| 退火温度对Fe-Mn-Al-C钢组织和拉伸性能的影响 |
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| 引用本文： | 李烨,夏鹏成,谢鲲,曹梅青,谭云亮,金晓龙.退火温度对Fe-Mn-Al-C钢组织和拉伸性能的影响[J].金属热处理,2021,46(4):77-82. |
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| 作者姓名： | 李烨 夏鹏成 谢鲲 曹梅青 谭云亮 金晓龙 |
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| 作者单位： | 1.山东科技大学 材料科学与工程学院, 山东 青岛 266590; 2.山东科技大学 山东省与科技部共建矿山灾害防治国家重点实验室, 山东 青岛 266590; 3.鞍山钢铁集团 钢铁研究所 汽车和家用电器钢铁研究所, 辽宁 鞍山 114021 |
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| 基金项目： | 国家重点研发计划(2018YFC0604703);山东省自然科学基金(ZR2018MEM008) |
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| 摘 要： | 采用OM、SEM、TEM和拉伸试验等手段研究了退火温度对Fe-19Mn-2Al-0.6C钢组织和性能的影响。结果表明,退火后试验钢的基体组织为奥氏体。由于回复再结晶的完成程度不同,随着退火温度的升高,晶粒尺寸先减小再增大。同时,退火孪晶的数量逐渐增加,抗拉强度持续降低,但总伸长率先升高然后降低。当施加一定的外部载荷时,在变形过程中会产生大量的变形孪晶和位错。高密度位错在晶界或孪晶界处的缠绕和塞积阻碍了位错的进一步运动。一次孪晶和二次孪生的交割产生的动态Hall-Petch效应,以及位错和孪晶的相互作用共同导致试验钢的高加工硬化能力。Fe-19Mn-2Al-0.6C钢获得最佳综合力学性能的退火温度约为900 ℃,其抗拉强度为947.61 MPa,强塑积为49.30 GPa·%,伸长率为52.03%。
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| 关 键 词： | TWIP钢 退火 孪晶 位错 拉伸性能 |
| 收稿时间： | 2020-12-11 |
Effect of annealing temperature on microstructure and tensile properties of Fe-Mn-Al-C steel |
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| Li Ye,Xia Pengcheng,Xie Kun,Cao Meiqing,Tan Yunliang,Jin Xiaolong.Effect of annealing temperature on microstructure and tensile properties of Fe-Mn-Al-C steel[J].Heat Treatment of Metals,2021,46(4):77-82. |
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| Authors: | Li Ye Xia Pengcheng Xie Kun Cao Meiqing Tan Yunliang Jin Xiaolong |
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| Abstract: | Effect of annealing temperature on microstructure and properties of Fe-19Mn-2Al-0.6C steel was investigated by means of OM, SEM, TEM and tensile testing. The results show that after annealing, the matrix structure of the tested steel is austenite. Due to the different completeness of recovery and recrystallization, the grain size decreases first and then increases with the increase of annealing temperature. Meanwhile, the amount of annealing twins gradually increases, the ultimate tensile strength of the steel continues to decrease, but the total elongation increases first and then decreases. When a certain external load is applied to the steel, a large amount of deformation twins and dislocations will be generated during the deformation. The tangle and pile-up of high-density dislocation at grain boundaries or twin-boundaries can hinder the further movement of dislocations remarkably. The dynamic Hall-Petch effect generated by the intersecting of primary twins and secondary twins, and the interaction of dislocations and twins, together result in a high work hardening capacity of the tested steel. The optimized annealing temperature for Fe-19Mn-2Al-0.6C steel is about 900 ℃, at which the best comprehensive mechanical properties can be obtained, with the tensile strength, the strength-ductility balance, and the elongation being 947.61 MPa, 49.30 GPa·% and 52.03%, respectively. |
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| Keywords: | TWIP steel annealing twinning dislocation tensile properties |
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