| 镁合金铸轧过程中表面点状偏析形成机制 |
| |
| 引用本文： | 翁文凭,邓 康,任忠鸣,迟之东,陈 琦.镁合金铸轧过程中表面点状偏析形成机制[J].稀有金属材料与工程,2013,42(8):2093-2096. |
| |
| 作者姓名： | 翁文凭 邓 康 任忠鸣 迟之东 陈 琦 |
| |
| 作者单位： | 北京航空材料研究院先进高温结构材料重点实验室,北京,100095 |
| |
| 基金项目： | 江苏省自然科学基金面上项目（BK2010249）；苏州市科技支撑计划（SG201227）；中色科技股份公司科技发展基金项目（2008YK02） |
| |
| 摘 要： | 研究了DD6单晶高温合金二次γ'相的析出规律和二次γ'相对持久性能的影响.结果表明；DD6合金固溶保温后炉冷,基体通道内有细小的二次γ'相析出；固溶后1120℃/4 h一次时效空冷,基体通道内有大量的二次γ'相析出；固溶后1120℃/4h一次时效炉冷,基体通道内没有二次γ '相析出;固溶并一次时效后在870℃二次时效过程中,随保温时间增加二次γ'相逐渐溶解,32 h时效后二次γ'相完全消失,在随后空冷过程中没有二次γ '相析出.基体通道内的二次γ'相阻碍基体中位错的运动,促使位错剪切一次γ'相,因此基体通道内的二次γ'相降低DD6合金760℃/785MPa持久寿命；DD6合金标准热处理后,基体通道内的二次γ'相消失,760℃/785MPa持久寿命显著提高.
|
| 关 键 词： | DD6 单晶高温合金 热处理 二次γ'相 持久性能 |
| 收稿时间： | 2012/10/12 0:00:00 |
Formation of Surface Bleeding Segregations during Twin-Roll Casting of Magnesium Alloys |
| |
| Weng Wenping,Deng Kang,Ren Zhongming,Chi Zhidong and Chen Qi.Formation of Surface Bleeding Segregations during Twin-Roll Casting of Magnesium Alloys[J].Rare Metal Materials and Engineering,2013,42(8):2093-2096. |
| |
| Authors: | Weng Wenping Deng Kang Ren Zhongming Chi Zhidong and Chen Qi |
| |
| Affiliation: | Science and Technology on Advanced High Temperature Structural Materials Laboratory, Beijing Institute of Aeronautical Materials, Beijing 100095, China |
| |
| Abstract: | Microstructure and micro-area chemical composition of surface bleeding segregations of magnesium alloy strips processed via twin-roll casting were investigated by OM, SEM and WDS. The results indicate that surface bleeds are composed of solute-rich intermetalics of Al and Zn element, the percentage composition of Mn element in surface bleeds is similar to that of the matrix alloy. The structure of surface bleeds changes into equiaxed grain with fine grain size. Stop-samples were achieved by abruptly interrupting casting for analyzing the solidification and deformation characters in the set-back of magnesium alloys strips, and the formation mechanism of surface bleeds were discussed. Furthermore, the characteristics of solute elements distribution in surface bleedings including Al, Zn and Mn elements were discussed |
| |
| Keywords: | DD6 single crystal superalloy heat treatment fine secondary γ' phase stress rupture property |
| 本文献已被 万方数据 等数据库收录！ |
| 点击此处可从《稀有金属材料与工程》浏览原始摘要信息 |
|
点击此处可从《稀有金属材料与工程》下载全文 |
|
