刘洋 孙健 陆善平. Mo含量对1000 MPa级高强钢焊缝金属组织和力学性能的影响[J]. 金属学报, 10.11900/0412.1961.2024.00414.

摘要 相关文章 Metrics 全文: PDF(3328 KB)   摘要: 作为焊接接头组成部分的焊缝金属，其组织与性能直接影响焊接结构的应用及服役寿命。目前，国内外钢铁企业已成功开发出1000 MPa级高强钢，但其配套焊接材料强韧性匹配较差，严重制约了该级别高强钢的推广和应用。本工作采用熔化极气体保护电弧焊(GMAW)方法，制备了三种不同Mo含量的1000 MPa级高强钢焊缝金属。利用SEM、EBSD、TEM以及拉伸、冲击等实验手段研究了1000 MPa级高强钢焊缝金属的微观组织和力学性能，阐明了Mo含量对微观组织演变的影响机制。微观组织分析表明，不同Mo含量焊缝金属组织主要为板条贝氏体(LB)和聚合贝氏体(CB)；随着Mo含量的增加，焊缝金属中大角度晶界占比先下降后上升，焊缝金属组织中贝氏体板条形貌从交织状向平行状转变，CB含量增加。力学性能测试结果表明，随着Mo含量的增加，焊缝金属的淬硬性增加，焊缝金属的屈服强度、抗拉强度和硬度均升高，而冲击韧性先降低后略微升高。冲击断口横截面裂纹分析表明，裂纹易穿过CB，CB的存在明显恶化了焊缝金属的冲击韧性。当Mo含量为0.71%时，焊缝金属强韧性匹配最佳，其屈服强度达(939 ± 10) MPa，抗拉强度达(1181 ± 2) MPa，室温冲击功达(60 ± 3) J。 关键词 ： 关键词：1000MPa级焊缝金属,  微观组织,  拉伸性能,  冲击韧性     Abstract：High-strength steels are essential materials in various sectors, such as engineering machinery, marine engineering, and hydropower. Welding is a crucial thermal processing technique for fabricating structural components made of high-strength steels. The weld metal, as a vital component of the welded joint, plays a pivotal role in determining the applicability and service life of weldments through its microstructural characteristics and properties. At present, steel manufacturers globally have developed 1000 MPa grade high-strength steels. However, the welding consumables associated with these steels exhibit inadequate strength–toughness matching, which significantly hinders their widespread adoption. In this study, weld metals of 1000 MPa grade high-strength steels with three different Mo contents were produced via the gas metal arc welding process. A comprehensive investigation of the microstructure and mechanical properties of weld metals of 1000 MPa grade high-strength steels were conducted using SEM, EBSD, TEM, tensile testing, and Charpy impact testing. The influence mechanism of Mo content on the microstructural evolution was elucidated. The microstructural characterization revealed that the weld metals predominantly comprised lath bainite (LB) and coalesced bainite (CB). As the Mo content was increased, the proportion of high-angle grain boundaries initially decreased and then increased. The morphology of LB transitioned from an interwoven structure to a more parallel arrangement, which was accompanied by an increase in the CB content. Mechanical testing revealed that a higher Mo content enhanced the metal