冷拉拔钢丝横截面应变不均匀性的晶体塑性研究

doi:10.11901/1005.3093.2023.221

材料研究学报

2024, Vol. 38

Issue (2): 81-91 DOI: 10.11901/1005.3093.2023.221

研究论文

本期目录 | 过刊浏览

冷拉拔钢丝横截面应变不均匀性的晶体塑性研究

赵勇¹^,², 刘腾远¹^,², 贾春妮¹^,², 杨朕聃¹^,², 陈响军¹^,², 王培¹^,²(

), 李殿中¹^,²

^1.中国科学院金属研究所沈阳材料科学国家研究中心沈阳 110016
^2.中国科学技术大学材料科学与工程学院沈阳 110016

Crystal Plasticity Study on the Non-uniformity of Strain on the Cross-section of Cold Drawn Steel Wire

ZHAO Yong¹^,², LIU Tengyuan¹^,², JIA Chunni¹^,², YANG Zhendan¹^,², CHEN Xiangjun¹^,², WANG Pei¹^,²(

), LI Dianzhong¹^,²

^1.Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
^2.School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, China

引用本文:

赵勇, 刘腾远, 贾春妮, 杨朕聃, 陈响军, 王培, 李殿中. 冷拉拔钢丝横截面应变不均匀性的晶体塑性研究[J]. 材料研究学报, 2024, 38(2): 81-91.
Yong ZHAO, Tengyuan LIU, Chunni JIA, Zhendan YANG, Xiangjun CHEN, Pei WANG, Dianzhong LI. Crystal Plasticity Study on the Non-uniformity of Strain on the Cross-section of Cold Drawn Steel Wire[J]. Chinese Journal of Materials Research, 2024, 38(2): 81-91.

全文: PDF(4897 KB) HTML

摘要:

建立钢丝多道次拉拔宏观有限元和珠光体团等效晶体塑性有限元相耦合的多尺度模型，研究了冷拉拔钢丝横截面的应变分布、应变路径的演化规律和应变量及应变路径对材料强化效应的影响。结果表明，钢丝冷拉拔后其横截面上的塑性应变量呈现出从心部到表面先升高后降低的分布特征，钢丝心部区域的应变路径接近等比例加载，而靠近表面区域的应变路径则比较曲折。曲折多变的应变路径使更多的滑移系开动，从而产生额外的强化最终使材料的硬度提高。横截面不同位置的应变量和应变路径差异的综合作用，使冷拔钢丝横截面上次表层的硬度最高。

关键词 ：材料合成与加工工艺, 应变不均匀性, 晶体塑性有限元, 冷拉拔钢丝, 应变路径

Abstract：

A macroscopic finite element model of multi-pass cold drawing coupled with a microscopic crystal plasticity finite element model of pearlite has been established in this study. The strain distribution and strain path of the cold drawn steel wire have been simulated, and the influence of them on the material strengthening have been analyzed. It is found that the plastic strain on the cross-section of the steel wire increases first and then decreases from the core to the surface after cold drawing. Meanwhile, the strain path in the core area of the steel wire is close to proportional loading, while the strain path near the surface is tortuous. The tortuous strain path can drive more slip systems to act, causing additional strengthening and ultimately increasing hardness. Under the comprehensive effect of the difference of strain and strain path in different areas of the cross-section, the subsurface hardness of the cold-drawn steel wire is the highest.

Key words： synthesizing and processing technics for materials non-uniformity of strain crystal plasticity finite element method cold drawn steel wire strain path

收稿日期: 2023-04-11

ZTFLH:

TG356.4+6

基金资助:国家自然科学基金(52031013)

通讯作者: 王培，研究员，pwang@imr.ac.cn，研究方向为先进钢铁材料

Corresponding author: WANG Pei, Tel: (024)83970106, E-mail: pwang@imr.ac.cn

作者简介: 赵勇，男，1998年生，硕士生

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https://www.cjmr.org/CN/10.11901/1005.3093.2023.221 或 https://www.cjmr.org/CN/Y2024/V38/I2/81

表1 拉拔工艺参数

图1 拉拔的二维轴对称模型

图2 反求法中吻合良好的工程应力-工程应变曲线和仿真模拟使用的材料真应力-真应变曲线

图3 二维珠光体团RVE模型以及实验和模拟的真应力-真应变曲线

Parameter	Symbol	Value
Elastic moduli	C₁₁	197000 MPa
	C₁₂	134000 MPa
	C₄₄	105000 MPa
Rate sensitivity parameter	n	10 ^[27]
Reference strain rate	$a ˙$	8.74 × 10^-4 s^-1
Burgers vector	b	2.48 × 10^-7 mm ^[28,29]
Dislocation density	g_minter	0.6
evolution coefficient	g_immob	0.035
	g_recov	80
	g_sour	10^-5
Initial dislocation density	ρ_im0	240000 mm^-2
	ρ_m0	240000 mm^-2
Static yield stress	τ_y	120 MPa ^[30,31]
Shear moduli	G	115022 MPa
Interaction coefficient	a_αα	0.8
	a_αβ	0.6

表2 计算等效珠光体材料的晶体塑性需要的参数

图4 拉拔后钢丝横截面上轴向和径向应变的分布以及等效应变分布和RVE模型计算选点

图5 拉拔模拟所得钢丝表面和心部的应变路径图及钢丝表面轴向和径向应变随时间变化曲线

图6 6个代表点处RVE模型中滑移系总剪切应变和不可动位错密度两个指标的平均值

图7 钢丝横截面上维氏硬度的测量结果

图8 A微区平均Mises等效应力随时间变化图和第1道次中各点Mises等效应力峰值对比图

图9 4个点对应的RVE模型在1道次末的滑移系开动情况分布

图10 选取典型晶粒的示意图

表3 A、E两模型中代表性晶粒上的滑移系开动数目分布

图11 第一道次末代表性晶粒上的微观响应

图12 A、E两点在代表性晶粒上的各滑移系平均强度随各道次进行的变化

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