终轧温度对低合金铌钛贝氏体钢组织和性能的影响

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摘要采用光学显微镜、透射电子显微镜（TEM）、EDS能谱分析仪和拉伸冲击试验机，研究了终轧温度对TMCP(thermo-mechanical controlled processing)低合金铌钛贝氏体钢组织和性能的影响。结果表明：随着终轧温度的降低，强度和韧性先升高后降低。终轧温度为815 ℃时，由于冷却前温度已降低到奥氏体-铁素体两相区，在晶界形成大量先共析铁素体，造成了强度和韧性的下降。终轧温度为870 ℃时，得到细小的板条贝氏体＋少量的马氏体组织，在贝氏体板条上有30～50 nm的Nb、Ti析出相弥散分布，获得了最优异的性能，其屈服强度为805 MPa，抗拉强度为1 005 MPa，－20 ℃冲击功的平均值为197 J。

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	余宏伟

关键词 ：终轧温度, 铌钛合金钢, 贝氏体, TMCP, 析出物

Abstract：The effects of finish rolling temperature on microstructures and properties were investigated in TMCP (thermo-mechanical controlled processing) bainite steel using optical microscope, transmission electron microscope, EDS analysis and mechanical testing equipments. The results show that strength and toughness improve respectively as finish rolling temperature decrease. A lot of proeutectiod ferrite grains form along boundaries and strength and toughness of steel plate decreases after finish rolling at 815 ℃ with the reason of temperature drop into austenite and ferrite double phases zone before accelerate cooling. Excellent properties can be obtained by finish rolling temperature is 870 ℃. Yield and tensile strength are 805 MPa and 1 005 MPa respectively. Average charpy impact energy is 197 J. The microstructures are bainite, martensite and Nb-Ti contained dispersive precipitates with the size of 30-50 nm.

收稿日期: 2013-09-13 出版日期: 2014-06-11

引用本文:

曹立潮，余宏伟，王世森，李德发. 终轧温度对低合金铌钛贝氏体钢组织和性能的影响[J]. 钢铁, 2014, 49(6): 65-68. CAO Li-chao, YU Hong-wei, WANG Shi-sen, LI De-fa. Effects of Finish Rolling Temperature on Microstructure and Properties in Nb-Ti Low Alloying Bainite Steel. Iron and Steel, 2014, 49(6): 65-68.

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http://www.chinamet.cn/Jweb_gt/CN/ 或 http://www.chinamet.cn/Jweb_gt/CN/Y2014/V49/I6/65

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