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Effect of homogenization treatment on microstructure evolution and the distributions of RE and Zr elements in various MgeLieREeZr alloys 被引量:10
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作者 Lei Bao Qichi Le +2 位作者 Zhiqiang Zhang Jianzhong Cui Qinxue Li 《Journal of Magnesium and Alloys》 SCIE EI CAS 2013年第2期139-144,共6页
Mge3Lie0.4Zr alloys containing RE elements(Gd,La,Nd)(Mge3LieREe0.4Zr alloys)are investigated to reveal the influence of homogenization treatment on microstructures and distributions of RE,Zr elements.It is found that... Mge3Lie0.4Zr alloys containing RE elements(Gd,La,Nd)(Mge3LieREe0.4Zr alloys)are investigated to reveal the influence of homogenization treatment on microstructures and distributions of RE,Zr elements.It is found that 300C24 h homogenization treatment shows better improvement on the microstructure including the refinement of grain size,the dispersion of cellular dendrite and low melting point particles.Before treatment,La and Nd segregate effectively at grain boundary and Zr segregates in the form of precipitates.Homogenization treatment induces the reduction of RE segregation.However,the segregation of Zr in precipitates cannot be abated due to the relatively low diffusion rate compared with RE elements. 展开更多
关键词 MgeLi based alloys RE elements Homogenization treatment microstructure micro segregation
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Microstructure and Fractural Morphology of Cobalt-based Alloy Laser Cladding 被引量:1
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作者 陈浩 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2003年第3期30-32,共3页
The solidification features,micro segregation,and fracture characteristics of cobalt based alloy on the substrate of 20CrMo steel by laser cladding were studied by using electron microscopy.Experimental results show... The solidification features,micro segregation,and fracture characteristics of cobalt based alloy on the substrate of 20CrMo steel by laser cladding were studied by using electron microscopy.Experimental results show that the fine columnar grains and cellular dendrite grains are obtained which are perpendicular to the coating/substrate interface;the primary arms are straight while the side branches are degenerated;the microstructure consists of primary face centered cubic (fcc) Co dendrites and a network of Cr enriched eutectic M23C6 (M=Cr,W,Fe) carbides;the micro segregation is severe for the rapid heating and cooling of laser cladding;the typical brittle intergranular fracture occurs in cobalt based laser cladding layer. 展开更多
关键词 laser cladding Cobalt based alloy solidification microstructure micro segregation FRACTURE
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Study on Oxygen Potential of Ferromanganese Melt during Desiliconization
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作者 CHEN Er-bao DONG Yuan-chi GUO Shang-xing 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2001年第2期12-15,共4页
The first micro segregation under conditions of twin roll strip casting was simulated. The relationship between the temperature and solid fraction in the mushy zone was given. The temperatures such as ZDT, LIT were g... The first micro segregation under conditions of twin roll strip casting was simulated. The relationship between the temperature and solid fraction in the mushy zone was given. The temperatures such as ZDT, LIT were got from this simulation. Then using the turbulent model, the flow field and thermal field in the pool of twin roll strip caster was simulated. The speed and temperature at different casting speed was given, and the results were also explained. By these two simulations, the appropriate casting speed can be found. These simulations can provide effective data for controlling the twin roll strip casting process. 展开更多
关键词 strip casting micro segregation solid fraction TURBULENCE
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