金属学报  2007, Vol. 43 Issue (3): 315-320

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含硅的低合金超高强度贝氏体钢的晶粒细化与冲击能提高

高宽 王六定 朱明 陈景东 施易军 陈国栋

西北工业大学理学院应用物理系

Refinement of Grain and Enhancement of Impact Energy Absorption for Low-Alloy Ultra-High Strength Bainite Steels Containing Silicon

高宽; 王六定; 朱明; 陈景东; 施易军; 陈国栋 . 含硅的低合金超高强度贝氏体钢的晶粒细化与冲击能提高[J]. 金属学报, 2007, 43(3): 315-320 .

摘要 参考文献 相关文章 Metrics 全文: PDF(974 KB)   摘要: 对系列低碳、超高强度贝氏体钢(LUHSBS)，通过审慎地使用硅、锰、镍等合金元素并有效地控制相变温度、冷却与回火参数，强韧性结合良好，又冲击能(AKV ≥185 J)与同强度(＞1500 MPa)的高级马氏体钢23MnNiCrMo相比提高三倍以上。强度与韧性增强的根本原因在于组织细化、贝氏体铁素体(BF)中含碳量增加、碳化物消除以及存在较高体积分数的膜状残余奥氏体(AR)。原子力显微镜和扫描隧道显微镜分析证实：钢中不存在损伤韧性的块状AR区。不仅亚单元被超细化，而且超细亚晶粒的平均尺寸小于20 nm以及部分切变单元的平均厚度仅约1.6 nm。所有这些都是影响钢的强度、AR稳定性和AKV的主要原因。此外，对强度与韧性改善的物理机制还进行了深入的分析。 关键词 ： 贝氏体束,  贝氏体板条,  亚单元,  精细结构     Abstract：Through judiciously using the silicon, manganese and nickel as the alloying elements and effectively controlling the transformation temperature, cooling and tempering parameters for a series of low alloy ultrahigh strength bainitic steels (LUHSBS), the combination of strength and toughness are very excellent and the impact energy absorption (AKV ≥185 J) has been tripled compared to the previously advanced martensitic steel 23MnNiCrMo with the same strength level (＞1500 MPa). The basic reasons giving rise to the enhancement of strength and toughness consist in the increase of carbon content and the refinement of sublaths in the bainitic ferrite (BF) and the very thin films of retained austenite (AR). It is confirmed by the atomicforce microscope (AFM) and scanning tunneling microscope (STM) that there was no any large bulky areas of AR in the structure which is less stable and will reduce the impact toughness of bainitic steels. Not only is the sublaths is significantly refined, but also the average size of subgrains is less than 20 nm and the average thickness of shear units in a BF lath is only about 1.6 nm. The refinement of microstructure, the enrichment of interstitial atom carbon in BF and the increase of both the dislocation density and the volume fraction of AR are some critical factors that affect the ultimate tensile strength, the stability of AR and the impact energy absorption. Furthermore, the physical mechanism on the improvement of the combination of strength and toughness is in depth discussed. 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