退火温度和冷拔变形量对Ni30合金组织性能的影响  

Effect of annealing temperature and cold drawing deformation on microstructure and properties of Ni30 alloy

作　　者：吴畏 何曲波 莫燕[4,5] 张洁柯 李艳琳 曾煜 WU Wei;HE Qu-bo;MO Yan;ZHANG Jie-ke;LI Yan-lin;ZENG Yu(Chongqing Materials Research Institute Co Ltd,Chongqing 400707,China;National Engineering Research Center for Instrument Functional Materials,Chongqing 400707,China;Chongqing Key Laboratory of Corrosion-resistant Alloys,Chongqing 400707,China;Department of Criminal Technology,Sichuan Police College,Luzhou 646000,China;Intelligent Policing Key Laboratory of Sichuan Province,Luzhou 646000,China;College of Materials Science and Engineering,Chongqing University,Chongqing 400044,China;Department of Mechanical Engineering,Luzhou Vocational and Technical College,Luzhou 646000,China)

机构地区：[1]重庆材料研究院有限公司,重庆400707 [2]国家仪表功能材料工程技术研究中心,重庆400707 [3]耐腐蚀合金重庆市重点实验室,重庆400707 [4]四川警察学院刑事技术系,四川泸州646000 [5]智能警务四川省重点实验室,四川泸州646000 [6]重庆大学材料科学与工程学院,重庆400044 [7]泸州职业技术学院机械工程学院,四川泸州646000

出　　处：《材料热处理学报》2023年第10期137-144,共8页Transactions of Materials and Heat Treatment

基　　金：国家重点研发计划(2021YFB3703000);中国机械工业集团重大科技专项(SINOMAST-ZDZX-2019-03);智能警务四川省重点实验室资助项目(ZNJW2022ZZMS005)。

摘　　要：采用扫描电镜、X射线衍射以及电子背散射衍射技术等研究了不同再结晶退火温度和不同冷拉拔变形量对小规格气阀用Ni30合金线棒材组织性能的影响。结果表明:在1020℃再结晶退火后,能够消除合金热轧组织的加工硬化效应,降低显微硬度,晶界碳化物完全溶解,晶粒均匀细小,有利于后续的冷拉拔变形。随着冷拉拔变形量的增大,退火态合金的原始奥氏体晶粒中产生大量形变孪晶组织,变形晶粒由<001>//拉拔方向取向逐渐转变为<111>//拉拔方向取向。当变形量达到60.3%时,变形组织整体呈现出纤维状特征,奥氏体晶粒被分割成为若干孪晶-母相片层结构。综合考虑材料性能和加工难度,拉拔变形量的选择不宜超过56.4%。Effect of different recrystallization annealing temperatures and cold drawing deformations on microstructure and properties of Ni30 alloy wire bars for small-sized gas valves was studied by means of scanning electron microscopy,X-ray diffraction and electron backscatter diffraction technique.The results show that after recrystallization annealing at 1020℃,the work hardening effect of the hotrolled microstructure of the alloy can be eliminated,the microhardness can be reduced,the grain boundary carbides can be completely dissolved,and the grains are uniform and fine,which is conducive to subsequent cold drawing deformation.With the increase deformation of cold drawing,a large number of deformation twin structures are generated in the primary austenite grains of the annealed alloy,and the orientation of the deformed grains gradually changes from<001>//drawing direction to<111>//drawing direction.When the deformation reaches 60.3%,the deformed microstructure exhibits a fibrous structure as a whole,and the austenite grains are divided into several twin parent layer structures.Considering the material properties and processing difficulty,the selection of drawing deformation should not exceed 56.4%.

关 键 词：Ni30合金 再结晶退火 冷拉拔 形变孪晶 加工硬化 

分 类 号：TG132.3[一般工业技术—材料科学与工程]