极地低温下高强钢对接焊缝连接力学性能  

Behavior of High Strength Steel Butt Joints at Arctic Low Temperatures

作　　者：曹换 蔡骜 谌扬宇 左文康 陈满泰 CAO Huan;CAI Ao;CHEN Yangyu;ZUO Wenkang;CHEN Mantai(State Key Laboratory of Ocean Engineering,Department of Civil Engineering,Shanghai Jiao Tong University,Shanghai 200240,China)

机构地区：[1]上海交通大学海洋工程国家重点实验室,土木工程系,上海200240

出　　处：《上海交通大学学报》2025年第4期533-540,共8页Journal of Shanghai Jiaotong University

基　　金：国家自然科学基金(52378167,52108157);上海市自然科学基金(21ZR1429000)资助项目。

摘　　要：为研究极地低温环境对HG785高强钢对接焊缝连接的力学性能影响机制与规律,考虑两种焊缝金属材料和5种常温或低温环境温度,对高强钢对接焊缝焊接接头开展了微观结构观测、硬度分布测试和单轴拉伸试验研究.结果表明,焊接接头金相组织较为连贯,焊缝金属与母材熔合良好;两种匹配情况的焊缝连接试样均仅存在软化热影响区;极地低温环境下的对接焊缝连接试件强度较常温试件有所提升,等强匹配试件延性提升明显,但对高强匹配试件延性影响甚微,所有试件均为延性破坏.研究结果可为高强钢结构在极地低温地区的工程应用与安全服役提供科学依据.To study the effect of Arctic low temperatures on the behavior of HG785 high strength steel butt joints,the microstructure observation,hardness distribution tests,and uniaxial tensile tests were performed on the butt joints fabricated by using two types of weld metals with exposure to five ambient and low temperatures.The results show that the butt joints possess a coherent metallographic structure and exhibit good fusion between weld metal and base metal.Only a softening heat affected zone is observed in the weld joint samples under two matching conditions.The butt joint tensile specimens exposed to Arctic low temperatures possess higher strengths compared to those at ambient temperatures.The ductility improvement due to low-temperature exposure for equal-matching welded butt joint is substantial,whilst that for over-matching welded butt joints is negligible.All butt joint tensile specimens fail in a ductile manner.The findings provide a scientific basis for the engineering applications of high strength steel structures in Arctic low-temperature regions.

关 键 词：高强钢 对接焊缝 微观组织观测 硬度测试 低温材性 

分 类 号：TU391[建筑科学—结构工程]