Fe-28Mn-10Al-1C-3Cu轻质钢的热变形行为及热加工图  

Thermal deformation behavior and hot processing map of Fe-28Mn-10Al-1C-3Cu lightweight steel

作　　者：任喜强 王程昊 齐艳飞 李运刚 吴志杰 REN Xiqiang;WANG Chenghao;QI Yanfei;LI Yungang;WU Zhijie(College of Metallurgy and Energy,North China University of Science and Technology,Tangshan 063210,Hebei,China;Alstom Sifang(Qingdao)Transportation Co.,Ltd.,Qingdao 266109,Shandong,China;College of Mechanical Engineering,North China University of Science and Technology,Tangshan 063210,Hebei,China)

机构地区：[1]华北理工大学冶金与能源学院,河北唐山063210 [2]青岛四方阿尔斯通铁路运输设备有限公司,山东青岛266109 [3]华北理工大学机械工程学院,河北唐山063210

出　　处：《中国冶金》2024年第4期88-95,共8页China Metallurgy

基　　金：国家自然科学基金资助项目(51974129);河北省自然科学基金资助项目(E2021209099)。

摘　　要：在“双碳”战略目标背景下,通过降低汽车重量来实现减少汽车尾气排放量,有助于该目标的早日实现。为此,研究者们将研究重心聚焦于高强度低密度汽车用钢的研发中。虽然高强度Fe-Mn-Al-C奥氏体轻质钢具有优异的综合性能及显著的减重效果,且在汽车行业备受关注,发展前景非常明朗,但是该钢的屈服强度和抗氢脆断裂性能仍需要进一步提升。通过在Fe-Mn-Al-C奥氏体轻质钢中添加Cu元素可以改善上述问题。为研究含Cu奥氏体轻质钢的高温变形行为,采用Gleeble-3500热模拟试验机对锻态Fe-28Mn-10Al-1C-3Cu奥氏体轻质钢进行了单向热压缩试验,其中应变速率为0.01~10 s^(-1),变形温度为850~1100℃,应变量为0.6,通过试验得到了Fe-28Mn-10Al-1C-3Cu奥氏体轻质钢的流变行为。结果表明,在相同应变速率下,应力随变形温度的升高而降低;在相同变形温度下,应力随应变速率的增加而增加。根据所得真应力-应变曲线并结合Arrhenius模型和Zener-Hollomon模型,构建了Fe-28Mn-10Al-1C-3Cu奥氏体轻质钢的热变形本构方程。基于动态材料模型及Prasad塑性失稳准则计算出了轻质钢的能量耗散图和流变失稳图,并将两者叠加绘制了轻质钢的热加工图,确定了轻质钢适宜的热加工工艺区域,即区域I为应变速率0.01~0.08 s^(-1)、变形温度975~1025℃,区域II为应变速率0.01~0.76 s^(-1)、变形温度1050~1100℃。上述研究结果可为含Cu奥氏体轻质钢热加工工艺参数确定及热加工工艺处理提供一定的理论指导。Under the"dual carbon"strategy objective,reducing vehicle weight to achieve a reduction in vehicle exhaust emissions will help achieve this goal as soon as possible.Therefore,researchers focus research on the development of high-strength low-density automotive steel.Although high-strength Fe-Mn-Al-C austenitic lightweight steel has received much attention in the automotive industry due to its excellent comprehensive properties and significant weight reduction effect,and has a wide open future development opportunity,its yield strength and hydrogen embrittlement fracture resistance still need to be further improved.The above-mentioned problems can be improved by adding Cu element in Fe-Mn-Al-C austenitic lightweight steel.In order to study the high-temperature deformation behavior of Fe-Mn-Al-C-Cu austenitic lightweight steel,unidirectional hot compression tests on forged Fe-28Mn-10Al-1C-3Cu austenitic lightweight steel were taken by Gleeble-3500 thermal simulation testing machine.The strain rate was 0.01-10 s^(-1),the deformation temperature was 850-1100℃,and the strain was 0.6.The rheological behavior of Fe-28Mn-10Al-1C-3Cu austenitic lightweight steel was obtained.The results show that the stress decreases with the increase of deformation temperature at the same strain rate.The stress increases with the increase of strain rate at the same deformation temperature.Combined the obtained true stress-strain curve with the Arrhenius and Zener-Holomon equation,the thermal deformation constitutive equation of Fe-28Mn-10Al-1C-3Cu austenitic lightweight steel was constructed.Based on the dynamic material model and Prasad instability criterion,the energy dissipation map and rheological instability map of lightweight steel were calculated,and the hot processing map was plotted.The suitable hot deformation process region for the steel was determined.Region I is strain rate 0.01-0.08 s^(-1)and deformation temperature 975-1025℃,and region II is strain rate 0.01-0.76 s^(-1)and deformation temperature is 1050-1100℃.The re

关 键 词：Fe-28Mn-10Al-1C-3Cu轻质钢 热压缩 热变形 本构方程 热加工图 

分 类 号：U465.11[一般工业技术—材料科学与工程] TG142.1[机械工程—车辆工程]