• CN：11-2187/TH
  • ISSN：0577-6686
机械工程学报

›› 2003, Vol. 39 ›› Issue (8): 27-31.

• 论文 • 上一篇    下一篇

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无碳化物贝氏体/马氏体复相钢的强韧性?

刘东雨;方鸿生;白秉哲;杨志刚;杨金波   

  1. 清华大学材料科学与工程系
  • 发布日期:2003-08-15

STRENGTH AND TOUGHNESS OF A CARBIDE FREE BAINITE-MARTENSITE STEEL

Liu Dongyu;Fang Hongsheng;Bai Bingzhe;Yang Zhigang;Yang Jinbo   

  1. Tsinghua University
  • Published:2003-08-15

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摘要： 探讨了回火温度对低碳Mn-Si-Cr钢的空冷无碳化物贝氏体/马氏体复相组织及水淬马氏体组织强韧性的影响。试验表明：经中温回火的空冷无碳化物贝氏体/马氏体复相组织具有较高的强韧性, 且中温回火的无碳化物贝氏体/马氏体复相组织的J积分断裂韧度需用JIC来表征。经360℃回火后，空冷无碳化物贝氏体/马氏体复相组织的强韧性为? 0.2＝1 355 Mpa，?b＝1 600 Mpa，?5＝13.5 %，?＝56.2 %，AK＝81 J, 相同钢的水淬马氏体组织的强韧性为?0.2＝1 350 Mpa，?b＝1 617 Mpa，?5＝14.1%，?＝59.5，AK＝67.5 J。其原因在于中温形成的无碳化物贝氏体具有较高的回火抗力，而无碳化物贝氏体中的热稳定性较高的富碳膜状残余奥氏体使钢呈现较高的韧性。

关键词: 断裂韧度, 强韧性, 无碳化物贝氏体/马氏体复相钢

Abstract: Effect of tempering temperature on the combination of strength and toughness of air cooled carbide free bainite-martensite (CFB/M) microstructure and water quenched martensite (M) microstructure for a low carbon Mn-Si-Cr steel is experimentally investigated. The results show that CFB/M microstructure compared with M microstructure has a better combination of strength and toughness after intermediate temperature tempering. The fracture toughness of the steel with CFB/M microstructure should be characterized by JIC while that of the steel with M could be characterized by KIC after tempering. After tempering at 360 ℃,the combination of strength and toughness of the steel with CFB/M microstructure is s 0.2＝ 1 355 Mpa，sb＝1 600 Mpa，δ5＝13.5 %，j＝56.2 %， AK＝81 J, while that of the same steel with M microstructure is s0.2＝1 350 Mpa，sb＝1 617 Mpa，d 5＝14.1%，j＝59.5， AK＝67.5 J. The cause might be that CFB has a higher temper resistance than M. And carbon enriched retained austenite film in CFB with a good thermal stability might improve the toughness of the steel after tempering at intermediate temperature.

Key words: Carbide free bainite-martensite steel, Fracture toughness, Strength and toughness

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