Surface Roughness, Areal Topographic Measurement, and Correlation to LCF Behavior in a Nickel-Based Superalloy
Surface Roughness, Areal Topographic Measurement, and Correlation to LCF Behavior in a Nickel-Based Superalloy
复制标题
DOI：
10.1007/s11665-014-1130-5
复制
发表时间：
2014-10-01
影响因子：
2.3
通讯作者：
Bache, M. R.
中科院分区：
文献类型：
--
作者：
Ardi, D. T.;Li, Y. G.;Bache, M. R.
表面粗糙度通常决定了先进工程部件的疲劳性能，因此在制造之后必须定义此参数。传统上，形貌测量采用从二维接触测量获得的平均幅度参数R（a）。然而，这个参数是高度局部化的，使得它相对不可靠。本研究试图将区域（3D）地形测量与镍基高温合金（Waspaloy）定义的低周疲劳（LCF）性能相关联。三种不同的表面光洁度，即纵向抛光，周向地面，和纵向地面疲劳试样。地形特征相对于加载轴的高度和方向被发现会影响LCF性能。结果表明，失效循环次数与最大高度（S（z））和十点高度（S（5z））参数之间存在密切相关性。基于实验数据生成了考虑地形效应的幂拟合。
Surface roughness often determines fatigue performance of advanced engineering components making definition of this parameter essential subsequent to manufacture. Traditionally, topography measurements employ an average amplitude parameter, R (a), obtained from a two-dimensional contact measurement. This parameter, however, is highly localised making it relatively unreliable. This study attempts to correlate areal (3D) topographic, measurements with the low cycle fatigue (LCF) performance defined for a nickel-based superalloy (Waspaloy). Three different surface finishes, namely longitudinal polished, circumferential ground, and longitudinal ground were applied to fatigue specimens. The height and orientation of the topographic features with respect to the loading axis were found to affect LCF performance. Results indicate a close correlation between cycles to failure and the maximum height (S (z)) and ten-point height (S (5z)) parameters. A power fit to account for the topographic effect was generated based on the experimental data.