板条马氏体拉伸塑性行为的原位分析

doi:10.11900/0412.1961.2020.00275

金属学报

2021, Vol. 57

Issue (5): 595-604 DOI: 10.11900/0412.1961.2020.00275

研究论文

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板条马氏体拉伸塑性行为的原位分析

石增敏¹(

), 梁静宇¹, 李箭²(

), 王毛球³, 方子帆¹

^1.三峡大学水电机械设备设计与维护湖北省重点实验室宜昌 443002
^2.华中科技大学材料科学与工程学院武汉 430074
^3.钢铁研究总院特殊钢研究所北京 100081

In Situ Analysis of Plastic Deformation of Lath Martensite During Tensile Process

SHI Zengmin¹(

), LIANG Jingyu¹, LI Jian²(

), WANG Maoqiu³, FANG Zifan¹

^1.Hubei Key Laboratory of Hydroelectric Machinery Design & Maintenance, China Three Gorges University, Yichang 443002, China
^2.School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
^3.Special Steel Institute, Central Iron and Steel Research Institute, Beijing 100081, China

引用本文:

石增敏, 梁静宇, 李箭, 王毛球, 方子帆. 板条马氏体拉伸塑性行为的原位分析[J]. 金属学报, 2021, 57(5): 595-604.
Zengmin SHI, Jingyu LIANG, Jian LI, Maoqiu WANG, Zifan FANG. In Situ Analysis of Plastic Deformation of Lath Martensite During Tensile Process[J]. Acta Metall Sin, 2021, 57(5): 595-604.

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摘要:

采用原位中子衍射分析技术测试了板条马氏体钢的拉伸塑性行为，采用Z-Rietveld和卷积多重全曲线拟合方法对衍射数据进行拟合分析。板条马氏体内的位错为刃、螺型位错的混合位错，并呈现随机分布特征。马氏体的加工硬化需要同时考虑位错密度和位错类型2个因素的作用。随着拉伸应变量的增加，螺型位错数量减少，刃型位错数量增加，总位错密度增加。硬取向板条束内位错密度增加，呈现加工硬化特征；软取向板条束内位错密度降低，出现加工软化特征。外加应力在硬取向和软取向板条束内产生应力再分配，变形后在板条束内形成长程内应力。

关键词 ：超高强度钢, 板条马氏体, 塑性变形, 位错密度, 原位中子衍射

Abstract：

Lath martensitic steels are widely used in high strength structural materials. Coherency strains in quenched lath martensite induce huge dislocation densities, which are the sources of the alloys' strength, whereas the way its microstructure functions is still unclear. The plastic deformation behavior of lath martensite in ultrahigh strength steel was investigated using in situ neutron diffraction technology. Diffraction data were analyzed using the Z-Rietveld and convolutional multiple whole profile (CMWP) fitting procedures. Transformation dislocations in the as-quenched martensite were mixed with edge and screw components and showed characteristics of random distribution. Significant work hardening of lath martensite can be better understood by considering the increase in dislocation density along with changes in dislocation arrangement. With increased tensile strain, the total dislocation density increased with the increasing amount of edge-type components and the decreasing amount of screw-type components. The hard orientation packets showed characteristics of work hardening with an increased dislocation density, whereas the soft orientation packets showed characteristics of work softening with a decreased dislocation density. The partitioning of the applied load was carried out within two types of packets, which further promoted the formation of long-range internal stresses after deformation.

Key words： ultra-high strength steel lath martensite plastic deformation dislocation density in situ neutron diffraction

收稿日期: 2020-07-22

ZTFLH:

TG142.1

基金资助:国家重点基础研究发展计划项目(2010CB630802);国家自然科学基金项目(51201093);湖北省技术创新专项(重大项目)(2017AAA113)

作者简介: 石增敏，女，1973年生，教授，博士

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https://www.ams.org.cn/CN/10.11900/0412.1961.2020.00275 或 https://www.ams.org.cn/CN/Y2021/V57/I5/595

图1 原位衍射分析试样布置示意图

图2 22SiMn2TiB钢的SEM和EBSD像

图3 入射电子束沿<111>和<001>方向的22SiMn2TiB钢扫描透射明场(STEM-BF)像及环形暗场(ADF)像

图4 22SiMn2TiB钢的真应力-真应变曲线

图5 22SiMn2TiB钢的中子衍射谱及马氏体衍射峰相对强度随外加载荷的变化

图6 马氏体衍射峰的半峰宽(FWHM)及由卷积多重全曲线(CMWP)拟合的位错密度随应变的变化

图7 塑性变形卸载状态下的残余奥氏体体积分数

图8 沿轴向方向拉伸形变过程中测试的晶格应变以及卸载状态下两相的晶格残余应变

图9 软取向和硬取向板条束的定义方法示意图及(200)衍射峰的CMWP拟合曲线

图10 基于CMWP拟合的硬取向板条束和软取向板条束内的位错密度、位错类型及应力分布变化

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