LIU Rixin NING Baolin ** Dept.of Metallurgy
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Kunming Institute of Technology
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Kunming
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650093
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China*** Dept.of Thermal Energy
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Northeast University of Technology
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Shenyang
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110006
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China+ To whom correspondence should be addressed
材料科学技术（英）
This paper provides a mathematical model for the billet reheating process in furnace.A new optimum method is brought up that the objective function is the integral value of enthalpy increasing process of a billet.Different delays are simulated and calculated,some proper delay strategies are ob- tained.The on-line computer control model is de- veloped.The real production conditions simulated, the temperature deviation of drop out billet from the target temperature is kept within±15℃.
关键词:
reheating furnace
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XUE Xiangxin DU Hegui Northeast University of Technology
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Shenyang
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China XUE Xiangxin Lecturer
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Dept.of Ferrous Metallurgy
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Northeast University of Technology
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Shenyang
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110006
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China
金属学报(英文版)
An experimental study has been made of oxidation kinetics of Ti in molten Cu-Ti alloy under watery atmosphere at 1500℃.The results may be expressed as follows: [Ti]_(Cu)=0.92-0.69t O≤t≤1.0(h) [Ti]_(Cu)=0.02t~2-0.14t+0.35 1.0≤t≤6.0(h) where t is time in hour.The apparent rate and order of reaction are: (-d[Ti]_(Cu))/dt=0.69,pseudo-zeroth order,k=0.69 (-d[Ti]_(Cu))/dt=0.14-0.04t,pseudo-0.85 order,k=0.39 The apparent mass tranfer coefficient is k'=0.16 cm/h,and the relation of W~2 vs time is: W~2=1.04·10~(-4)t
关键词:
Cu-Ti alloy
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HUANG Yan
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MA Longxiang Northeast Universtity of Technology
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Shenyang
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China lecturer
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Department of Metalforming
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Northeast University of Technology
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Shenyang 110006
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China
金属学报(英文版)
Diffusion bonding of supcrplastic Al alloy LC4,with prior surface treatment of organic solution protecting coating after electroplishing and stainless steel wool brushing,was performed by Gleeble test machine under conditions ranged 490—530 ℃,1.0—3.0 MPa. 30—180 min and vacuum of 1.0×10~(-3) Pa.The joints were examined to have similar strength and microstructure to the base metal Discussion was made on the effect of superplastic treatment on bonding.The micromechanism for diffusion bonding of super- plastic metal was suggested as the migration of original bond interfaces caused by atomic diffusion and grain growth. Experimental results for the alloy as quench-aged state were presented to compare with the superplastic one.
关键词:
superplasticity
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GONG Bo LAI Zuhan Northeast University of Technology
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Shenyang
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ChinaNIINOMI Mitsuo
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KOBA YASHI Toshiro Toyohashi University of Technology
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Toyohashi Japan Department of Physics
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Northeast University of Technology
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Shenyang 110006
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China
金属学报(英文版)
A new process to refine the microstructure of α+βtvpe Ti alloys was developed by using hydrogen as a temporary alloying element.It involves hydrogenating the alloys below the hydrogenated β transus temperature about 0-40 K,air cooling to room temperature and then dehydrogenating at 948 K.Ti-6AI-4V and Ti-5AI-2.5Fe alloys treated hy this new process show much refined microstructures,and the yield strength,ultimate strength as well as the elongation increase 8—15,5—13 and 7—14% respectively
关键词:
Ti-6Al-4V
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ZHANG Yifeng Northeast University of Technology
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Shenyang
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ChinaZHENG Chaogui YE Yupu Peking University
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Beijing
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China Department of Chemistry
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Northeast University of Technology
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Shenyang.China
金属学报(英文版)
The phase diagram of system NdCl_3-LiCl-KCl has been investigated by DTA.Six surfaces corresponding to the prhnary crystallization of NdCl_3,LiCl,KCl,γ-KCl·NdCl_3, β-3KCl·NdCl_3 and 2KCl·NdCl_3 respectively,eleven univariant lines related to the sec- ondary crystallization,two ternary eutectics E_1(70.5wt-% NdCl_3+8.0wt-% KCl,360℃) and E,(5.0wt-% NdCl_3+ 53.0wt-% KCl,355℃)and one ternary peritectic P (67.0wt-% NdCl_3+10.0wt-% KCl,375℃)were found.It is also chtrified that this study on the system NdCl_3- KCl differs from previous work in the two transition temperatures: e_1(77.0 wt-% NdCl_3,484℃),e_2(40.0wt-% NdCl_3,620℃),p (70.0wt-%NdCl_3,610℃),3KCl·NdCl_3(690℃)and two reactions: α-3KGl·NdCl_3β-3KGl·NdCl_3 (355℃) β-SKGl·NdCl_3γ-3KCl·NdCl_3 (450℃) The eutectic point e_5(31.0wt-%LiCl,460C)is determined for the pseudobinary system 3KCl·NdCl_3—LiCl.
关键词:
ternary system NdCl_3—LiCl—KCl
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JI Jingwen WEI Quanjin GENG Dianqi WU Yuqin Northeast University of Technology
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Shenyang
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China Professor
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Dept.of Physics
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Northeast University of Technology
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Shenyang 110006
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China
金属学报(英文版)
The grain boundary internal friction(GBIF)in Fe-P and Fe-P-La alloys containing trace Cu has been studied.It is found that an addition of 0.584—0.722 wt-% La obviously reduces the IF,shifts grain boundary peaks towards higher temperatures,and produces a small addi- tional peak at even higher temperature.The mechanism of GBIF is explained as the movement of defects of atomic size,namely point defects,at gram boundaries and/or their clusters un- der stress.
关键词:
internal friction
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CUI Jianzhong MA Longxiang Northeast University of Technology
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Shenyang
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China Department of Metals Forming
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Northeast University of Technology
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Shenyang
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China
金属学报(英文版)
The method controlling grain shape in TMT processing and the effect of grain shape on char- acteristic parameters in superplastic deformation were discussed.The accommodation velocity of grahl boundary sliding,which is the dominant mechanism in superplastic deformation,and the contribution of each mechanism to the total strain,as influenced by grain shape,were ana- lyzed.Grain shape has been shown to be an essential structural factor for superplasticity.Then an analysis was made about the effect of grain shape on the region transition strain rate so that a new concept,critical aspect for superplasticity,was worked out.These predictions were compared with the measured results in an Al-Zn-Mg alloy.
关键词:
superplastic deformation
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