| 符师桦,高越,潘华烨,程腾,崔传勇,张青川*.数字散斑相关法研究镍钴基高温合金中的PLC效应[J].实验力学,2012,27(5):581~586 |
| 数字散斑相关法研究镍钴基高温合金中的PLC效应 |
| Investigation on Portevin-Le Chatelier Effect in a Ni-Co Based Superalloy Base on Digital Speckle Correlation |
| 投稿时间：2012-04-13 修订日期：2012-07-15 |
| DOI： |
| 中文关键词: Portevin-Le Chatelier效应 动态应变时效 高温合金 数字散斑相关 PLC带 |
| 英文关键词:Portevin-Le Chatelier (PLC) effect dynamic strain aging superalloy digital speckle correlation PLC band |
| 基金项目:国家自然科学基金(11102201和51171179)、中国科学院“百人计划”项目资助、中国博士后科学基金(20100480684)以及中央高校基本科研业务费专项资金(WK2090050017)资助的课题。 |
| 作者 | 单位 | | 符师桦 | 中国科学技术大学, 中国科学院材料力学行为和设计重点实验室, 合肥 230027 | | 高越 | 中国科学技术大学, 中国科学院材料力学行为和设计重点实验室, 合肥 230027 | | 潘华烨 | 中国科学技术大学, 中国科学院材料力学行为和设计重点实验室, 合肥 230027 | | 程腾 | 中国科学技术大学, 中国科学院材料力学行为和设计重点实验室, 合肥 230027 | | 崔传勇 | 中国科学院金属研究所, 沈阳 110016 | | 张青川* | 中国科学技术大学, 中国科学院材料力学行为和设计重点实验室, 合肥 230027 |
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| 中文摘要: |
| 作为航空发动机涡轮盘用新型材料,镍钴基变形高温合金在300~600℃温度区间内拉伸时会产生Portevin-Le Chatelier (PLC)效应。本文采用数字散斑相关方法,研究了镍钴基变形高温合金在400℃下拉伸变形过程中伴随PLC效应出现的应变局域化现象,即PLC带。实验结果表明,PLC带内的应变比试件平均应变大一个数量级,而带外部分应变接近于零。同时还观察到了带外部分的弹性收缩现象,即出现应变为负的区域。在拉伸全程中,PLC带与拉伸轴方向成约60°的夹角。PLC带的宽度均为4~4.5 mm,远大于试件最小尺寸(厚度),这一点与铝合金中的带宽与试件最小尺寸相近这一现象截然不同。 |
| 英文摘要: |
| As a new material used in aero-engine turbine disk, Ni-Co based superalloy subjected to tension action presents Portevin-Le Chatelier (PLC) effect within temperature range from 300 to 600℃. In this study, when a Ni-Co based superalloy was subjected to tension action at temperature 400℃,the strain localization phenomena associated with PLC effect, namely PLC band,was investigated by using digital speckle correlation method. Experimental results show that the strain within PLC band is larger than average strain an order of magnitude, but the strain outside PLC band is close to zero. At the same time, the elastic shrinkage is observed outside PLC band, i.e. the area with nagetive strain existes. PLC bandwidth is about 4~4.5mm, much larger than the minimum size (thickness) of tested specimen, and the angle between PLC band and tension axis is about 60°. Both PLC bandwidth and angle are constant in whole deformation process. Finally, by comparing with PLC effect in Al based alloys, a notable divergence is found, i.e. in Al based alloys, PLC bandwidth is close to the minimum size of specimen. |
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