扫 描 看 全 文
刘红宁，王艳俊，杨上陆，等.焊后热处理对中锰TRIP钢激光焊接接头组织及力学性能的影响［J］.电焊机，2023，53（7）：9-15.
LIU Hongning, WANG Yanjun, YANG Shanglu, et al.Post-weld Heat Treatment Improves the Mechanical Properties of Laser Welded Joints of Medium Manganese TRIP Steel[J].Electric Welding Machine, 2023, 53(7): 9-15.
为解决中锰钢焊接接头的脆性断裂问题，研究了焊后热处理工艺对厚度为1.6 mm的中锰TRIP钢激光自熔焊接接头组织、静态力学性能以及锰元素分布的影响，热处理温度选择Ac1（奥氏体开始转变温度）和Ac3（奥氏体转变终止温度）之间，这和中锰钢轧制温度是相同的，可以保证更高的强度和韧性。研究结果表明：焊态试样焊缝区主要为马氏体组织，热处理后焊缝主要组织为回火马氏体，并伴有碳化物析出；在620 ℃热处理3 min后，焊接接头抗拉强度无明显提高，但延伸率相对于焊态接头提高了1 959.2%，主要原因是热处理缓解了锰元素在晶界上的偏析。焊态接头失效断口为典型的脆性断裂，并出现了较多的二次晶间裂纹，热处理后的接头失效断口出现了较多的凹坑和韧窝，呈现良好的韧性断裂特征。在热处理后试样的应力应变曲线中发现了二次屈服，通过VIC-3D数字图像关联（DIC）技术发现这是吕德斯带穿越焊缝遇到硬度较高的马氏体组织导致应力突增所致，最终在母材处发生颈缩并断裂。
To solve the problem of brittle fracture in welded joint of medium manganese steel, this article studied the effect of post-weld heat treatment process on the microstructure, static mechanical properties, and distribution of manganese element of laser self-melting welded joint of 1.6 mm thick medium manganese TRIP steel. The heat treatment temperature was selected between Ac1 (austenite start transformation temperature) and Ac3 (austenite transformation termination temperature), which is the same as the rolling temperature of medium manganese steel, to ensure higher strength and toughness. The results showed that the weld zone of the as-welded sample was mainly composed of martensitic structure, while the weld zone after heat treatment was mainly composed of tempered martensite with carbide precipitation. After being heated at 620 ℃ for 3 minutes, the tensile strength of the welded joint did not increase significantly, but the elongation of the welded joint increased by 1959.2% relative to that of the as-welded joint. The main reason was that the heat treatment relieved the segregation of manganese element at grain boundaries. The failed fracture of the as-welded joint was a typical brittle fracture, with more secondary intergranular cracks. The failed fracture of the heat-treated joint showed more pits and toughness dimples and presented good toughness fracture characteristics. A secondary yield was found in the stress-strain curve of the heat-treated sample, and through the VIC-3D digital image correlation (DIC) technology, it was found that this was caused by the Lüders band encountering the martensitic structure with higher hardness across the weld zone, leading to a sudden increase in stress and ultimately causing necking and fracture at the base metal.
中锰TRIP钢激光焊接焊后热处理力学性能Mn元素偏析
medium manganese TRIP steellaser weldingpost-weld heat treatmentmechanical propertyMn element segregation
王兆，保翔，郑天雷，等.2020年乘用车燃料消耗量标准及其应对方案分析［J］.节能，2015，34（09）：4-10.
WANG Z， BAO X， ZHENG T L， et al. Analysis of fuel consumption standards for passenger cars in 2020 and their countermeasures［J］. Energy conservation， 2015，34（09）： 4-10.
白颐，马捷，乔冰，等.化工新材料应用于我国汽车轻量化的机会分析——赴德国赢创工业集团考察的启示［J］.化学工业，2018，36（01）：43-47.
BAI Y， MA J， QIAO B， et al. Opportunity analysis of the application of new chemical materials to the lightweight of automobiles in China-Inspiration from the investigation of Yingchuang Industrial Group in Germany ［J］. Chemical Industry， 2018，36（01）： 43-47.
范子杰，桂良进，苏瑞意.汽车轻量化技术的研究与进展［J］.汽车安全与节能学报，2014，5（01）：1-16.
FAN Z J， GUI L J， SU R Y. Research and progress of automotive lightweight technology［J］. Automotive Sa-fety and Energy Saving Journal， 2014，5（01）： 1-16.
Li Y， Li W， Liu W Q， et al. The austenite reversion and co-precipitation behavior of an ultra-low carbon medium manganese quenching-partitioning-tempering steel［J］. Acta Materialia，2018，146： 126-141.
Kuzmina M， Ponge D， Raabe D. Grain boundary segregation engineering and austenite reversion turn embrittlement into toughness： Example of a 9 wt.% medium Mn steel［J］. Acta Materialia，2015，86： 182-192.
曹洋，赵琳，彭云，等.热输入对激光焊中锰TRIP钢接头组织和力学性能的影响［J］. 中国激光， 2018， 45（11）：83-91.
CAO Y， ZHAO L， PENG Y， et al. Effect of heat input on microstructure and mechanical properties of laser welded medium manganese TRIP steel joints［J］. China Laser， 2018，45（11）： 83-91.
Cao Y， Zhao L， Peng Y， et al. Microstructure and Mechanical Properties of Simulated Heat Affected Zone of Laser Welded Medium-Mn Steel［J］. ISIJ International，2020，60（10）：1-10.
Chen R， Kong H J， Luan J H， et al. Effect of external applied magnetic field on microstructures and mechanical properties of laser welding joint of medium-Mn nanostructured steel［J］. Materials Science & Engineering A，2020，792：139787.
Lun N. Laser Welding of Medium-Manganese Steel［D］. Canada： University of Waterloo， 2016.
Messmer R P， Briant C L. The role of chemical bonding in grain boundary embrittlement［J］. Acta Metall， 1982，30： 457-467.
Ding K， Wang Y F， Wei T， et al. Effect of Post-weld Heat Treatment on the Cross Tensile Strength of Resistance Spot-Welded Medium Manganese Steel［J］. Journal of Materials Engineering and Performance，2021，30： 6107-6119.
Zhao B G， Wang Y F， Ding K， et al. Role of Intercritical Annealing in Enhancing the Cross-Tension Property of Resistance Spot-Welded Medium Mn Steel［J］. Journal of Materials Engineering and Performance，2021，30： 1259-1269.
刘腾. 0.13C-6.98Mn中锰TRIP钢电阻点焊工艺及焊点组织力学性能研究［D］.江西：南昌大学，2021.
LIU T. Study on resistance spot welding process， microstructure and mechanical properties of medium manganese TRIP steel ［D］. Jiangxi： Nanchang University， 2021.
Ryu J H， Kim J I， Kim H S， et al. Austenite stability and heterogeneous deformation in fine-grained trans-formation-induced plasticity-assisted steel［J］. Scripta Materialia，2013，68（12）： 933-936.
Liu L， Yu Qin， Wang Z， et al. Making ultrastrong steel tough by grain-boundary delamination［J］. Science （New York， N.Y.），2020，368：1347-1352.
编辑部网址：http：//www.71dhj.comhttp://www.71dhj.com
相关作者
相关机构
公网安备11010802024621