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2.25Cr-1Mo-0.25V钢焊缝金属的微观结构与夏比冲击韧性

Microstructure and Charpy Impact Toughness of a 2.25Cr-1Mo-0.25V Steel Weld Metal.

作者信息

Wu Kefan, Yan Yingjie, Cao Rui, Li Xinyu, Jiang Yong, Yang Fei, Jia Xingwang, Chen Jianhong

机构信息

State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, Lanzhou University of Technology, Lanzhou 730050, China.

School of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou 730050, China.

出版信息

Materials (Basel). 2020 Jul 6;13(13):3013. doi: 10.3390/ma13133013.

DOI:10.3390/ma13133013
PMID:32640646
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7372413/
Abstract

The demand for heat-resistant steel has increased owing to its utility in numerous devices that must withstand high steam pressures and high temperatures, such as turbine rotors and blades in ultra-supercritical power plants. It is inevitable to join heat-resistance steel part by welding method, so it is important to maintain the toughness of the weld metals. In this study, the microstructure, low-temperature impact toughness, and fracture surface of as-welded and post-weld heat treatment (PWHT) of 2.25Cr-1Mo-0.25V weld metal were investigated. The microstructures of the as-welded and PWHT specimens are granular bainite and ferrite, respectively. This work revealed the relationship between effective microstructure nearby crack initiation origin and low temperature impact toughness for both the as-welded and PWHT specimens. The evolution of the microstructure and prior austenite was then investigated using confocal laser scanning microscopy (CLSM) to observe the formation of coarse ferrite grain structures. A suggestion for enhancing the low-temperature toughness was provided based on the effect of adjusting Mn content and forming acicular ferrite.

摘要

由于耐热钢在众多必须承受高蒸汽压力和高温的设备（如超超临界发电厂的涡轮转子和叶片）中具有实用性，其需求不断增加。通过焊接方法连接耐热钢部件是不可避免的，因此保持焊缝金属的韧性很重要。在本研究中，对2.25Cr-1Mo-0.25V焊缝金属的焊态和焊后热处理（PWHT）的微观结构、低温冲击韧性和断口进行了研究。焊态和PWHT试样的微观结构分别为粒状贝氏体和铁素体。这项工作揭示了焊态和PWHT试样裂纹萌生起源附近有效微观结构与低温冲击韧性之间的关系。然后使用共聚焦激光扫描显微镜（CLSM）研究微观结构和原始奥氏体的演变，以观察粗大铁素体晶粒结构的形成。基于调整锰含量和形成针状铁素体的效果，提出了提高低温韧性的建议。

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