热处理对直接金属激光烧结718合金摩擦学行为的影响

Effect of heat treatment on tribological behavior of direct metal laser sintered alloy 718.

作者信息

Muthu S M, Veeman Dhinakaran, Asokan Vijayakumar, Sathishkumar M, Vadivel Kannan L, Vignesh M, Rajeshkumar L

机构信息

Centre for Additive Manufacturing, Chennai Institute of Technology, Chennai 600069, India.

Department of Nuclear and Quantum Engineering, Korea Advanced Institute of Science and Technology, Daejeon 34141, Republic of Korea.

出版信息

iScience. 2024 Nov 18;27(12):111415. doi: 10.1016/j.isci.2024.111415. eCollection 2024 Dec 20.

DOI:10.1016/j.isci.2024.111415

PMID:39687009

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11647136/

Abstract

The main aim of this work is to enhance the wear performance of the direct metal laser sintered (DMLS) alloy 718 by solution treatment aging (STA) method at room temperature (RT) (28°C) and 400°C in dry sliding conditions. The effect of microstructure, phase analysis, and microhardness on the wear behavior and the influence of STA on the specimen at elevated temperatures were studied. The microstructure revealed the presence of melt pool boundary (MPB) in untreated DMLS alloy while recrystallized grains were observed in the STA-treated alloy. The wear results elucidated that STA-treated alloy exhibited better wear resistance than as-built alloy due to high hardness at both conditions. Severe wear loss occurred at high temperatures caused by the delamination of the brittle oxide glazing layer, while oxidation and adhesive wear were the predominant wear mechanisms. Results also portrayed that the test temperature and STA treatment equally influenced the wear behavior of alloy 718.

摘要

这项工作的主要目的是通过在室温（RT，28°C）和400°C下进行固溶处理时效（STA）方法，在干滑动条件下提高直接金属激光烧结（DMLS）718合金的耐磨性能。研究了微观结构、相分析和显微硬度对磨损行为的影响以及STA在高温下对试样的影响。微观结构显示，未经处理的DMLS合金中存在熔池边界（MPB），而在经STA处理的合金中观察到再结晶晶粒。磨损结果表明，由于在两种条件下都具有高硬度，经STA处理的合金比增材制造合金表现出更好的耐磨性。高温下由于脆性氧化釉层的分层导致严重的磨损损失，而氧化和粘着磨损是主要的磨损机制。结果还表明，试验温度和STA处理同样影响718合金的磨损行为。