铌 钛 

分 类 号：TG142.33[一般工业技术—材料科学与工程]