共搜索到38535条信息，每页显示10条信息，共3854页。用时：0小时0分0秒712毫秒
-Mg晶粒得到有效细化. 关键词:AZ91D镁合金；复合变质剂；Al4C3；晶粒细化 中图分类号:TG146.2 文献标志码:A Effect of complex carbon inoculants on grain refinement... of complex inoculants on the as-cast and solid-solution state microstructure of AZ91D magnesium alloy and the grain refinement mechanism were investigated by OM, SEM, EDS and XRD. The results show......
......
Grain refinement in a cast high Nb containing TiAl alloy by heat treatmentLIU Zicheng, LIN Junpin, WANG Yanli, LIN Zhi, SONG Xiping, and CHEN Guoliang State Key Laboratory for Advance Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China摘 要:<正> The grain refinement of an as-cast Ti-46Al-8.5Nb-0.2W (atom fraction......
. The results show that, near the recrystallization temperature, the grain size of the alloy decreases rapidly with increasing deformation loop. However, when deformed at higher temperature, the refinement degree of the grain increases firstly, and then decreases with the increase of deformation loops, and the refinement effect of 6 loops is better. Moreover, with the increase of deformation temperature......
that the grain refinement is an important method to improve properties and formability of magnesium alloys. Recent investigation indicated that Sr additions, which have been widely used in industrial practice..., the grain refinement in industrial applications usually involves adding nuclei and/or solute elements into a melt before casting, and the effect of a solute element may be explained in terms......
Surface grain refinement mechanism of SMA490BW steel cross joints by ultrasonic impact treatmentBo-lin He,Lei Xiong,Ming-ming Jiang,Ying-xia Yu,Li LiSchool of Mechanical & Electronic Engineering,East... makes use of ultrasonic vibration to impact and plastically deform a weld toe and can achieve surface grain refinement of the weld toe,which is considered as the main reason for the improvement......
is very important to ensure that large reduction can be easily carried out in the following rolling. Unfortunately, the research of microstructure evolution, grain refinement and surface defect... increasing the addition of Ca would make the grain size enhanced to a certain extent. This result shows that the addition of Ca into the AZ31 alloy has a limited efficiency of the grain refinement......
sharply, but also transfers the grain shape of α-Mg from coarse dendritic to nearly spheralitic with the shape factor from about 0.1 to approximate 0.8. And the "refinement & electromagnetic.... The shape factor of the dendrites is about 0.1[13].3.1 Carbon inoculation The relations between the grain size and the holding time in the refinement with carbon inoculation processing (Figs.3 and 4......
Grain refinement in the coarse-grained region of the heat-affected zone in low-carbon high-strength microalloyed steelsRan Wei1), Cheng-jia Shang2), and Kai-ming Wu1) 1) International Research..., China摘 要:The microstructural features and grain refinement in the coarse-grained region of the heat-affected zone in low-carbon high-strength microalloyed......
?m.本试验条件下晶粒发生异常长大的温度阀值约为400 ℃. 关键词:镁合金；Mg-4Al-2Si合金；往复挤压；动态再结晶；晶粒细化 中图分类号:TG146.2；TG142.1 文献标志码:A Grain refinement of Mg-4Al-2Si magnesium alloy byreciprocating extrusion process SONG Pei-wei (School of Materials Science and Engineering, Shaanxi University of Technology, Hanzhong 723003, China) Abstract: The microstructures and grain refinement mechanisms......
