The influence of laser-induced tempering on the microstructure and mechanical properties of 1500 MPa martensitic steel friction stir welded joints

IF 4.6 2区 物理与天体物理 Q1 OPTICS Optics and Laser Technology Pub Date : 2024-11-22 DOI:10.1016/j.optlastec.2024.112094
Shuhao Zhu , Xiangxiang Zhu , Wenyuan Lv , Ling Cen , Ming Gao , Yufeng Sun , Lihong Wu , Hidetoshi Fujii , Shaokang Guan
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Abstract

A comprehensive comparison illustrates the role of laser technology in altering the macro morphology and microstructure of martensitic steel joints produced by friction stir welding (FSW). In this study, laser-induced tempering (LIT) was introduced to the FSW of 1500 MPa martensitic steel. The mechanism by which LIT enhanced the mechanical properties of the FSW joints was elucidated by comparing joints produced with and without LIT. Experimental findings revealed that LIT effectively eradicated tunnel defects under the same FSW parameters. Even with an increase in travelling speed from 60 mm/min to 120 mm/min, flawless welds were achieved under LIT conditions. At 500 rpm and 60 mm/min, the bottom of the stir zone (SZ) in conventional FSW (C-FSW) joint exhibited a ferrite and martensite dual-phase microstructure. In contrast, the SZ of the LIT-FSW joint had a fully martensitic structure. Moreover, LIT resulted in significant variations in the martensitic hierarchical structure within the SZ. LIT reduced ferrite distribution in the dual-phase zone, caused recrystallized ferrite to appear further from the SZ. The stress concentration in the dual-phase zone attributed to joint fracture. The improvement in the mechanical properties of martensitic steel FSW joints was explained by analyzing the correlation between the stress concentration factor and phase fraction. Additionally, the increase in traveling speed narrowed the dual-phase zone, triggered a constraint effect that led to a maximum ultimate tensile strength (UTS) increase from 986 MPa at 60 mm/min joint to 1142 MPa at 120 mm/min joint.

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激光诱导回火对 1500 兆帕马氏体钢搅拌摩擦焊接接头微观结构和力学性能的影响
一项综合比较说明了激光技术在改变搅拌摩擦焊(FSW)生产的马氏体钢接头的宏观形态和微观结构方面的作用。本研究在 1500 兆帕马氏体钢的 FSW 中引入了激光诱导回火(LIT)。通过比较使用和未使用 LIT 的接头,阐明了 LIT 提高 FSW 接头机械性能的机理。实验结果表明,在相同的 FSW 参数下,LIT 能有效消除隧道缺陷。即使将移动速度从 60 mm/min 提高到 120 mm/min,在 LIT 条件下也能实现无缺陷焊接。在 500 rpm 和 60 mm/min 的转速下,传统 FSW(C-FSW)接头的搅拌区(SZ)底部呈现铁素体和马氏体双相微观结构。相比之下,LIT-FSW 接头的搅拌区则完全是马氏体结构。此外,LIT 还导致 SZ 内的马氏体分层结构发生显著变化。LIT 减少了双相区的铁素体分布,使再结晶铁素体出现在离 SZ 更远的地方。双相区的应力集中导致了接头断裂。通过分析应力集中因子与相分数之间的相关性,可以解释马氏体钢 FSW 接头机械性能的改善。此外,移动速度的增加缩小了双相区,引发了约束效应,导致最大极限拉伸强度 (UTS) 从 60 mm/min 接头的 986 兆帕增加到 120 mm/min 接头的 1142 兆帕。
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来源期刊
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
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