超高W含量NiW中/重合金热加工行为研究  

Hot Workability of NiW Medium/Heavy Alloys with Ultra-high W Content

作　　者：曹国鑫[1,2] 董建新 张胜[2] 姚志浩 解国良[1] 聂志华[3] 马腾飞[4] 付宝全 Cao Guoxin;Dong Jianxin;Zhang Sheng;Yao Zhihao;Xie Guoliang;Nie Zhihua;Ma Tengfei;Fu Baoquan(School of Materials Science and Engineering,University of Science and Technology Beijing,Beijing 100083,China;Xi’an Superalloy Technology Co.,Ltd,Xian 710299,China;School of Materials Science and Engineering,Beijing Institute of Technology,Beijing 100081,China;Key Laboratory of Air-driven Equipment Technology of Zhejiang Province,Quzhou University,Quzhou 324000,China)

机构地区：[1]北京科技大学材料科学与工程学院,北京100083 [2]西安聚能高温合金材料科技有限公司,陕西西安710299 [3]北京理工大学材料学院,北京100081 [4]衢州学院浙江省空气动力装备技术重点实验室,浙江衢州324000

出　　处：《稀有金属材料与工程》2024年第5期1371-1377,共7页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(51771016)。

摘　　要：采用Gleeble-1500D研究了Ni-42W-10Co-1Mo(质量分数,%)中/重合金(MHA)在1150~1300℃和应变速率0.001~1 s^(-1)下流变行为和微观组织演化规律。结果表明,该合金初始组织由面心立方基体和初生σ相构成。流变应力对变形温度和应变速率敏感,在较高应变速率1s^(-1)下,应力-应变曲线呈现出典型的动态回复软化特征,而在较低应变速率0.1~0.001 s^(-1)下变形应力-应变曲线呈现出典型动态再结晶软化特征。基于应力-应变曲线建立了Arrhenius本构方程,并计算得到Ni-42W-10Co-1Mo合金热变形激活能为446.2 kJ/mol。基于动态材料模型构建该合金热加工图,发现在1300℃高应变速率下存在失稳区。通过微观组织分析,揭示其动态再结晶机制主要为不连续动态再结晶,σ相促进动态再结晶优先在其周围形核。最终优化获得了Ni-42W-10Co-1Mo合金最佳的热加工窗口:1250~1300℃,应变速率0.1~0.01 s^(-1)。The flow behavior and microstructural evolution of a high-density Ni-42W-10Co-1Mo(wt%)alloy were investigated at 1150-1300℃under strain rates of 0.001-1 s^(-1) using a Gleeble-1500D.The results show that the initial microstructure is composed of face-centered cubic matrix andσphase.The flow stress is sensitive to the deformation temperature and strain rate,and the stress-strain curve shows typical dynamic revertive softening characteristics when deformed at 1 s^(-1),while typical dynamic recrystallization softening characteristics are observed when deformed at 0.1-0.001 s^(-1).The Arrhenius equation was established based on the stress-strain curves,and the hot deformation activation energy of the Ni-42W-10Co-1Mo alloy was calculated to be 446.2 kJ/mol.The thermal processing map was constructed based on the dynamic material model to evaluate the thermal processing performance,and the instable zone was located at 1300℃under high strain rate.The deformation microstructural evolution reveals that the dynamic recrystallization mechanism is discontinuous dynamic recrystallization,which preferentially nucleates around theσphase.Finally,the optimized hot working window for Ni-42W-10Co-1Mo alloy was obtained at 1250-1300℃under strain rate of 0.1-0.01 s^(-1).

关 键 词：中重合金 镍基合金 热加工 本构关系 

分 类 号：TG132.3[一般工业技术—材料科学与工程]