复合形变超细晶纯钛的动态再结晶模型

doi:10.11901/1005.3093.2019.442

材料研究学报

2020, Vol. 34

Issue (3): 217-224 DOI: 10.11901/1005.3093.2019.442

研究论文

本期目录 | 过刊浏览

复合形变超细晶纯钛的动态再结晶模型

马炜杰,杨西荣(

),罗雷,刘晓燕,郝凤凤

西安建筑科技大学冶金工程学院西安 710055

Dynamic Recrystallization Model of Ultrafine Grain Pure Titanium Prepared by Combined Deformation Process

MA Weijie,YANG Xirong(

),LUO Lei,LIU Xiaoyan,HAO Fengfeng

School of Metallurgy and Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China

引用本文:

马炜杰,杨西荣,罗雷,刘晓燕,郝凤凤. 复合形变超细晶纯钛的动态再结晶模型[J]. 材料研究学报, 2020, 34(3): 217-224.
Weijie MA, Xirong YANG, Lei LUO, Xiaoyan LIU, Fengfeng HAO. Dynamic Recrystallization Model of Ultrafine Grain Pure Titanium Prepared by Combined Deformation Process[J]. Chinese Journal of Materials Research, 2020, 34(3): 217-224.

全文: PDF(2738 KB) HTML

摘要:

采用室温等径弯曲通道变形(ECAP)+旋锻复合加工工艺制备超细晶纯钛，用GLEEBLE 3800热模拟试验机对其进行热压缩实验。研究了复合形变超细晶纯钛在温度为200、300、350、400和450℃，应变速率为0.01、0.1和1 s^-1条件下的变形行为。结果表明：实验中真应力-应变曲线的动态再结晶特征显著，出现了明显的单峰值应力。根据复合形变超细晶纯钛的峰值应力值建立的Arrhenius本构方程能预测峰值应力，平均相对误差仅为4.44%；大塑性变形试样在热压缩前进行的保温处理，增大了发生动态再结晶的临界应变值，其材料常数为0.8329；材料变形中的动态再结晶行为发生在应变大于0.1而小于0.4的阶段，应变大于0.4时发生二次硬化。

关键词 ：材料合成与加工工艺, 本构模型, 热压缩, 超细晶纯钛

Abstract：

The combined deformation processing technology of equal channel angular pressing (ECAP) and rotary swaging at indoor temperatures was applied to industrial pure titanium. Then the deformation behavior of the acquired ultrafine grained pure titanium by applied strain rates of 0.01, 0.1 and 1 s^-1 at 200, 300, 350, 400 and 450°C was investigated via thermal compression test with the Gleeble 3800 thermal simulator. The results show that the dynamic recrystallization characteristics of the experimental true stress-strain curve are significant, and the apparent single peak stress appears. According to the Arrhenius constitutive equation based on the peak stress value of the acquired ultrafine grained pure titanium, the peak stress can effectively be predicted with an average relative error of only 4.44%. Since the large plastic deformed sample was subjected to pre-heat insulation treatment before thermal compression, the critical strain for dynamic recrystallization was increased, of which the material constant is 0.8329. The dynamic recrystallization behavior during deformation mainly occurs in the stage where the strain is greater than 0.1 and less than 0.4. Whereas the strain is greater than 0.4, the material undergoes secondary hardening.

Key words： synthesizing and processing technics for materials constitutive model hot compression ultrafine grain pure titanium

收稿日期: 2019-09-11

ZTFLH:

TG146.2+3

基金资助:国家自然科学基金(51474170)

作者简介: 马炜杰，男，1992年生，硕士生

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https://www.cjmr.org/CN/10.11901/1005.3093.2019.442 或 https://www.cjmr.org/CN/Y2020/V34/I3/217

图1 粗晶纯钛和超细晶纯钛的微观组织

图2 超细晶纯钛的压缩变形真应力-应变曲线

图3 不同条件下压缩试样的极图

图4 在300℃、0.01 s-1条件下压缩后超细晶纯钛的TEM像

图5 超细晶纯钛的流动应力与热变形参数的关系

表1 Arrhenius本构模型的材料常数

图6 实验值与计算值的散点图

图7 加工硬化率与流动应力关系的示意图

图8 在300℃、0.01 s-1条件下的加工硬化率与流动应力曲线图

图9 在300℃、0.01 s-1条件下的dθ/dσ与真应力关系曲线

图10 临界应变与峰值应变的线性拟合图

图11 动态再结晶体积分数曲线

图12 动态再结晶材料常数线性拟合求解

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