形变温度对Fe-20Mn-3Cu-1.3C TWIP钢拉伸变形行为的影响

doi:10.11868/j.issn.1001-4381.2016.01.002

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摘要

运用温控拉伸实验,分析了在-100~200℃范围内变形时形变温度对Fe-20Mn-3Cu-1.3C钢力学性能和形变机理的影响。观察分析了拉伸试样的显微组织,并利用热力学经典模型,估算了温度对孪晶诱发塑性(TWIP)钢层错能的影响。结果表明:随着形变温度的升高,TWIP钢的层错能显著增加,基体中形变孪晶的体积分数逐渐减少,抗拉强度和屈服强度呈下降趋势,而伸长率先升高后降低,塑性变形机制也由孪生为主逐渐转变为以滑移为主。层错能的拟合公式为γ_SFE=26.73+9.38×10^-2T+4.22×10^-4T²-4.47×10^-7T³,与滑移相比,孪生可获得更高的应变硬化率,从而使TWIP钢获得高强度和高塑性。

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	王建亭
	周荣生
	王明杰
	朱定一

关键词 ： TWIP钢, 形变温度, 应变硬化率, 孪晶, 层错能

Abstract：

The effect of deformation temperature on the mechanical properties and deformation mechanism of Fe-20Mn-3Cu-1.3C twinning induced plasticity (TWIP) steel when deformed at -100-200℃ was analysed by temperature controlled tensile tests.The microstructure of tensile samples was observed and analysed, and then the effect between stacking fault energy of TWIP steels and deformation temperature was calculated by thermodynamic model. The results show that with the deformation temperature increasing from -100℃ to 200℃, the stacking fault energy of this steel gradually increases, but the volume fraction of twins gradually decreases. The tensile strength and yield strength will gradually decline, while the elongation of this steel firstly increases, then decreases. Furthermore, in this process, the plastic strain mechanism is transformed from twinning to slipping. The stacking fault energy γ_SFE is calculated by the equation γ_SFE=26.73+9.38×10^-2T+4.22×10^-4T²-4.47×10^-7T³. As compared with slipping, the twinning can obtain higher strain hardening rate, which leads to high strength and plasticity of the TWIP steel.

Key words： TWIP steel deformation temperature strain hardening rate twins stacking fault energy

收稿日期: 2015-08-11 出版日期: 2016-01-20

基金资助:福建省高校产学合作科技重大项目(2011H6012);福建省自然科学基金资助项目(2011J01292)

通讯作者: 朱定一 E-mail: zdy7081@163.com

作者简介: 朱定一(1958-),男,教授,博士,主要从事高强高塑性Fe-Mn-Cu-CTWIP钢的性能与组织的研究和材料的表面与界面张力的表征与计算研究,联系地址:福建省福州市上街镇学园路2号福州大学旗山校区材料科学与工程学院(350108)E-mail:zdy7081@163.com

引用本文:

王建亭, 周荣生, 王明杰, 朱定一. 形变温度对Fe-20Mn-3Cu-1.3C TWIP钢拉伸变形行为的影响[J]. 材料工程, 2016, 44(1): 11-18.
Jian-ting WANG, Rong-sheng ZHOU, Ming-jie WANG, Ding-yi ZHU. Effect of Deformation Temperature on Tensile Deformation Behavior of Fe-20Mn-3Cu-1.3C TWIP Steel. Journal of Materials Engineering, 2016, 44(1): 11-18.

链接本文:

http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2016.01.002 或 http://jme.biam.ac.cn/CN/Y2016/V44/I1/11

Fig.1 Fe-20Mn-3Cu-1.3C TWIP钢固溶处理后的金相组织
(a)及XRD谱图(b)

Fig.2 Fe-20Mn-3Cu-1.3C TWIP钢层错能随温度的变化曲线

Fig.3 Fe-20Mn-3Cu-1.3C TWIP钢在不同温度拉伸变形时的工程应力-应变曲线(a)及放大图(b)

Fig.4 Fe-20Mn-3Cu-1.3C TWIP钢的屈服强度、抗拉强度以及伸长率随变形温度的变化曲线

Fig.5 Fe-20Mn-3Cu-1.3C TWIP钢在不同温度下拉伸变形后的金相组织
(a)-100℃;(b)0℃;(c)25℃;(d)200℃

Fig.6 Fe-20Mn-3Cu-1.3C TWIP钢在不同温度下变形时应变硬化速率(dσ/dε)随真应变的变化曲线

Fig.7 不同条件下Fe-20Mn-3Cu-1.3C TWIP钢的TEM组织
(a)ε=5%,25℃；(b)ε=15%,25℃；(c)ε=30%,25℃； (d)ε=55%,25℃；(e)25℃下拉伸至断裂;(f)ε=50%,200℃

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