多组元Fe-W-B合金本构方程及热加工图的研究  

Study on constitutive equation and thermal processing diagram of multi-component Fe-W-B alloy

作　　者：万俊杉 刘颖[1,2] 陈康为 刘畅 李军[1,2] WAN Junshan;LIU Ying;CHEN Kangwei;LIU Chang;LI Jun(School of Materials Science and Engineering,Sichuan University,Chengdu 610065,China;Key Laboratory of Advanced Special Material&.Technology,Ministry of Education,Sichuan University,Chengdu,610065,China)

机构地区：[1]四川大学材料科学与工程学院,四川成都610065 [2]四川大学先进特种材料教育部重点实验室,四川成都610065

出　　处：《四川冶金》2023年第4期7-13,共7页Sichuan Metallurgy

基　　金：四川省重大科技专项(2019ZDZX001-4);稀土钒钛功能新材料研究及应用(2020SCUNG201)。

摘　　要：为解决铸造高硼合金难热加工以及硼化物呈网状分布的问题,本文以多组元Fe-W-B合金为例,采用Gleeble-3500热模拟实验机研究了其在变形温度800℃~1150℃、应变速率0.01s-1~10s-1条件下的高温流变行为。结果表明,多组元Fe-W-B合金的高温流变应力状态主要受温度和应变速率影响,具体表现为流变应力随着应变速率降低和变形温度升高而减小,真应力一应变曲线表现出动态回复型和动态再结晶型特征。本文还构建了Arrhenius型热变形本构方程并对其准确性进行了验证;根据热加工图确定了多组元Fe-W-B合金最佳热加工窗口并进行锻造验证。锻后,多组元Fe-W-B合金中的网状硼化物被有效破碎并且力学性能大幅提升。To address the problems of difficult hot working and reticulated borides in cast high boron alloys.In this paper,the high temperature flow stress behaviors of a multi-component Fe-W-B alloy was investigated at deforma-tion temperatures of 800℃to 1150℃and strain ratesof0.01s-1to 10s-1by usingGleeble-3500thermal simulator.The results show that the high temperature flow stress state of the multi-component Fe-W-B alloy is mainly influ-enced by temperature and strain rate.Specifically,the flow stress decreases with decreasing strain rate and increas-ing deformation temperature,and the true stress-strain curve shows dynamic reversion type and dynamic recrystalli-zation type.In this paper,the Arrhenius thermal deformation constitutive equation is constructed and its accuracy is verified.According to the hot working diagram,the optimal hot working window of multi-component Fe-W-B alloy was determined and verified by forging test.After forging,the reticulated borides in the multi-component Fe-W-B alloy are effectively broken and the mechanical properties are greatly improved.

关 键 词：多组元Fe-W-B合金 热压缩 流变应力 本构方程 热加工图 

分 类 号：TG142.72[一般工业技术—材料科学与工程] TG142.41[金属学及工艺—金属材料]