铸态06Cr18Ni11Ti钢的热变形及动态再结晶模型  

Hot deformation and dynamic recrystallization model of as-cast 06Cr18Ni11Ti steel

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作  者:林苑 袁武华[1] Lin Yuan;Yuan Wuhua(College of Materials Science and Engineering,Hunan University,Changsha 410082,China)

机构地区:[1]湖南大学材料科学与工程学院,湖南长沙410082

出  处:《锻压技术》2024年第10期230-237,共8页Forging & Stamping Technology

摘  要:采用数值模拟和热压缩试验,研究了铸态06Cr18Ni11Ti钢的热变形行为,构建了其高温流变本构方程,并基于微观组织、加工硬化率建立了动态再结晶模型。将得到的模型导入Deform有限元模拟软件,对双锥试样热压缩试验过程进行了仿真验证。结果表明:高温低应变速率条件下,流变曲线呈常见的动态再结晶型;应变速率较大(1s^(-1))或温度较低(850℃)时,热压缩过程中流变曲线虽呈现加工硬化型,但实际存在动态再结晶现象。构建了包括临界应变模型、动态再结晶体积分数模型及动态再结晶晶粒尺寸模型在内的动态再结晶模型,最终仿真计算结果与双锥试验结果吻合较好,建立的模型能较好地预测铸态06Cr18Ni11Ti钢锻造过程的动态再结晶。The hot deformation behavior of as-cast 06Cr18Ni11Ti steel was studied by numerical simulation and hot compression experi-ments,the high-temperature rheological constitutive equation was constructed,and the dynamic recrystallization model was established based on the microstructure and work hardening rate.Then,the obtained model was imported into finite element simulation software Deform,and the hot compression experiment process of bipyramidal specimen was simulated and verified.The results show that the rheo-logical curve is DRX type under the condition of high temperature and low strain rate.At high strain rates (1 s^(-1)) or low temperatures(850℃),the rheological curve during hot compression appear to be work hardening,but the dynamic recrystallization phenomenon actu-ally exists.The dynamic recrystallization model was constructed,including the critical strain model,the dynamic recrystallization volume fraction model and the recrystallization grain size model.At last,the calculated results of simulation are in good agreement with the results of bipyramidal experiment,and the established model can effectively predict the dynamic recrystallization of as-cast 06Cr18Ni11Ti steel during the forging process.

关 键 词:06Cr18Ni11Ti钢 热变形 动态再结晶 本构方程 双锥试样 

分 类 号:TG142.1[一般工业技术—材料科学与工程]

 

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