hardenability, resulting in increased yield strength, tensile strength, and hardness. In contrast, the impact toughness initially decreased and then slightly increased. Analysis of the crack propagation paths on the cross-sections beneath the impact fracture surfaces demonstrated that the cracks readily propagated through the CB regions. The presence of CB considerably impaired the impact toughness of the weld metals. The optimal balance between strength and toughness in the weld metals was achieved at 0.71% Mo, resulting in a yield strength of (939 ± 10) MPa, a tensile strength of (1181 ± 2) MPa, and a room-temperature impact energy of (60 ± 3) J. Key words： KEYWORDS： 1000 MPa grade deposited metal    microstructure    tensile properties    impact toughness 收稿日期: 2024-12-10      基金资助:国家自然科学基金项目;中国博士后科学基金;中国博士后科学基金 服务 把本文推荐给朋友 加入引用管理器 E-mail Alert RSS 作者相关文章 刘洋 孙健 陆善平 44.8K 链接本文: https://www.ams.org.cn/CN/Y0/V/I/0 [1] 吴泽威, 颜俊雄, 胡励, 韩修柱. 双峰分离非基面织构AZ31镁合金板材反常中温轧制变形行为及机理[J]. 金属学报, 2025, 61(8): 1165-1173. [2] 肖文龙, 臧晨阳, 郭锦涛, 冯佳文, 马朝利. 基于原位电阻法的7A65铝合金厚板双级时效工艺[J]. 金属学报, 2025, 61(8): 1153-1164. [3] 孙欢腾, 马运柱, 蔡青山, 王健宁, 段有腾, 张梦祥. fcc和bcc钢板在超高速撞击下的微观组织差异[J]. 金属学报, 2025, 61(7): 1011-1023. [4] 谢旭, 万一博, 钟明, 邹晓东, 王聪. CaF2-TiO2 焊剂作用下EH36船板钢气电立焊焊缝金属组织优化及力学性能调控[J]. 金属学报, 2025, 61(7): 998-1010. [5] 郝旭邦, 程伟丽, 李戬, 王利飞, 崔泽琴, 闫国庆, 翟凯, 余晖. 低合金化Mg-Ag镁空气电池阳极材料的电化学行为和放电性能[J]. 金属学报, 2025, 61(6): 837-847. [6] 刘子儒, 郭乾应, 张虹雨, 刘永长. V添加对Ti2AlNb合金组织演变及硬度的影响[J]. 金属学报, 2025, 61(6): 848-856. [7] 宋逸思, 廖瑜, 李传维, 陈益华, 顾剑锋. 逆转变奥氏体对0Cr16Ni5Mo1超级马氏体不锈钢低温冲击韧性的影响[J]. 金属学报, 2025, 61(5): 687-698. [8] 杨明辉, 李星吾, 孙崇昊, 阮莹. 定向凝固与固态相变双联协控下Monel K-500合金的组织和力学性能[J]. 金属学报, 2025, 61(4): 561-571. [9] 蒋斌, 张昂, 宋江凤, 黎田, 游国强, 郑江, 潘复生. 镁合金一体化压铸缺陷控制[J]. 金属学报, 2025, 61(3): 383-396. [10] 黄科, 李新志, 方学伟, 卢秉恒. 镁合金电弧熔丝增材制造技术研究现状与展望[J]. 金属学报, 2025, 61(3): 397-419. [11] 戴进财, 闵小华, 辛社伟, 刘凤金. 间隙元素O对 β 型Ti-15Mo合金超低温力学性能的影响[J]. 金属学报, 2025, 61(2): 243-252. [12] 郭星星, 帅美荣, 楚志兵, 李玉贵, 谢广明. 不锈钢复合钢筋近界面微观组织演变及元素扩散动力学[J]. 金属学报, 2025, 61(2): 336-348. [13] 王旗涛, 李艳芬, 张家榕, 李尧志, 付海阳, 李新乐, 严伟, 单以银. 聚变增殖包层用低活化9Cr-ODS钢的室温低周疲劳行为[J]. 金属学报, 2025, 61(2): 323-335. [14] 张胜煜, 马庆爽, 余黎明, 张竟文, 李会军, 高秋志. 预时效处理对冷轧含Al奥氏体耐热钢组织和性能的影响[J]. 金属学报, 2025, 61(1): 177-190. [15] 王叶青, 付珂, 赵永柱, 苏礼季, 陈正. Fe7(CoNiMn)80B13 共晶高熵合金的深过冷非平衡凝固行为及微观组织演变[J]. 金属学报, 2025, 61(1): 143-153. Viewed Full text Abstract Cited   Shared      Discussed