{"title":"Hydrogen embrittlement behavior of Al-Si coated steel laser wire filling welding joint","authors":"","doi":"10.1016/j.optlastec.2024.111785","DOIUrl":null,"url":null,"abstract":"<div><p>This study investigated the hydrogen embrittlement behaviors of three laser welding joints for the 1500 MPa Al-Si coated steel using slow strain rate tensile and hydrogen concentration experiments. The results show that LW-HT is fractured in the fusion zone without hydrogen charging because the δ-ferrite reduces the mechanical properties. With the increase in hydrogen concentration, the fracture location is still FZ. The fusion zone of LWF-HT is composed of martensite and retained austenite, and when the hydrogen concentration is 3.4 ppm, retained austenite traps many hydrogen atoms. The newly formed martensite during tensile inheriting the high hydrogen concentration in retained austenite causes cleavage in the fusion zone. When the hydrogen concentration is 13.6 ppm, most hydrogen segregates at the prior austenite grain boundaries, causing an intergranular fracture in the fusion zone. The fusion zone of LWF-HS is composed of martensite and carbide, and grain refinement and nanoscaled Fe<sub>3</sub>C can reduce HE susceptibility. With the increase in hydrogen concentration, the fracture location is still base materials. The significantly increased hydrogen concentration compared to LWF-HT is mainly trapped in carbides without reducing the banding force of dislocations and grain boundaries. This work provides a scientific basis and technical direction for realizing high-quality laser wire-filling welding of Al-Si coated steel.</p></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":null,"pages":null},"PeriodicalIF":4.6000,"publicationDate":"2024-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Optics and Laser Technology","FirstCategoryId":"101","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S003039922401243X","RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"OPTICS","Score":null,"Total":0}
引用次数: 0
Abstract
This study investigated the hydrogen embrittlement behaviors of three laser welding joints for the 1500 MPa Al-Si coated steel using slow strain rate tensile and hydrogen concentration experiments. The results show that LW-HT is fractured in the fusion zone without hydrogen charging because the δ-ferrite reduces the mechanical properties. With the increase in hydrogen concentration, the fracture location is still FZ. The fusion zone of LWF-HT is composed of martensite and retained austenite, and when the hydrogen concentration is 3.4 ppm, retained austenite traps many hydrogen atoms. The newly formed martensite during tensile inheriting the high hydrogen concentration in retained austenite causes cleavage in the fusion zone. When the hydrogen concentration is 13.6 ppm, most hydrogen segregates at the prior austenite grain boundaries, causing an intergranular fracture in the fusion zone. The fusion zone of LWF-HS is composed of martensite and carbide, and grain refinement and nanoscaled Fe3C can reduce HE susceptibility. With the increase in hydrogen concentration, the fracture location is still base materials. The significantly increased hydrogen concentration compared to LWF-HT is mainly trapped in carbides without reducing the banding force of dislocations and grain boundaries. This work provides a scientific basis and technical direction for realizing high-quality laser wire-filling welding of Al-Si coated steel.
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