利用压缩实验研究铀钼合金热变形行为  

Study of Thermal Deformation Behavior of Uranium-molybdenum Alloys by Compression Experiments

作　　者：胡秉坤 李明阳 何亚斌 杜艳华[1,2] HU Bingkun;LI Mingyang;HE Yabin;DU Yanhua(CNNC Key Laboratory on New Materials Research and Application Development,Baotou 014035,China;China North Nuclear Fuel Co.,Ltd.,Baotou 014035,China)

机构地区：[1]中核新型材料研究与应用开发重点实验室,内蒙古包头014035 [2]中核北方核燃料元件有限公司,内蒙古包头014035

出　　处：《原子能科学技术》2025年第4期884-890,共7页Atomic Energy Science and Technology

摘　　要：为研究铀钼合金压力加工的热变形行为,对铀钼合金压力加工工艺设计提供理论支撑,本文利用Gleeble3800热模拟试验机在变形温度分别为500、600、700℃,应变速率分别为0.01、0.1、1 s-1的条件下对铀钼合金进行单道次压缩实验。通过实验,建立各种温度和应变速率条件下铀钼合金的真应力-真应变曲线,分析温度和应变速率对铀钼合金变形应力的影响,同时对铀钼合金热变形后的微观组织进行分析,建立铀钼合金的本构方程和热加工图。结果表明:铀钼合金在热变形时,其真应力随真应变的增加表现为先快速上升再趋于稳定,热变形后铀钼合金会形成α-U相和Mo2Ux相的双相组织,铀钼合金在热变形时的热变形激活能约590.4 kJ/mol,并通过峰值应力、应变速率和温度构建出和实际较相符的铀钼合金本构方程和热加工图。In order to study the thermal deformation behavior of uranium-molybdenum alloy,and to provide theoretical support for the design of uranium-molybdenum alloy press working,Gleeble3800thermo-mechanical simulator was utilized to perform single-pass compression experiments on uraniummolybdenum alloy in the conditions of deformation temperatures of 500,600,700 ℃,and strain rate of 0.01,0.1,1 s-1.The true stress-true strain curves of uranium-molybdenum alloys were established at various temperatures and strain rates,and the effects of temperature and strain rate on the deformation stress of uranium-molybdenum alloys were analyzed.At the same time,the microstructures of uraniummolybdenum alloys were analyzed after thermal deformation,and the constitutive equations of the uranium-molybdenum alloys and the processing map were established.The results show that the true stress of uranium-molybdenum alloy increases with the true strain and then tends to be stabilized,and a dual-phase organization of α-U and Mo2Ux phases is formed in uranium-molybdenum alloy after thermal deformation.The activation energy of uranium-molybdenum alloy during thermal deformation is about 590.4 kJ/mol.The constitutive equations and the processing map of the alloy which are consistent with practice were constructed with peak stress and strain rate and temperature.

关 键 词：铀钼合金 热变形 温度 应变速率 

分 类 号：TL27[核科学技术—核燃料循环与材料] TG115[金属学及工艺—物理冶金]