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【期刊论文】Diffusivity of Al Fe near the diffusion bonding interface of Fe3Al with low carbon steel
李亚江, LI YAJIANG *, †, WANG JUAN †, YIN YANSHENG † and MA HAIJUN †
Bull. Mater. Sci., Vol. 28, No.1, February 2005, pp. 000-000.,-0001,():
-1年11月30日
The distribution of elements near the Fe3Al/Q235 diffusion bonding interface was computed by the diffusion equation as well as measured by means of EPMA. The results indicated close agreement between the two for iron and aluminium. Diffusion coefficient in the interface transition zone is larger than that in the Fe3Al and Q235 steel at the same temperature, which is favourable to elemental diffusion. The diffusion distance near the Fe3Al/Q235 interface increased with increasing heating temperature, T, and the holding time, t. The relation between the width of the interface transition zone, x, and the holding time, t, conformed to parabolic growth law: x2=4
Fe3Al, intermetallic, diffusion bonding, interface, diffusion.,
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【期刊论文】XRD and SEM analysis near the diffusion bonding interface of Mg/Al dissimilar materials
李亚江, Yajiang Li a, Peng Liu b, Juan Wang b, Haijun Ma b
Vacuum 82(2008)15-19,-0001,():
-1年11月30日
The microstructure and phase constitution near the diffusion bonding interface of Mg/Al dissimilar materials are studied using a scanning electron microscope (SEM), X-ray diffraction (XRD) and transmission electron microscope (TEM). The test results indicated that an obvious diffusion zone was formed near the Mg/Al interface during the vacuum diffusion bonding. The diffusion transition zone near the interface consists of various MgxAly phases. The transition region on the Mg side mainly consists of Mg crystals, and the new phase formed was the Mg3Al2 phase having a face-centred cubic lattice. This is favorable for improving the combined strength of Mg substrate and diffusion transition zone.
Mg-Al dissimilar materials, Diffusion bonding, Microstructure, Phase structure
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【期刊论文】Effect of Cr and Ni on diffusion bonding of Fe3Al with steel
李亚江, WANG JUAN † LI YAJIANG *, † and MA HAIJUN
Bull. Mater. Sci., Vol. 28, No.1, February 2005, pp. 000-000.,-0001,():
-1年11月30日
Microstructure at the diffusion bonding interface between Fe3Al and steel including Q235 low carbon steel and Cr18-Ni8 stainless steel was analysed and compared by means of scanning electron microscopy and transmission electron microscopy. The effect of Cr and Ni on microstructure at the Fe3Al/steel diffusion bonding interface was discussed. The experimental results indicate that it is favourable for the diffusion of Cr and Ni at the interface to accelerate combination of Fe3Al and steel during bonding. Therefore, the width of Fe3Al/Cr18-Ni8 interface transition zone is more than that of Fe3Al/Q235. And Fe3Al dislocation couples with different distances, even dislocation net occur at the Fe3Al/Cr18-Ni8 interface because of the dispersive distribution of Cr and Ni in Fe3Al phase.
Cr, Ni, Fe3Al/, steel interface, diffusion bonding.,
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【期刊论文】Finite element analysis of residual stress in the welded zone of a high strength steel
李亚江, LI YAJIANG*, WANG JUAN, CHEN MAOAI and SHEN XIAOQIN
Bull. Mater Sci., Vol. 27 No.2, April 2004, 101-106,-0001,():
-1年11月30日
The distribution of the residual stress in the weld joint of HQ130 grade high strength steel was investigated by means of finite element method (FEM) using ANSYS software. Welding was carried out using gas shielded arc welding with a heat input of 16 kJ/cm. The FEM analysis on the weld joint reveals that there is a stress gradient around the fusion zone of weld joint. The instantaneous residual stress on the weld surface goes up to 800~1000MPa and it is 500~600 MPa, below the weld. The stress gradient near the fusion zone is higher than any other location in the surrounding area. This is attributed as one of the significant reasons for the development of cold cracks at the fusion zone in the high strength steel. In order to avoid such welding cracks, the thermal stress in the weld joint has to be minimized by controlling the weld heat input.
High strength steel, gas shielded arc welding, residual stress, weld cracks.,
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【期刊论文】XRD and TEM Analysis in the Interface of Diffusion Bonding for Fe3A1/Q235 dissimilar materials
李亚江, Yajiang LI+, Juan WANG and Huiqiang WU, Jicai FENG
J. Mater. Sci. Technol., Vol. 19 No.1, 2003,-0001,():
-1年11月30日
onic microscope (TEM) and electron diffraction, etc. The test results indicated that obviously a diffusion transition zone forms near the interface of FeaAI/Q235 under the condition of heating temperature 1050~1100℃, holding time 60 rain and pressure 9.8MPa, which indicated that the diffusion interface of Fe3AI/Q235 was combined well. The diffusion transition zone consisted of Fe3AI and α-Fe(AI) solid solution. Microhardness near the diffusion transition zone was HM 480-540. There was not brittle phase of high hardness in the interface transition zone. This is favorable to enhance toughness of Fe3AI/Q235 diffusion joint.
Fe2A1 intermetallic compound,, Diffusion bonding,, Interface,, Phase structure
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