<strong>9Mn27Al10Ni3Si</strong>低密度钢的高温压缩变形行为及其机制

doi:10.11901/1005.3093.2021.505

材料研究学报

2022, Vol. 36

Issue (12): 907-918 DOI: 10.11901/1005.3093.2021.505

研究论文

本期目录 | 过刊浏览

9Mn27Al10Ni3Si低密度钢的高温压缩变形行为及其机制

崔志强, 张宁飞, 王婕, 侯清宇(

), 黄贞益(

)

安徽工业大学冶金工程学院马鞍山 243002

High Temperature Compression Deformation Behavior of 9Mn27Al10Ni3Si Low Density Steel

CUI Zhiqiang, ZHANG Ningfei, WANG Jie, HOU Qingyu(

), HUANG Zhenyi(

)

School of Metallurgical Engineering, Anhui University of Technology, Maanshan 243002, China

引用本文:

崔志强, 张宁飞, 王婕, 侯清宇, 黄贞益. 9Mn27Al10Ni3Si低密度钢的高温压缩变形行为及其机制[J]. 材料研究学报, 2022, 36(12): 907-918.
Zhiqiang CUI, Ningfei ZHANG, Jie WANG, Qingyu HOU, Zhenyi HUANG. High Temperature Compression Deformation Behavior of 9Mn27Al10Ni3Si Low Density Steel[J]. Chinese Journal of Materials Research, 2022, 36(12): 907-918.

全文: PDF(6741 KB) HTML

摘要:

使用Gleeble热模拟试验机、XRD、OM、SEM和TEM等手段研究了9Mn27Al10Ni3Si低密度钢在850~1050℃和0.01~5 s^-1条件下的热压缩变形特征及其机制。结果表明，对这种钢在850~950℃进行低应变速率(0.01~1 s^-1)热压缩时，κ-碳化物的析出和粗化以及在热压缩过程中摩擦系数的增大使其应变达到临界值后流变应力明显增大；随着应变速率的提高，实验钢的孪生显著增强，显著加快了奥氏体的动态再结晶过程，使其在高应变速率热压缩时动态再结晶的程度比低应变速率压缩时更为显著。再结晶的软化作用，使上述流变应力异常增大的现象逐渐减弱甚至消失。

关键词 ：金属材料, 低密度钢, 动态再结晶, 变形机制, 孪生, κ-碳化物

Abstract：

The deformation characteristics of 9Mn27Al10Ni3Si low density steel at 850~1050℃ with strain rate within the range of 0.01~5 s^-1 were investigated by using Gleeble thermal simulator, XRD, OM, SEM and TEM. The results show that when the steel is hot compressed at 850~950℃ with low strain rate (0.01~1 s^-1), the flow stress of the steel increases obviously as the strain reaches a certain critical value, which may be due to the precipitation and coarsening of κ-carbides, and the increase of friction coefficient of the steel during hot compression. With the increase of strain rate, the number of twins increases significantly, which can speed up the process of dynamic recrystallization of austenite, however, during thermal compression by high strain rate, the dynamic recrystallization process is more significant rather than by low strain rate. Due to the softening effect of recrystallization, the abnormal rise of flow stress gradually weakens or even disappears.

Key words： metallic materials low-density steel dynamic recrystallization deformation mechanism twin κ-carbides

收稿日期: 2021-09-07

ZTFLH:

TG111.7

基金资助:安徽省高等学校自然科学研究项目(KJ2019ZD07)

作者简介: 崔志强，男，1998年生，硕士生

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https://www.cjmr.org/CN/10.11901/1005.3093.2021.505 或 https://www.cjmr.org/CN/Y2022/V36/I12/907

图1 实验钢锻态的显微组织

表1 9Mn27Al10Ni3Si奥氏体基低密度钢的室温相组成(原子分数, %)

图2 实验钢的热压缩流变应力曲线

图3 实验钢在0.01 s-1条件下热压缩流变应力曲线的修正

图4 实验钢在850℃不同应变速率条件下热压缩后的显微组织

图5 实验钢在850℃热压缩后的SEM照片

图6 实验钢在0.01 s-1条件下热压缩后的金相组织

图7 实验钢在850℃、1~5 s-1条件下热压缩后的θ-σ和(-dθ/dσ)-σ曲线

图8 实验钢在850℃热压缩后的TEM组织

表2 图6和图7中TEM图像各点的EDS分析

图9 实验钢在850℃、0.01 s-1 (ε=0.9)条件下热压缩后的TEM组织

表3 实验钢在850℃热压缩时奥氏体再结晶晶粒的平均尺寸

图10 实验钢在1050℃、5 s-1 (ε=0.7)条件下热压缩后的TEM组织

图11 第一性原理研究示意图和κ-碳化物对流变应力异常增大的影响

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