冷拔变形量对高铌奥氏体不锈钢中初生碳化物形貌和分布的影响  

Effect of Cold Drawing Strain on Morphology and Distribution of Primary Carbides in High Nb Austenitic Stainless Steel

作　　者：宋欣澎 张舒展 商宁波[2] 史显波[2] 严伟[2] 管建军[1] SONG Xinpeng;ZHANG Shuzhan;SHANG Ningbo;SHI Xianbo;YAN Wei;GUAN Jianjun(School of Mechanical Engineering,Liaoning Petrochemical University,Fushun 113001,China;Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China;School of Materials Science and Engineering,University of Science and Technology of China,Shenyang 110016,China)

机构地区：[1]辽宁石油化工大学机械工程学院,抚顺113001 [2]中国科学院金属研究所,沈阳110016 [3]中国科学技术大学材料科学与工程学院,沈阳110016

出　　处：《机械工程材料》2023年第12期51-55,共5页Materials For Mechanical Engineering

基　　金：辽宁省教育厅基本科研项目(LJKZ0385)。

摘　　要：对热锻态高铌奥氏体不锈钢进行不同变形量(0,0.45,0.71,1.02)的冷拔+固溶处理,研究了冷拔变形量对试验钢中初生碳化物形貌和分布的影响,并分析了其影响机理。结果表明:试验钢组织为奥氏体+粗大NbC,冷拔变形可以有效破碎NbC;提高冷拔变形量有利于NbC细化,弥散性增强,但变化幅度减小;相同冷拔变形量下,试验钢边部的NbC比心部的尺寸更小,弥散性更强;冷拔细化NbC的机理主要是NbC塑性与奥氏体基体相差较大,导致变形无法保持一致,在应力集中和位错滑移的共同作用下,沿冷拔方向产生机械破碎。The hot forged high Nb austenitic stainless steel was treated by cold drawing with different strains(0,0.45, 0.71, 1.02) and solution treatment. The effect of cold drawing strain on the morphology and distribution of primary carbides were studied, and the influence mechanism was analyzed. The results show that the microstructure of the test steel consisted of anstenite and coarse NbC, and cold drawing could refine NbC effectively. Increasing the cold drawing strain was beneficial to refine NbC, enhance its dispersion, but the range of change was reduced. Under the same cold drawing strain, the NbC at the test steel edge was smaller and more dispersive than that at the core. The large difference between the ductility of NbC and the austenitic matrix, resulting in the incoordinate of the deformation. Under the combination of stress concentration and dislocation slip, mechanical breaking of NbC occured along the cold drawing direction. That was the refining mechanism of NbC during cold drawing.

关 键 词：奥氏体不锈钢 碳化铌 冷拔 细化 

分 类 号：TG142.11[一般工业技术—材料科学与工程]