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of porous copper with long cylindrical pores fabricated by a unidirectional solidification method.Three samples with porosity of 29.87%,34.47%and 50.98%were chosen and cut into size of 60 mm(length)26... that the porous copper with elongated cylindrical pores has larger heat dissipation performance than both the bulk copper and the bored copper,which is attributed to its higher specific surface area.Application......
Solidification crack susceptibility of aluminum alloy weld metals LIU Ren-pei(刘仁培)1, DONG Zu-jue(董祖珏)2, PAN Yong-ming(潘永明)2 1. College of Materials Science and Technology, Nanjing University... alloy is type B cracking model in which the strain rate has little effect on the deformation ability of the liquid film. Key word: aluminum alloy; weld metal; susceptibility; weldability......
%. The electric conductivity increases from 88.9%IACS to 91.2%IACS. The tensile strength is increased by 47% from 300 MPa to 440 MPa. Key words: Al2O3/Cu composite; hot pressing; rolling; pores 1 Introduction...-industry, integrated circuit lead frame for IC industry and contact material instead of Ag matrix contact[7-15]. Pores existing in the material reduce the effective cross-sectional area and negatively......
are no gas pores in 6013 Al alloy of CO2 laser welding when NaF, Na3AlF6, Na3AlF6+LiF and LiF+ NaF were used as the activating flux, respectively. But a lot of gas pores appear in weld when Ni2O3, TiO2... Table 1 Comparison of microstructure in weld and HAZ of laser welding between with activating flux and without activating flux Fig. 6 Gas pores in 6013 Al alloy weld for activating flux CO2 laser......
Formulation of grain growth diagram in simulated weld HAZ of Ti-microalloyed steel Kun CUI1,Qi CHEN1,Chibin GUI1 (1.Department of Naval Architecture and Ocean Engineering, School of Naval Architecture and Power Engineering, Navy University of Engineering, Wuhan 430033, China) Abstract:s agreed well with the value of the diagram predicted. Key words:Ti-microaUoyed steel; Grain growth in weld......
Residual stress relaxation in typical weld joints and its effect on fatigue and crack growth Chunyan JI1,Zhengquan WAN2,Liangbi LI1,Zili WANG1 (1.School of Naval Architecture and Ocean Engineering... for predicting the residual stress at hot spot quantitatively is proposed. Based on the formula, an improved fatigue procedure is introduced. Moreover, crack growth of typical weld joints considering......
Mechanism of effect of rare earth oxides on high temperature corrosion resistance of weld metal LI Zhi-yong(李志勇)1, WANG Bao(王 宝)1 , ZHANG Han-qian(张汉谦)2 1. College of Materials Science... Abstract: Through the addition of rare earth oxides into the coating of electrodes, the high temperature oxidation and sulphidation resistance of weld metal were studied. The transfer mechanism......
MODELING OF AUSTENITE GRAIN SIZE IN LOW-ALLOY STEEL WELD METAL Y.S.Wang1,A.G.Huang1,Z.Y.LI1,Q.Hu1,J.G.Xiong1 (1.School of Materials Science & Engineering,Huazhong University of Science and Technology,Wuhan 430074,China) Abstract:The size of austenite grain hassignificant effects on components and proportions of various ferrites in low-alloy steel weld metal.Therefore,it is important......
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