High Temperature Hot Deformation Behavior andHot Processing Map of 20Cr2Ni4A Steel
-
摘要: 利用热模拟试验机,在变形温度800~1 050 ℃、应变速率0.01~5 s-1条件下对20Cr2Ni4A钢进行单道次热压缩试验,对获得的真应力-真应变曲线进行摩擦修正,根据摩擦修正后的曲线,分析了其高温热变形行为,构建了热变形本构模型,绘制了热加工图。结果表明:通过摩擦修正计算得到的流变应力小于实测应力,二者差距随应变增加而增大;当变形温度为850~1 050 ℃,应变速率为0.01~0.1 s-1时,试验钢在热压缩过程中的动态再结晶较明显;构建的热变形本构模型能够很好地预测试验钢在高温变形时的峰值应力,预测值与实测值的平均相对误差在3.44%;由建立的热加工图结合显微组织,得出试验钢适宜的热变形工艺参数为变形温度875~925 ℃、应变速率0.01~0.02 s-1和变形温度925~1 050 ℃、应变速率0.01~1 s-1。
-
关键词:
- 20Cr2Ni4A钢 /
- 热变形 /
- 本构方程 /
- 热加工图
Abstract: Single-pass hot compression tests were carried out on 20Cr2Ni4A steel at deformation temperatures of 800-1 050 ℃ and strain rates of 0.01-5 s-1 with thermal simulation test machine. The obtained true stress-true strain curves were modified by friction. According to the curves after frictional modification, the hot deformation behavior of 20Cr2Ni4A steel at high temperature was analyzed, the hot deformation constitutive model was constructed, and the hot processing map was drawn. The results show that the flow stresses calculated by friction modification were smaller than the measured stresses, and the difference between the two increased with the increase of strain. When the deformation temperatures were 850-1 050 ℃ and the strain rates were 0.01-0.1 s-1, the dynamic recrystallization of the test steel during hot compression deformation was obvious. The hot deformation constitutive model could predict the peak stress of the test steel, and the average relative error between the predicted value and the measured value was 3.44%. According to the established hot processing map combined with the microstructure analysis, the optimum hot deformation parameters of the test steel were listed as follows: deformation temperatures of 875-925 ℃, strain rates of 0.01-0.02 s-1 or deformation temperatures of 925-1 050 ℃ and strain rates of 0.01-1 s-1.-
Keywords:
- 20Cr2Ni4A steel /
- hot deformation /
- constitutive equation /
- hot processing map
-
-
[1] 刘国强,王小海,张鹏,等.20Cr2Ni4A齿轮钢天然气渗碳工艺研究[J].铸造,2021,70(5):540-546. LIU G Q,WANG X H,ZHANG P,et al.Study on natural gas carburizing process for 20Cr2Ni4A gear steel[J].Foundry,2021,70(5):540-546.
[2] 罗子相,刘克,杨兵,等.20Cr2Ni4A钢制框架轴开裂原因分析[J].金属热处理,2021,46(11):245-249. LUO Z X,LIU K,YANG B,et al.Crack cause analysis of 20Cr2Ni4A steel gimbal axis[J].Heat Treatment of Metals,2021,46(11):245-249.
[3] 陈建文,袁伍丰,蒋亦舟,等.锻造加热温度对20Cr2Ni4A钢奥氏体晶粒长大及力学性能的影响[J].金属热处理,2022,47(2):112-118. CHEN J W,YUAN W F,JIANG Y Z,et al.Effect of forging heating temperature on austenite grain growth and mechanical properties of 20Cr2Ni4A steel[J].Heat Treatment of Metals,2022,47(2):112-118.
[4] 吕少敏.GH4151合金高温变形行为及组织与性能控制研究[D].北京:北京科技大学,2021:153. LYU S M.Research on high deformation behavior and microstructure-properties control of GH4151 alloy[D].Beijing:University of Science and Technology Beijing,2021:153. [5] 段园培,黄仲佳,余小鲁,等.基于摩擦修正的TB6合金流变应力行为研究及本构模型建立[J].稀有金属,2014,38(2):202-209. DUAN Y P,HUANG Z J,YU X L,et al.Flow stress behavior and constitutive model of as-cast TB6 titanium alloy based on friction correction[J].Chinese Journal of Rare Metals,2014,38(2):202-209.
[6] GHOLAMZADEH A,KARIMI TAHERI A.The prediction of hot flow behavior of Al-6%Mg alloy[J].Mechanics Research Communications,2009,36(2):252-259.
[7] ZHAO H T,QI J J,LIU G Q,et al.A comparative study on hot deformation behaviours of low-carbon and medium-carbon vanadium microalloyed steels[J].Journal of Materials Research and Technology,2020,9(5):11319-11331.
[8] ZHANG L,YUAN S,WANG J H,et al.Hot deformation behavior,processing map,microstructure evolution and dynamic recrystallization mechanism of Mg-5Al-0.6Sc alloy[J].Journal of Alloys and Compounds,2022,922:166244.
[9] ZHENG Z Z,CHEN Y Y,KONG F T,et al.Hot deformation behavior and hot rolling properties of a nano-Y2O3 addition near-α titanium alloy[J].Metals,2021,11(5):837.
[10] 王伟聪.新型奥氏体耐热不锈钢C-HRA-5的热变形行为及热加工图[D].太原:太原理工大学,2021:68. WANG W C.The hot deformation behavior and hot processing map of a new type of austenitic heat-resistant stainless steel C-HRA-5[D].Taiyuan:Taiyuan University of Technology,2021:68. [11] WANG H R,WANG W,ZHAI R X,et al.Constitutive equations for describing the warm and hot deformation behavior of 20Cr2Ni4A alloy steel[J].Metals,2020,10(9):1169.
[12] TANG S L,ZHOU M,LI X,et al.Microstructure and hot deformation behavior of the Cu-1Ni-0.9Sn-0.5Ti-0.3Cr alloy[J].Materials Today Communications,2022,31:103771.
[13] KHOMUTOV M G,POZDNIAKOV A V,CHURYUMOV A Y,et al.Flow stress modelling and 3D processing maps of Al4.5Zn4.5Mg1Cu0.12Zr alloy with different scandium contents[J].Applied Sciences,2021,11(10):4587.
[14] 杨雨童,罗锐,程晓农,等.喷射成形高强Al-Zn-Mg-Cu合金的高应变速率塑性变形行为[J].中国有色金属学报,2019,29(12):2700-2708. YANG Y T,LUO R,CHENG X N,et al.Plastic deformation behavior of spray formed high-strength Al-Zn-Mg-Cu alloy at high strain rate[J].The Chinese Journal of Nonferrous Metals,2019,29(12):2700-2708.
[15] PRASAD Y V R K. Processing maps:A status report[J].Journal of Materials Engineering and Performance,2003,12(6):638-645.
[16] WU Y T,LIU Y C,LI C,et al.Deformation behavior and processing maps of Ni3Al-based superalloy during isothermal hot compression[J].Journal of Alloys and Compounds,2017,712:687-695.
[17] 王桂花,杨秋月,吴珊珊,等.GH2132高温合金热变形行为研究[J].塑性工程学报,2021,28(3):137-145. WANG G H,YANG Q Y,WU S S,et al.Study on hot deformation behavior of GH2132 superalloy[J].Journal of Plasticity Engineering,2021,28(3):137-145.
计量
- 文章访问数: 6
- HTML全文浏览量: 0
- PDF下载量: 3
下载:
