应变速率对<strong>X80</strong>管线钢铁素体<strong>/</strong>贝氏体应变分配行为的影响

doi:10.11900/0412.1961.2021.00412

金属学报

2023, Vol. 59

Issue (10): 1299-1310 DOI: 10.11900/0412.1961.2021.00412

研究论文

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应变速率对X80管线钢铁素体/贝氏体应变分配行为的影响

王楠¹, 陈永楠¹(

), 赵秦阳¹, 武刚², 张震¹, 罗金恒²

^1.长安大学材料科学与工程学院西安 710064
^2.中国石油集团石油管工程技术研究院西安 710077

Effect of Strain Rate on the Strain Partitioning Behavior of Ferrite/Bainite in X80 Pipeline Steel

WANG Nan¹, CHEN Yongnan¹(

), ZHAO Qinyang¹, WU Gang², ZHANG Zhen¹, LUO Jinheng²

^1.School of Materials Science and Engineering, Chang'an University, Xi'an 710064, China
^2.CNPC Tubular Goods Research Institute, Xi'an 710077, China

引用本文:

王楠, 陈永楠, 赵秦阳, 武刚, 张震, 罗金恒. 应变速率对X80管线钢铁素体/贝氏体应变分配行为的影响[J]. 金属学报, 2023, 59(10): 1299-1310.
Nan WANG, Yongnan CHEN, Qinyang ZHAO, Gang WU, Zhen ZHANG, Jinheng LUO. Effect of Strain Rate on the Strain Partitioning Behavior of Ferrite/Bainite in X80 Pipeline Steel[J]. Acta Metall Sin, 2023, 59(10): 1299-1310.

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摘要:

利用代表性体积元(RVE)模型以及EBSD技术，研究了变形量为5%时X80管线钢中铁素体和贝氏体在不同应变速率(10^-4~10^-1 s^-1)下的应变分配行为和微结构演变机制。结果表明，应变速率较低时，铁素体有充足的时间来完成几何必需位错(GNDs)向低角度晶界(LAGBs)演变以及LAGBs向高角度晶界(HAGBs)的转变，使得应变畸变能得以释放，应变局域化程度较弱。随着应变速率增加，应变响应时间减少，使得LAGBs向HAGBs的转变过程受阻，导致铁素体内部积累了高密度的GNDs和LAGBs，从而加剧了应变局域化。同时，高应变速率时，铁素体和贝氏体间的应变分配系数降低，容易在其界面附近产生应变梯度，由此形成的GNDs堆积及界面背应力，使得铁素体和贝氏体分别呈现压应力和拉应力状态，极大地限制了两相间的应变协调性，增大了界面间应力集中，从而导致应变硬化能力降低。

关键词 ： X80钢, 应变速率, RVE模型, 应变局域化, 应变硬化

Abstract：

X80 pipeline steel, which is mainly composed of ferrite/bainite, is an important structural steel for pipeline transportation. The plastic deformation of X80 pipeline steel at different strain rates caused by geological and human factors deteriorates its strength. Microstructural transformation and strain localization during deformation are the fundamental factors that deteriorate the mechanical properties of steel. Therefore, in this study, the strain partitioning behavior and microstructure evolution mechanism of ferrite and bainite in X80 pipeline steel at different strain rates (10^-4 s^-1 to 10^-1 s^-1) under 5% deformation were revealed using representative volume element models and electron backscatter diffraction technology. The results show that when the strain rate is low (10^-4 s^-1 to 10^-3 s^-1), ferrite has sufficient time to complete the evolution of geometrically necessary dislocations (GNDs) to low-angle grain boundaries (LAGBs) and the transformation of LAGBs to high-angle grain boundaries (HAGBs). Ferrite can release strain distortion energy, which can weaken the strain localization behavior of X80 steel. As the strain rate increases, the strain response time decreases, hindering the transition from LAGBs to HAGBs. This results in the accumulation of high-density GNDs and LAGBs in ferrite, thereby intensifying strain localization. Additionally, when the strain rate is high (10^-2 s^-1 to 10^-1 s^-1), the strain partitioning coefficient between ferrite and bainite could be reduced, thereby producing the strain gradient in the vicinity of the interface and resulting in GNDs accumulation and back stress formation. Furthermore, ferrite and bainite could show compressive and tensile stresses, respectively, thus limiting the strain coordination between the two phases significantly, increasing the stress concentration near the interface, and reducing the strain hardening ability. The strain partitioning behavior between ferrite and bainite was further revealed to better understand the plastic deformation of X80 pipeline steel.

Key words： X80 steel strain rate RVE model strain localization strain hardening

收稿日期: 2021-09-27

ZTFLH:

TG142.1

基金资助:陕西省自然科学基金项目(2019JZ-27)

通讯作者: 陈永楠，frank_cyn@163.com，主要从事金属力学性能和表面强化研究

Corresponding author: CHEN Yongnan, professor, Tel: 13384948620, E-mail: frank_cyn@163.com

作者简介: 王楠，男，1994年生，博士生

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https://www.ams.org.cn/CN/10.11900/0412.1961.2021.00412 或 https://www.ams.org.cn/CN/Y2023/V59/I10/1299

图1 基于X80管线钢金相组织建立代表性体积元(RVE)模型示意图及铁素体和贝氏体的真应力-应变曲线

表1 铁素体和贝氏体的力学性能参数[21]

图2 变形量为5%时铁素体、贝氏体和X80钢在不同应变速率下的等效塑性应变(PEEQ)分布

图3 变形量为5%时不同应变速率下铁素体和贝氏体的概率密度函数、应变局域化因子、累积密度函数(CDF)以及两相间的塑性变形差异

图4 铁素体和贝氏体之间的应变分配行为

图5 不同应变速率下X80钢的工程应力-应变曲线和应变速率敏感指数

表2 不同应变速率下X80钢的力学性能

图6 X80钢在变形量为5%时不同应变速率下的局部平均取向差(KAM)图及铁素体和贝氏体间的应变梯度

图7 几何必需位错(GNDs)堆积引起的背应力示意图和不同应变速率后的GNDs密度分布

图8 X80钢在不同应变速率下的晶界分布图及取向差统计图

图9 X80钢在不同应变速率下低角度晶界(LAGBs)和高角度晶界(HAGBs)的相对体积分数

图10 X80钢从屈服到变形量5%时低应变速率和高应变速率下铁素体内部微结构演变示意图

图11 不同应变速率下X80钢的应变硬化行为

表3 修正C-J模型中各阶段应变硬化能力及转变点应变

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