Microstructure homogenization of laser powder bed fusion support-free low angle IN718 walls through heat treatment

IF 4.7 Q2 ENGINEERING, MANUFACTURING

Additive manufacturing letters Pub Date : 2025-07-01 DOI:10.1016/j.addlet.2025.100312

Minsol Park, Mudit Kesharwani, Mohammad Attarian Shandiz, Mathieu Brochu

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Abstract

This study investigates the effectiveness of heat treatment (HT) to homogenize the microstructural and mechanical asymmetry between the bulk and the downskin regions of support-free IN718 walls fabricated at angles of 30°, 20°, 15°, and 10° In the as-built condition, the microhardness ranged from 340 ± 5 HV to 351 ± 4 HV for the bulk and from 315 ± 4 HV to 323 ± 10 HV for the downskin region, resulting in a maximum difference range of 35 HV. The HT eliminated this difference where microhardness values of 482 ± 3 HV in the bulk and 478 ± 4 HV in the downskin were measured. The HT induced γ″ precipitation with volume fraction and mean precipitate size in the bulk of 16.6 % and 24.7 ± 7.3 nm. These values are statistically comparable to those in the downskin: 15.8 % and 26.5 ± 7.9 nm. The similarity in the γ″ characteristics explains the recovery of the mismatch in hardness as γ″ contributes approximately 85 % of the strengthening in the HT condition.

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热处理后激光粉末床熔合无支架低角IN718壁的显微组织均匀化

本研究调查的有效性热处理(HT)之间的微观结构和机械不对称散装同质化,支持自由downskin地区的IN718墙壁捏造在30°角,20°,15°,和10°竣工条件,显微硬度范围从340±5高压351±4高压散装和从315±4高压323±10 downskin地区的高压,导致最大35高压范围的差异。HT消除了这种差异，测量了主体的显微硬度值为482±3hv，下皮肤的显微硬度值为478±4hv。高温诱导γ″析出，体积分数为16.6%，平均析出尺寸为24.7±7.3 nm。这些值在统计上与下皮肤的值相当：15.8%和26.5±7.9 nm。γ″特征的相似性解释了硬度不匹配的恢复，因为γ″在高温条件下贡献了大约85%的强化。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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