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

IF 0.3 Q4 METALLURGY & METALLURGICAL ENGINEERING

Russian Metallurgy (Metally) Pub Date : 2025-01-08 DOI:10.1134/S0036029524700630

A. G. Evgenov, P. V. Ryzhkov, S. V. Shurtakov, R. Yu. Malinin

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Abstract

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 μm after SLM, R_a = 1.06 μm after vibratory finishing, and R_a = 0.20 μm 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.

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选择性激光熔化表面元曝光算法对合成材料力学性能的影响[j]。乏力

以高强度VZh159镍高温合金为例，研究了选择性激光熔化（SLM）法制备的圆柱形固体和空心试样的低周疲劳特性。对表面粗糙度分别为Ra = 4.80 μm、Ra = 1.06 μm和Ra = 0.20 μm的样品进行了分析。表面粗糙度对疲劳寿命有负面影响：振动精加工和未加工试样的疲劳寿命比抛光试样低17%。Manson-Coffin曲线和Ramberg-Osgood曲线表明，未加工表面和振动抛光后表面硬化的试样塑性增加。断口学研究结果表明，疲劳强度的下降与表面元素暴露特性引起的缺陷的存在有关，并且在空心试样中这种下降更大。

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来源期刊

Russian Metallurgy (Metally) METALLURGY & METALLURGICAL ENGINEERING-

CiteScore

0.70

自引率

25.00%

发文量

140

期刊介绍： Russian Metallurgy (Metally) publishes results of original experimental and theoretical research in the form of reviews and regular articles devoted to topical problems of metallurgy, physical metallurgy, and treatment of ferrous, nonferrous, rare, and other metals and alloys, intermetallic compounds, and metallic composite materials. The journal focuses on physicochemical properties of metallurgical materials (ores, slags, matters, and melts of metals and alloys); physicochemical processes (thermodynamics and kinetics of pyrometallurgical, hydrometallurgical, electrochemical, and other processes); theoretical metallurgy; metal forming; thermoplastic and thermochemical treatment; computation and experimental determination of phase diagrams and thermokinetic diagrams; mechanisms and kinetics of phase transitions in metallic materials; relations between the chemical composition, phase and structural states of materials and their physicochemical and service properties; interaction between metallic materials and external media; and effects of radiation on these materials.