强制冷却对搅拌摩擦加工QP1180钢组织与力学性能的影响  

Effect of forced cooling on microstructure and mechanical properties of friction stir processed QP1180 steel

作　　者：王佳 乔柯[1,2] 王文 张婷[1,2] 郝政扬 王快社 WANG Jia;QIAO Ke;WANG Wen;ZHANG Ting;HAO Zheng-yang;WANG Kuai-she(School of Metallurgical Engineering,Xi’an University of Architecture and Technology,Xi′an 710055,China;National and Local Joint Engineering Research Center for Functional Materials Processing,Xi′an 710055,China)

机构地区：[1]西安建筑科技大学冶金工程学院,陕西西安710055 [2]功能材料加工国家地方联合工程研究中心,陕西西安710055

出　　处：《塑性工程学报》2023年第8期228-234,共7页Journal of Plasticity Engineering

基　　金：国家自然科学基金重点资助项目(52034005);国家自然科学基金面上资助项目(51974220);国家自然科学基金青年基金资助项目(52104383);陕西省教育厅青年创新团队建设项目(21JP058)。

摘　　要：分别在空气和液态CO_(2)强制冷却条件下对QP1180钢进行了搅拌摩擦加工(FSP),采用OM、SEM、EBSD和TEM技术研究了加工区微观结构特征和力学性能。结果表明,在空气和强制冷却条件下,FSP加工后QP1180钢内部均形成了细小的铁素体和马氏体,其中铁素体含量分别为13%和20%,晶粒尺寸分别为1.7和0.9μm,位错密度分别为1.84×10^(14)和2.53×10^(14) m^(-2)。在空气冷却条件下,FSP加工后QP1180钢的抗拉强度和伸长率分别为1450 MPa和15%。与空气冷却条件下相比,强制冷却条件下FSP加工后QP1180钢的抗拉强度和伸长率分别提高至1640 MPa和28%。在空气和强制冷却条件下,FSP后QP1180钢的断裂方式分别呈现出韧脆混合型和韧性断裂特征。Friction stir processing(FSP)of QP1180 steel was carried out under air and liquid CO_(2) forced cooling conditions.The microstructure characteristics and mechanical properties of the processing zones were studied by OM,SEM,EBSD and TEM.The results show that fine ferrite and martensite are formed in QP1180 steel after FSP under air and forced cooling conditions.The ferrite contents are 13% and 20%,the grain sizes are 1.7 and 0.9μm,and the dislocation densities are 1.84×10^(14) and 2.53×10^(14) m^(-2),respectively.Under air cooling condition,the tensile strength and elongation of QP1180 steel processed by FSP are 1450 MPa and 15%,respectively.Compared with air cooling condition,the tensile strength and elongation of QP1180 steel under forced cooling condition after FSP increase to 1640 MPa and 28%,respectively.Under air and forced cooling conditions,the fracture modes of QP1180 steel after FSP present ductile-brittle mixed and ductile fracture characteristics,respectively.

关 键 词：强制冷却 搅拌摩擦加工 QP1180钢 微观组织 力学性能 

分 类 号：TG457.11[金属学及工艺—焊接]