Effect of a Surface Element Exposure Algorithm for Selective Laser Melting on the Mechanical Properties of the Synthesized Material: II. Fatigue

被引：0
|
作者：
Evgenov, A. G. [1 ]
Ryzhkov, P. V. [1 ]
Shurtakov, S. V. [1 ]
Malinin, R. Yu. [1 ]
机构：
[1] VIAM, Natl Res Ctr Kurchatov Inst, Moscow 105005, Russia
来源：
RUSSIAN METALLURGY | 2024年 / 2024卷 / 02期
关键词：
selective laser melting; low-cycle fatigue; fatigue life; fatigue limit; fracture; CYCLE FATIGUE; DEFECTS;
D O I：
10.1134/S0036029524700630
中图分类号：
TF [冶金工业];
学科分类号：
0806 ;
摘要：
Using a high-strength VZh159 nickel superalloy as an example, we study the low-cycle fatigue characteristics of cylindrical solid and hollow specimens synthesized by selective laser melting (SLM). Specimens with a gage portion surface roughness of R-a = 4.80 mu m after SLM, R-a = 1.06 mu m after vibratory finishing, and R-a = 0.20 mu m after polishing are analyzed. A negative effect of the surface roughness on fatigue life has been established: the fatigue life of vibration-finished and unprocessed specimens turns out to be lower than that of polished specimens by 17%. The Manson-Coffin and Ramberg-Osgood curves indicate increased plasticity of specimens with an unprocessed surface and surface hardening after vibratory finishing. The results of fractographic studies demonstrate that the decrease in the fatigue strength is associated with the presence of defects caused by the peculiarities of exposure of surface elements, and this decrease in hollow specimens is greater.
引用
收藏
页码：339 / 347
页数：9
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