锻压技术

W含量对新型超高强度钢热塑性的影响

英文标题：Influence of W content on thermoplasticity for new ultra-high strength steel

分类号：TG142.41

出版年,卷(期):页码：2020,45(9):181-186

摘要：

为研究合金元素W对新型超高强度钢热塑性的影响，采用Gleeble-1500热模拟试验机研究了两种不同W含量的新型超高强度钢的高温拉伸行为，试验温度范围为800~1200 ℃，应变速率为0.1 s-1。结果表明：不同W含量的试验钢的抗拉强度接近，但低W含量的试验钢的断面收缩率明显优于高W含量的试验钢。800~ 900 ℃范围内，两种试验钢均因动态回复程度的升高而使得塑性变好，1000 ℃以上时，塑性的提升依赖于动态再结晶的进程，而高温时晶界熔断会造成断面收缩率的明显下降。结合微观组织分析得出，大颗粒含W未溶碳化物对热塑性的危害远高于细小弥散的Nb、Ti、V的析出碳化物。因此，对于高W含量的试验钢，应采用更长时间的固溶处理以实现良好的热塑性。

In order to research on the influence of alloying element W on the thermoplasticity for new ultra-high strength steel, the high temperature tensile behaviors for two kinds of new ultra-high strength steels with different W contents were studied by thermal simulation testing machine Gleeble-1500, and the test temperature range was 800-1200 ℃ and the strain rate was 0.1 s-1. The results show that the tensile strength of test steel with different W contents are similar, and the area reduction of test steel with low W content is obviously higher than that of high W content. In the range of 800-900 ℃, both two kinds of test steel have better plasticity due to the increase of dynamic recovery. Above 1000 ℃, the improvement of plasticity depends on the process of dynamic recrystallization, while the area reduction significantly drops when the grain boundary fusing happens at high temperature. Combined with microstructural analysis, it is concluded that the damage of W-containing undissolved carbides in large particles on the thermoplasticity is much higher than that of fine dispersed Nb, Ti, V precipitated carbides. Therefore, for the test steel with high W content, a solution treatment with langer times is employed to achieve better thermoplasticity.

基金项目：

宁静（1988-），女，硕士，工程师 E-mail：ningjing@nercast.com 通讯作者：苏杰（1965-），男，博士，正高级工程师 E-mail：sujie@nercast.com

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