建筑钢结构进展2025，Vol.27Issue(11)：45-56,12.DOI:10.13969/j.jzgjgjz.20240520001
火焰切割后局部钢材力学性能研究
Investigation on Mechanical Properties of Steel Materials in the Local Region Produced by Flame Cutting
宗亮 1虞永博2
作者信息
- 1. 天津大学 建筑工程学院,天津 300354||天津大学 滨海土木工程结构与安全教育部重点实验室,天津 300354
- 2. 天津大学 建筑工程学院,天津 300354
- 折叠
摘要
Abstract
Flame cutting is often used to complete the process when the steel structures reach their service life or when need to be disassembled due to the change of use function.Under the influence of flame cutting heat,the microstructure and mechanical properties of the thermally cut surface will be changed.If the disassembled components by flame cutting are used again,it is necessary to evaluate the local microstructure and mechanical properties after flame cutting.In this study,after manual flame cutting and semi-automatic cutting machine flame cutting,the heat-affected zone width and metallographic structure of domestically produced Q355B steel were observed and analyzed.Quantitative research was also conducted on the mechanical properties of the base metal and the heat-affected zone.The results show that the heat-affected zone width after manual flame cutting of 20mm thick Q355B steel is approximately 3.4mm,while it is approximately 3mm after semi-automatic cutting.Both types of flame cutting have insignificant effects on the yield strength and tensile strength of Q355B steel.However,they can shorten or even eliminate the yield plateau of the stress-strain curve.The ductile-brittle transition temperature of the heat-affected zone of Q355B steel is almost unaffected,with a slight reduction in the transition zone and a small increase in energy absorption of the upper and lower platforms.The characteristic value of crack tip opening displacement(CTOD)remains essentially unchanged.This indicates that the mechanical properties of steel after flame cutting do not significantly decrease,demonstrating strong reusability.This study provides data support for the reuse of steel after flame cutting.关键词
火焰切割/热影响区/静力拉伸/断裂韧性/钢材再利用/韧脆转变温度/裂纹尖端张开位移Key words
flame cutting/heat-affected zone/static tensile strength/fracture toughness/reusable steel/ductile-brittle transition temperature/crack tip opening displacement(CTOD)分类
建筑与水利引用本文复制引用
宗亮,虞永博..火焰切割后局部钢材力学性能研究[J].建筑钢结构进展,2025,27(11):45-56,12.
