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基于非标试样对增材制造IN 625拉伸强度的评估。

Assessment of Additive Manufactured IN 625's Tensile Strength Based on Nonstandard Specimens.

作者信息

Paraschiv Alexandru, Matache Gheorghe, Condruz Mihaela Raluca, Dobromirescu Cristian

机构信息

Special Components for Gas Turbines Department, Romanian Research and Development Institute for Gas Turbines COMOTI, 220D Iuliu Maniu, 061126 Bucharest, Romania.

Section IX-Materials Science and Engineering, Technical Sciences Academy of Romania, 26, Dacia Blvd., 030167 Bucharest, Romania.

出版信息

Materials (Basel). 2023 Jul 10;16(14):4930. doi: 10.3390/ma16144930.

DOI:10.3390/ma16144930
PMID:37512205
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC10381172/
Abstract

The study aimed to evaluate the tensile strength of additively manufactured (AMed) IN 625 using sub-sized test pieces and compare them to standard specimens. Cylindrical round coupons of varying diameters were manufactured along the -axis using the laser powder bed fusion technique and subjected to heat treatment. The simulation of the alloy solidification predicted the formation of several intermetallics and carbides under equilibrium conditions (slow cooling), apart from the γ phase (FCC). Sub-sized tensile specimens with different gauge diameters were machined from the coupons and tensile tested at ambient temperature. The results showed that sub-sized specimens exhibited lower tensile and yield strengths compared to standard specimens, but still higher than the minimum requirements of the relevant ASTM standard for AMed IN 625. The lower strength was attributed to the "size effect" of the test specimens. Fracture surfaces of the sub-sized test specimens exhibit a mixed character, combining cleavage and microvoid coalescence, with improved ductility compared to standard test pieces. The study highlights the importance of adapting characterization methods to the particularities of manufactured parts, including reduced thicknesses that make sampling standard-size specimens impractical. It concludes that sub-sized specimens are valuable for quality control and verifying compliance with requirements of AMed IN 625 tensile properties.

摘要

该研究旨在使用亚尺寸试件评估增材制造（AMed）的IN 625的拉伸强度，并将其与标准试件进行比较。使用激光粉末床熔融技术沿z轴制造了不同直径的圆柱形圆形试样，并进行了热处理。合金凝固模拟预测，在平衡条件下（缓慢冷却），除了γ相（面心立方）外，还会形成几种金属间化合物和碳化物。从试样上加工出具有不同标距直径的亚尺寸拉伸试样，并在室温下进行拉伸试验。结果表明，与标准试样相比，亚尺寸试样的抗拉强度和屈服强度较低，但仍高于增材制造的IN 625相关ASTM标准的最低要求。强度较低归因于试样的“尺寸效应”。亚尺寸试样的断口呈现出解理和微孔聚结相结合的混合特征，与标准试样相比，其延展性有所提高。该研究强调了使表征方法适应制造零件的特殊性的重要性，包括厚度减小使得采集标准尺寸试样不切实际的情况。研究得出结论，亚尺寸试样对于质量控制和验证是否符合增材制造的IN 625拉伸性能要求具有重要价值。

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