。538· 北京科技大学学报 2006年第6期 on microstructure and mecharical properties of copper-bearing [7 Sun W P.Liu W J.Jonas JJ.A creep technique for monitor high-stmength alloy steds.Mater Sci Eng 1998.A252:256 ing Mr precipitation in Si steels.Metall Trans,1989.20A [4]Krishnadev M R.Galibois A.Some aspects of precipitation of (12):2707 copper and columbium (Nb)catbide in an experimental high [8 Maruyama K.Kushima H.Watanabe T.Preediction of long strength steel.Metall Trans A.1975.6(1):222 tem creep curve and rupture life of 2 25Cr-1Mo steel.ISIJ [5]Sano N.Machara Y.Initial stage of Cu precipitation in Cu 1nt1990.30(10):817 added ultra low carbon steel.J Jpn Inst Met,1996.60(3): [牙王学敏，周桂峰，杨普武，等.不同C含量超低碳钢的时效 261 行为.金属学报，2000,36(2)：113 [6]Morita M.Sato K.Hosoya Y.Factors affeting texture for 10]W ada H.Houbaert Y.Penning J.Strengthering effects of mation of Cu-precipitation hardening coldmlled stee sheet. Cu in steel ATB Metall,1983.23 (3):3.1 ISIJ Int1994.341):92 Aging precipitation in low carbon bainitic steels LI Chuang,WANGXuemin,ZHOU Guifeng2),Y ANG Shanwu,SHANG Chengjian, HE Xinlai) 1)Materiak Science and Ergineering School.University of Science and Technology Beijing.Beijing 100083,China 2)National Enterprise s Technical Center.Wuhan Iron Steel Corporation,Wuhan 40080.China ABSTRACT The aging hardening behavior of low carbon bainitic steels with Cu,Nb,Cr,and Mo was determined,and creep tests for various steels were conducted on a Gleeble-1500 thermal simulator.Optical microscope and TEM were employ ed to study the microstructure and precipitates of the steels respectively. The results indicate that there is an obvious aging hardening behavior during the aging of copper containing steels;a plateau occurs on the creep curve at different temperatures,which results from the precipitation. The occurrence of the plateau means the start of the precipitation process,and when the precipitation fin- ishes the plateau disappears. KEY WORDS low carbon bainitic steel;creep:microstructure;aging precipitate (上接第523页) Composite shear wall system and mechanical properties of GRC stay-in-place mould QU Junyi2,LI Yanping,QIAO Lan) 1)Civil and Environmental Engineering School,University of Science and Technology Beijing,Beijng 100083.China 2)Hebei Constnuction Department,Shijazhuang 050051,China ABSTRACT To study the feasibility of a glass-fiber reinforced cement(GRC)composite shear w all sy stem with stay-in-place mould,this paper tested the bonding behavior betw een GRC plate and concrete,and the experimental data were analyzed to show a better bonding property.The test on the mechanical properties of the GRC plate was also carried out and show ed that it has a good bending strength.It is concluded that the composite shear wall system with GRC stay-in-place mould is feasible and available. KEY WORDS glass-fiber reinfo rced cement;stay-inplace mould;composite reinforcement concrete shear w all;bonding behavior;mechanical propertieson microstructure and mechani cal properties of copper-bearing high-strength alloy steels.Mater Sci Eng, 1998, A252:256 [ 4] Krishnadev M R, Galibois A.Some aspects of precipitation of copper and columbium ( Nb ) carbide in an experimen tal high strength st eel.Metall Trans A, 1975, 6( 1) :222 [ 5] Sano N, Maehara Y .Initial st age of Cu precipitation in Cu added ultra low carbon steel.J Jpn Inst Met, 1996, 60( 3 ) : 261 [ 6] Morita M, Sato K, Hosoya Y.Fact ors aff ecting texture f or￾mation of Cu-precipitation hardening cold-rolled st eel sheet . ISIJ Int, 1994, 34( 1) :92 [ 7] Sun W P, Liu W J, Jonas J J.A creep t echnique for monit or￾ing M nS precipit ation in Si steels.Metall Trans, 1989, 20A ( 12) :2707 [ 8] Maruyama K, Kushima H, Wat anabe T .Preediction of long term creep curve and rupture life of 2.25C r-1Mo st eel.ISIJ Int, 1990, 30( 10) :817 [ 9] 王学敏, 周桂峰, 杨善武, 等.不同 Cu 含量超低碳钢的时效 行为.金属学报, 2000, 36( 2) :113 [ 10] Wada H, Houbaert Y, Penning J .Strengthening effects of Cu in st eel.ATB Metall, 1983, 23 ( 3) :3.1 Aging precipitation in low carbon bainitic steels LI Chuang 1) , WANG X uemin 1) , ZHOU Guifeng 2) , Y ANG Shanwu 1) , SHANG Chengjian 1) , HE Xinlai 1) 1) Materials Science and Engineering School, University of Science and Technology Beijing, Beijing 100083, China 2) National Ent erprise' s Technical Center, Wuhan Iron &S teel Corporation, Wuhan 430080, China ABSTRACT The aging hardening behavior of low carbon bainitic steels with Cu, Nb, Cr, and M o was determined, and creep tests for various steels were conducted on a Gleeble-1500 thermal simulator .Optical microscope and TEM were employ ed to study the microstructure and precipitates of the steels respectively . The results indicate that there is an obvious aging hardening behavior during the aging of copper containing steels;a plateau occurs on the creep curve at different temperatures, w hich results from the precipitation . The occurrence of the plateau means the start of the precipitation process, and w hen the precipitation fin￾ishes the plateau disappears . KEY WORDS low carbon bainitic steel ;creep ;microstructure;aging precipitate ( 上接第 523 页) Composite shear wall system and mechanical properties of GRC stay-in-place mould QU J unyi 1, 2) , LIU Y anping 1) , QIAO Lan 1) 1) Civil and Environment al Engineering S chool, University of S cience and Technology Beijing, Beijing 100083, China 2) Hebei Construction Department, S hijiazhuang 050051, China ABSTRACT To study the feasibility of a glass-fiber reinfo rced cement ( GRC) composite shear w all sy stem w ith stay-in-place mould, this paper tested the bonding behavior betw een GRC plate and concrete, and the experimental data were analyzed to show a better bonding property .The test o n the mechanical properties of the GRC plate was also carried out and show ed that it has a good bending strength .It is concluded that the composite shear w all system with GRC stay-in-place mould is feasible and available. KEY WORDS g lass-fiber reinfo rced cement ;stay-in-place mould ;composite reinforcement concrete shear w all ;bonding behavio r;mechanical properties · 538 · 北 京 科 技 大 学 学 报 2006 年第 6 期