连续应变分布Maraging250钢的动态再结晶行为  

Dynamic recrystallization behavior on continuous strain distribution for Maraging250 steel

作　　者：韩顺[1] 尚丽梅 厉勇[1] 王建国[2] 高茜 王春旭[1] Han Shun;Shang Limei;Li Yong;Wang Jianguo;Gao Xi;Wang Chunxu(Institute of Special Steels,Central Iron and Steel Research Institute Co.,Ltd.,Beijing 100081,China;School of Materials Science and Engineering,Northwest Polytechnical University,Xi′an 710072,China;AECC Aviation Power Co.,Ltd.,Xi′an 710021,China)

机构地区：[1]钢铁研究总院有限公司特殊钢研究院,北京100081 [2]西北工业大学材料学院,陕西西安710072 [3]中国航发动力股份有限公司,陕西西安710021

出　　处：《锻压技术》2023年第6期231-237,共7页Forging & Stamping Technology

基　　金：国家重点研发计划资助项目(2022YFB3705204)。

摘　　要：通过设计高通量双锥试样,在单个热压缩试样的不同区域产生梯度应变,研究了1020~1150℃变形温度下Maraging250钢的动态再结晶(DRX)行为。采用有限元数值模拟、光学显微镜和电子背散射衍射技术,定量分析了各双锥变形试样垂直截面中心线附近的显微组织,确定了DRX的含量,建立了不同变形温度下Maraging250钢的动力学曲线。结果表明:将双锥试样热压缩后,等效应变沿垂直截面中心线呈连续对称分布,应变从边缘到心部逐渐增大至1.7,内部变形温度基本稳定在972~985℃。在热压缩过程中,Maraging250钢发生了连续应变DRX,其动力学曲线表现为典型的“S”形特征,DRX体积分数在变形中期增长速率最高,在变形初期及末期增速缓慢。随着变形温度的升高,DRX形核过程所需的应变有所降低,DRX体积分数最大增长率明显升高,但各变形温度下完全DRX所需的应变量变化较小。The dynamic recrystallization(DRX)behavior of Maraging250 steel at temperature of 1020-1150℃was studied by designing high-flux biconical specimen and producing gradient strains in different regions of one single thermal compression specimen.Then,the microstructure near the center line of the vertical section of each biconical deformed specimens was quantitatively analyzed by finite element numerical simulation,optical microscope(OM)and electron backscatter diffraction(EBSD)technology,the content of DRX was determined,and the kinetic curves of Maraging250 steel at different deformation temperatures were established.The results show that after thermal compression of the biconical specimen,the equivalent strain is continuously and symmetrically distributed along the center line of the vertical section,the strain gradually increases to 1.7 from the edge to the center,and the internal deformation temperature is basically stable at 972-985℃.During the thermal compression process,continuous strain DRX occurs in Maraging250 steel and its kinetic curves show a typical‘S’shape feature.DRX volume fraction increases at the highest rate in the middle stage of deformation,and the growth rate is slow in the early and late stages of deformation.With the increasing of deformation temperature,the strain required for the nucleation process of DRX decreases,and the maximum growth rate of DRX volume fraction increases obviously,but the strain required for complete DRX changes slightly at each deformation temperature.

关 键 词：Maraging250钢 双锥试样 应变 动态再结晶 微观组织 

分 类 号：TG311[金属学及工艺—金属压力加工]