秦芳诚,李永堂

• 1:太原科技大学材料科学与工程学院

摘要(Abstract)：

对25Mn钢铸坯辗扩后环件进行不同温度的再加热,借助光学显微镜观察组织以及利用扫描电镜和电子背散射衍射技术分析晶粒取向差角分布、织构演化过程和拉伸与冲击试样断口形貌。结果表明,加热温度升高,晶粒尺寸增大趋势明显,660℃时大约2/3的晶粒平均直径为16~28μm,但基本呈正态分布特征;高温条件下,亚晶界通过回复作用不断吸收位错,晶界取向差角向大角度晶界迁移的比例增加。反极图结果表明织构形态主要为{001}<110>,600℃时织构强度高,伴有{112}<110>组分织构;随着再加热温度升高织构强度明显减弱。所测定试样力学性能均较高,拉伸断口韧窝明显,且在660℃时韧窝直径大、塑性最好,断面收缩率达到了58.3%,呈韧窝断裂形式。冲击试样断口具有少量解理平台和撕裂棱。

关键词(KeyWords)： 25Mn钢铸坯;加热温度;晶界取向差;织构;力学性能

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金重点项目(51135007);国家自然科学基金(51174140,51205270);; 高等学校博士点优先发展计划(20111415130001);; 山西省回国留学人员科研项目(2011-084);; 山西省自然科学基金(2014011026-2)

作者(Author): 秦芳诚,李永堂

DOI: 10.13289/j.issn.1009-6264.2016.03.017

参考文献(References)：

• [1]Zherebtsov S N,Fatyanov S V.Centrifugal electroslag casting of annular flange blanks[J].Chemical and Petroleum Engineering,2005,41(5):348-350.
• [2]闫红红,李永堂,胡勇,等.Q235B环形铸坯显微组织和力学性能的研究[J].机械工程学报,2014,50(14):89-94.YAN Hong-hong,LI Yong-tang,HU Yong,et al.Study on the microstructure and mechanical properties of Q235B ring casting blank[J].Journal of Mechanical Engineering,2014,50(14):89-94.
• [3]Li Y T,Ju L,Qi H P,et al.Technology and experiments of 42Cr Mo bearing ring forming based on casting ring blank[J].Chinese Journal of Mechanical Engineering,2014,27(2):417-427.
• [4]王明礼.42Cr Mo轴承套圈毛坯的铸辗复合工艺[J].轴承,2013(12):19-20.WANG Ming-li.Casting-rolling forming process of 42Cr Mo bearing ring blank[J].Bearing,2013(12):19-20.
• [5]Qi H P,Li Y T.Metadynamic recrystallization of the as-cast 42Cr Mo steel after normalizing and tempering during hot compression[J].Chinese Journal of Mechanical Engineering,2012,25(5):853-859.
• [6]李永堂,齐会萍,李秋书,等.基于铸辗复合成形的42Cr Mo钢环坯铸造工艺与试验研究[J].机械工程学报,2013,49(20):49-54.LI Yong-tang,QI Hui-ping,LI Qiu-shu,et al.Casting process and experimental research of 42Cr Mo ring blanks based on cast-rolling forming technology[J].Journal of Mechanical Engineering,2013,49(20):49-54.
• [7]郭良刚,潘霞,杨合,等.驱动辊转速对铸态42Cr Mo钢环件热辗轧微观组织的影响规律[J].重型机械,2012(3):59-64.GUO Liang-gang,PAN Xia,YANG He,et al.Effects of rotational speed of driving roll on microstructure evolution during hot ring rolling of as-cast42Cr Mo steel[J].Heavy Machinery,2012(3):59-64.
• [8]李永堂,齐会萍,付建华,等.42Cr Mo钢铸造环坯辗扩成形理论与工艺分析[J].机械工程学报,2013,49(6):198-206.LI Yong-tang,QI Hui-ping,FU Jian-hua,et al.Theoretical and process analyses on the cast-blank rolling forming of 42Cr Mo bearing rings[J].Journal of Mechanical Engineering,2013,49(6):198-206.
• [9]秦芳诚,李永堂,齐会萍,等.基于铸辗复合成形的25Mn钢法兰热处理工艺的试验研究[J].机械工程学报,2014,50(14):95-104.QIN Fang-cheng,LI Yong-tang,QI Hui-ping,et al.Research experimental of heat treatment process of 25Mn steel flange based on cast-rolling compound forming technology[J].Journal of Mechanical Engineering,2015,36(7):96-103.
• [10]Herrera C,Lima N B,Filho A F,et al.Texture and mechanical properties evolution of a deep drawing medium carbon steel during cold rolling and subsequent recrystallization[J].Journal of Materials Processing Technology,2009,209:3518-3524.
• [11]Chen Y L,Su L,Zhao A M,et al.Effects of rolling parameters on texture and formability of high strength ultra-low carbon BH steel[J].Journal of Iron and Steel Research,International,2013,20(6):75-81.
• [12]Song H Y,Liu H T,Lu H H,et al.Effect of hot rolling reduction on microstructure,texture and ductility of strip-cast grain-oriented silicon steel with different solidification structures[J].Materials Science&Engineering A,2014,605:260-269.
• [13]Joo M S,Suh D W,Bae J H,et al.Experiments to separate the effect of texture on anisotropy of pipeline steel[J].Materials Science&Engineering A,2012,556:601-606.
• [14]秦芳诚,李永堂.基于热辗扩工艺的低碳钢环坯晶粒长大规律[J].材料热处理学报,2015,36(7):96-103.QIN Fang-cheng,LI Yong-tang.Research on the grain growth rules of low carbon steel ring blanks based on hot rolling process[J].Transactions of Materials and Heat Treatment,2015,36(7):96-103.
• [15]Park J H,Hamad K,Widiantara I P,et al.Strain and crystallographic texture evaluation of interstitial free steel cold deformed by differential speed rolling[J].Materials Letters,2015,147:38-41.
• [16]Li C S,Yang H,Wang Y F,et al.Texture of hot rolled strip for Fe-3Si steel produced by thin slab casting and rolling[J].Journal of Iron and Steel Research,International,2010,17(12):46-53.
• [17]杨平,常守海,孙祖庆.低碳钢热变形过程中铁素体的织构形成规律[J].材料研究学报,2003,17(5):520-529.YANG Ping,CHANG Shou-hai,SUN Zu-qing.Orientational analysis of warm-compressed ferrite in a low carbon steel by means of orientation mapping[J].Chinese Journal of Materials Research,2003,17(5):520-529.
• [18]王亚男,孟祥志,王珣.不同加热温度对Q225钢微观组织的影响[J].材料热处理学报,2013,34(10):127-131.WANG Ya-nan,MENG Xiang-zhi,WANG Xun.Influence of different heating temperatures on microstructure of Q225 steel[J].Transactions of Materials and Heat Treatment,2013,34(10):127-131.

文章评论(Comment)：