摘要
采用熔化极气体保护焊堆焊Q345钢基复合板,利用光学显微镜、维氏硬度计、冲击试验机和扫描电镜对试样进行显微组织、维氏硬度、冲击韧性以及断口等试验观察及分析。结果表明:堆焊复合板外观质量良好,无明显焊接缺陷,从基板至堆焊高强层的组织由块状铁素体和条带状珠光体变化为颗粒状铁素体和珠光体,到表层呈块状铁素体和团絮状石墨;焊后硬度存在跃升台阶,分布较均匀,冲击韧性高达64 J/cm^2,正火与淬火处理试样的冲击断口为韧性断裂和准解理断裂。制备的Q345钢基复合板硬度高,冲击韧性良好,具有一定的科学研究价值和应用前景。
The Q345 steel base composite plate is surfaced with melting electrode gas shielded welding. The microstructure,microhardness distribution, Vickers hardness, impact toughness and fracture were observed and analyzed by optical microscope,Vickers hardness tester,impact tester and SEM. The results show that surfacing clad plate has good appearance quality and no obvious welding defects,the microstructure changes from the substrate to the high strength layer,from bulk ferrite and striped pearlite to granular ferrite and pearlite,and the final skin layer are block ferrite and flocculent graphite. After welding,the hardness value has a jump step,and the distribution is uniform. The impact toughness can reach up to 64 J/cm^2.Besides,the impact fracture specimens treated by normalizing and quenching are ductile fracture and quasi-cleavage fracture,respectively. The Q345 steel-based composite plate prepared in this paper has high hardness and good impact toughness,which has important scientific research value and application prospect.
作者
张紫凌
卢立伟
李艺权
杨原凯
谭毅
伏明珠
马旻
ZHANG Ziling;LU Liwei;LI Yiquan;YANG Yuankai;TAN Yi;FU Mingzhu;MA Min(School of Material Science and Engineering,Hunan University of Science and Technology,Xiangtan 411201,China;Gree Electric Appliences Inc of Zhuhai,Zhuhai 519070,China;Hunan Provincial Overseas-wisdom Innovation Center of New Energy Vehicle in Industrial-Academic-Research Cooperation,Hunan University of Science and Technology,Xiangtan 411201,China)
出处
《兵器材料科学与工程》
CAS
CSCD
北大核心
2020年第1期57-61,共5页
Ordnance Material Science and Engineering
基金
国家自然科学基金（51975207）
湖南省自然科学基金优秀青年项目（2019JJ30010）
湖南省教育厅资助项目(17B089)
关键词
Q345钢
堆焊复合板
硬度
冲击韧性
Q345 steel
built-up welding plate
hardness
impact toughness
