碳含量对Fe-Mn-Cu-C系TWIP钢组织和力学性能的影响

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摘要采用真空熔炼法制备Fe-20Mn-3.0Cu-XC系高强度高塑性合金钢，通过X射线衍射（XRD）、光学显微镜（OM）和透射电子显微镜（TEM）观察方法研究了碳含量对该系列合金微观组织和力学性能的影响，分析了合金的拉伸变形微观机制。结果表明：Fe-20Mn-3.0Cu-XC系合金拉伸变形前后均为单相奥氏体组织，未发生马氏体相变。随着碳质量分数的增加，合金的屈服强度、抗拉强度和伸长率均显著提高。Fe-20Mn-3.0Cu-1.41C合金的屈服强度为501.62MPa，抗拉强度为1178.4MPa，具有优异的综合力学性能。Fe-20Mn-3.0Cu-XC系合金具有优异的应变硬化能力。随着碳质量分数增大至1.41%，最大应变硬化指数n值达到0.782。Fe-20Mn-3.0Cu-XC系合金拉伸变形过程中，TWIP效应是主要的塑性变形机制，大量位错的塞积、形变孪晶的形成以及位错与孪晶间的交互作用共同引起材料强度和塑性的提高。

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	彭仙
	朱定一
	胡真明
	刘海军
	刘龙龙
	王明杰

关键词 ： TWIP钢, 力学性能, 应变硬化, 变形机制

Abstract：The ingots of three grades TWIP steels with the different carbon contents, i.e. Fe-20Mn-3.0Cu-0.23C, Fe-20Mn-3.0Cu-0.83C and Fe-20Mn-3.0Cu-1.41C in mass percent (the 0.23C, 0.83C and 1.41C TWIP steel, respectively), were prepared by vacuum induction melting. The effect of carbon content on the microstructures and tensile properties of Fe-20Mn-3.0Cu-XC steels were investigated by X-ray diffraction, OM and TEM, and the deformation mechanism of steels was studied. The results show that the Fe-20Mn-3.0Cu-XC steels prior to and after deformation are fully composed of austenite without martensite. All of yield strength, tensile strength and the elongation at fracture are apparently increasing with carbon content. Fe-20Mn-3.0Cu-1.41C steel exhibits superior tensile properties. the yield strength and tensile strength are 501.62MPa and 1178.4MPa, respectively. The Fe-20Mn-3.0Cu-XC steels have excellent strain hardening ability, the maximal strain hardening exponent can reach up to 0782 with the carbon content increases to 1.41%. During the tensile deformation of Fe-20Mn-3.0Cu-XC steels, TWIP effect is the dominant deformation mechanism, and the increase of strength and plasticity is attributable to large quantity of dislocation pile-up, the generation of deformation twins and the interaction of each other.

收稿日期: 2012-07-11 出版日期: 2013-05-28

引用本文:

彭仙朱定一胡真明刘海军刘龙龙王明杰 . 碳含量对Fe-Mn-Cu-C系TWIP钢组织和力学性能的影响[J]. 钢铁, 2013, 48(5): 55-61. PENG Xian,ZHU Ding-yi,HU Zhen-ming,LIU Hai-jun,LIU Long-long,WANG Ming-jie,. Effect of Carbon Content on Microstructure and Mechanical Properties of Fe-Mn-Cu-C TWIP Steels. Iron and Steel, 2013, 48(5): 55-61.

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http://www.chinamet.cn/Jweb_gt/CN/ 或 http://www.chinamet.cn/Jweb_gt/CN/Y2013/V48/I5/55

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