Hot Ductility in V-microalloyed Steels
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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TiN具有促进TiNb(C,N)沉淀粗化和降低对塑性不利的细小NbV(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。Abstract: 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.
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Key words:
- microalloyed steels /
- continuous casting /
- hot ductility /
- vanadium /
- niobium
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