异步轧制工艺参数对MB1镁合金板材组织和性能的影响
Influences of Differential Speed Rolling Process Parameters on Microstructure and Properties of MB1 Magnesium Alloy Sheets
摘 要
采用不同异速比(1.2~1.8)和轧制路径对MB1镁合金板材进行异步轧制,对轧制得到合金板材的显微组织和力学性能进行了研究.结果表明:开始随着异速比(<1.6)的增大,MB1镁合金板材的显微组织逐渐细化,孪晶数量不断减少,抗拉强度和伸长率增大;当异速比为1.6时,合金的晶粒最均匀细小,平均尺寸约为20 μm,且几乎没有孪晶,抗拉强度为235 MPa,伸长率达到23%;再进一步增大异速比,合金的力学性能又有所下降;按不同路径进行轧制,合金的晶粒逐步细化、均匀,孪晶依次减少,板材的伸长率按路径A,B,C,D的顺序逐步升高,强度逐步降低.
异速比
轧制路径
显微组织
力学性能
MB1 magnesium alloy
different speed ratio
rolling route
microstructure
mechanical property
Abstract
The microstructure and mechanical properties of MB1 magnesium alloy sheet produced by differential speed rolling process under the conditions of different rolling speed ratios (1.2-1.8) and rolling routes were studied.The results show that when the rolling speed ratio increased from 1.2 to 1.6,the grains became refined and twins disappeared gradually,and the tensile strength and elongation all increased.Especially when the rolling speed ratio was 1.6,the alloy had minimum grain size of 20 μm with no twin,its tensile strength and elongation could reach 235 MPa and 23%.However,when the rolling speed ratio increased further,the mechanical properties droped a little.When the routes were changed from A,B,C to D,the grains became refined and twins disappeared gradually,while the strength decreased and elongation increased gradually.
中图分类号 TG146.2
所属栏目 试验研究
基金项目 上海市重点学科建设资助项目(B503)
收稿日期 2008/10/7
修改稿日期 2009/4/15
网络出版日期
作者单位点击查看
备注李伟(1984-),男,安徽天长人,硕士研究生.
引用该论文: LI Wei,ZHANG Xiu-qin,FENG Wen-tao,QI Jian-jun,ZHAO Zu-xin,MA Chun-jiang. Influences of Differential Speed Rolling Process Parameters on Microstructure and Properties of MB1 Magnesium Alloy Sheets[J]. Materials for mechancial engineering, 2009, 33(10): 5～8
李伟,张修庆,冯文涛,齐建军,赵祖欣,马春江. 异步轧制工艺参数对MB1镁合金板材组织和性能的影响[J]. 机械工程材料, 2009, 33(10): 5～8
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【6】WATANABE H,MUKAI T,ISHIKAWA K.Differential speed rolling of an AZ31 magnesium alloy and the resulting mechanical properties[J].Journal of Materials Science,2004,39:1477-1480.
【7】张文玉,刘先兰,陈振华,等.异步轧制AZ31镁合金板材室温冲压性能研究[J].塑性工程学报,2007,14(4):6-10.
【8】刘兴,陈振华,夏伟军,等.异步轧制对AZ31镁合金板材组织和性能的影响[J].热加工工艺,2006,35(20):22-25.
【9】张青来,卢晨,朱燕萍,等.轧制方式对AZ31镁合金薄板组织和性能的影响[J].中国有色金属学报,2004,14(3):391-397.
【10】GAO H,RAMALINGAM S C,BARBER G C,et al.Analysis of asymmetrical cold rolling with varying coefficients of friction[J].Journal of Materials Processing Technology,2002,124(1/2):178-182.
【11】IWANAGA K,TASHIRO H,OKAMOTO H,et al.Improvement of formability from room temperature to warm temperature in AZ31 magnesium alloy[J].Journal of Materials Processing Technology,2004,155/156:1313-1316.
【12】VALLE J A,PRADO M T,RUANO O A.Texture evolution during large-strain hot rolling of the AZ61 Mg alloy[J].Materials Science and Engineering A,2003,355:68-78.
【13】KIM W J,LEE J B,KIM W Y,et al.Microstructure and mechanical properties of Mg-Al-Zn alloy sheets severely deformed by asymmetrical rolling[J].Scripta Materialia,2007,56:309-312.
【14】崔忠圻,刘北兴.金属学与热处理原理[M].哈尔滨:哈尔滨工业大学出版社,1998:156.
【15】FURUKAWA M,HORITA Z,NEMOTO M,et al.Microhardness measurements and the Hall-Petch relationship in an A1-Mg alloy with sub micrometer grain size[J].Acta Materialia,1996,44(11):4619-4629.
【16】FURUKAWA M,IWAHASHI Y,HORITA Z.The shearing characteristics associated with equal-channel angular pressing[J].Material Science and Engineering A,1998,257(2):328-332.
【17】吕宜振.Mg-Al-Zn合金组织、性能、变形和断裂行为研究[D].上海:上海交通大学,2001:8-24.
【18】BOHLEN J,CHMELIK F,DOBRON P,et al.Acoustic emission during tensile testing of magnesium AZ alloys[J].Journal of Alloys and Compounds,2004,37(8):214-219.
【19】BARNETT M R.Recrystallization during and following hot working of magnesium alloy[J].Material Science Forum,2003,5(3):419-422.
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