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有效晶粒尺寸对高强度管线钢低温韧性的影响

Influence of Effective Grain Size on Low Temperature Toughness of High-Strength Pipeline Steel.

作者信息

Niu Yanlong, Jia Shujun, Liu Qingyou, Tong Shuai, Li Ba, Ren Yi, Wang Bing

机构信息

Department of Structural Steel, Central Iron and Steel Research Institute, Beijing 100083, China.

State Key Laboratory of Metal Materials for Marine Equipment and Applications of Iron & Steel Research Institutes of Ansteel Group Corporation, Anshan 114009, China.

出版信息

Materials (Basel). 2019 Nov 7;12(22):3672. doi: 10.3390/ma12223672.

DOI:10.3390/ma12223672
PMID:31703383
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC6888431/
Abstract

In this study, the series temperature Charpy impact and drop-weight tear test (DWTT) were investigated, the misorientation angles among structural boundaries where the cleavage crack propagated were identified, and angles of {100} cleavage planes between adjacent grains along the cleavage crack propagated path were calculated in five directions (0°, 30°, 45°, 60°, and 90° to the rolling direction) of high-grade pipeline steel. Furthermore, the effective grain size (grain with misorientation angles greater than 15°) was redefined, and the quantitative influences of the redefined effective grain size on Charpy impact and DWTT is also discussed synthetically. The results showed that the microstructure presented a typical acicular ferrite characteristic with some polygonal ferrite and M-A islands (composed of martensite and retained austenite), and the distribution of the high-angle grain boundaries were mainly distributed in the range of 45°-65° in different directions. The Charpy impact energy and percent shear area of DWTT in the five directions increased with refinement of the redefined effective grain size, composed of grains with {100} cleavage planes less than 35° between grain boundaries. The ductile-to-brittle transition temperature also decreased with the refining of the redefined effective grain size. The redefined effective grain boundaries can strongly hinder fracture propagation through electron backscattered diffraction analysis of the cleavage crack path, and thus redefined effective grain can act as the effective microstructure unit for cleavage.

摘要

在本研究中，对系列温度夏比冲击试验和落锤撕裂试验（DWTT）进行了研究，确定了解理裂纹扩展的结构边界之间的取向差角，并计算了高级别管线钢在五个方向（与轧制方向成0°、30°、45°、60°和90°）上沿解理裂纹扩展路径的相邻晶粒之间{100}解理面的角度。此外，重新定义了有效晶粒尺寸（取向差角大于15°的晶粒），并综合讨论了重新定义的有效晶粒尺寸对夏比冲击和DWTT的定量影响。结果表明，显微组织呈现出典型的针状铁素体特征，伴有一些多边形铁素体和M-A岛（由马氏体和残余奥氏体组成），不同方向上大角度晶界的分布主要集中在45°-65°范围内。五个方向上DWTT的夏比冲击能量和剪切面积百分比随着重新定义的有效晶粒尺寸细化而增加，该有效晶粒尺寸由晶界之间{100}解理面小于35°的晶粒组成。韧脆转变温度也随着重新定义的有效晶粒尺寸细化而降低。通过对解理裂纹路径的电子背散射衍射分析可知，重新定义的有效晶界能够强烈阻碍断裂扩展，因此重新定义的有效晶粒可作为解理的有效微观结构单元。

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