Residual tensile stress mitigation and surface hardness enhancement in Ti6Al4V alloy via elevated temperature laser surface melting

IF 4.6 2区物理与天体物理 Q1 OPTICS

Optics and Laser Technology Pub Date : 2025-05-16 DOI:10.1016/j.optlastec.2025.113177

Rama Balhara, Justin Hijam, Adarsh V Jose, Madhu Vadali

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引用次数: 0

Abstract

Laser surface melting (LSM) is a versatile technique used to modify surface properties without affecting the bulk characteristics of materials. This paper investigates the effects of LSM with pre-heating at different temperatures on the induced residual tensile stresses, hardness, and surface topography of Ti6Al4V alloy. A finite element-based numerical model is developed to analyse the cooling rate during the process. Cooling rates decrease, and melt pool dimensions increase in LSM at elevated temperatures. This decreases the residual tensile stresses and increases the microhardness. Experimental results reveal that higher pre-heating temperatures lead to up to 42 % reduction in residual tensile stress and up to 25 % improvement in microhardness, with minimal effect on surface topography. This study highlights the efficacy of elevated temperature LSM to mitigate residual tensile stresses and enhance surface hardness, which is promising for defence, aerospace, and automotive applications.

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高温激光表面熔化处理Ti6Al4V合金的残余拉伸应力和表面硬度

激光表面熔化（LSM）是一种用途广泛的技术，用于在不影响材料体积特性的情况下改变材料的表面特性。研究了在不同温度下预热LSM对Ti6Al4V合金残余拉伸应力、硬度和表面形貌的影响。建立了基于有限元的数值模型来分析冷却过程中的冷却速率。在高温下，LSM的冷却速率降低，熔池尺寸增大。这降低了残余拉伸应力，提高了显微硬度。实验结果表明，较高的预热温度可使残余拉伸应力降低42%，显微硬度提高25%，而对表面形貌的影响最小。这项研究强调了高温LSM在减轻残余拉伸应力和提高表面硬度方面的功效，这在国防、航空航天和汽车应用中是有希望的。

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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来源期刊

Optics and Laser Technology 物理-光学

CiteScore

8.50

自引率

10.00%

发文量

1060

审稿时长

3.4 months

期刊介绍： Optics & Laser Technology aims to provide a vehicle for the publication of a broad range of high quality research and review papers in those fields of scientific and engineering research appertaining to the development and application of the technology of optics and lasers. Papers describing original work in these areas are submitted to rigorous refereeing prior to acceptance for publication. The scope of Optics & Laser Technology encompasses, but is not restricted to, the following areas: •development in all types of lasers •developments in optoelectronic devices and photonics •developments in new photonics and optical concepts •developments in conventional optics, optical instruments and components •techniques of optical metrology, including interferometry and optical fibre sensors •LIDAR and other non-contact optical measurement techniques, including optical methods in heat and fluid flow •applications of lasers to materials processing, optical NDT display (including holography) and optical communication •research and development in the field of laser safety including studies of hazards resulting from the applications of lasers (laser safety, hazards of laser fume) •developments in optical computing and optical information processing •developments in new optical materials •developments in new optical characterization methods and techniques •developments in quantum optics •developments in light assisted micro and nanofabrication methods and techniques •developments in nanophotonics and biophotonics •developments in imaging processing and systems