Residential College | false |
Status | 已發表Published |
Mechanical Properties and Hydrogen Embrittlement of Laser-Surface Melted AISI 430 Ferritic Stainless Steel | |
Chan, W.K.1; Kwok, C. T.1,2; Lo, K. H.1,2 | |
2020-02-04 | |
Source Publication | Coatings |
ISSN | 2079-6412 |
Volume | 10Issue:2Pages:140 |
Abstract | In the present study, the feasibility of laser surface melting (LSM) of AISI 430 ferritic stainless steel to minimize hydrogen embrittlement (HE) was investigated. LSM of AISI 430 steel was successfully achieved by a 2.3-kW high power diode laser (HPDL) with scanning speeds of 60 mm/s and 80 mm/s (the samples are designated as V60 and V80, respectively) at a power of 2 kW. To investigate the HE effect on the AISI 430 steel without and with LSM, hydrogen was introduced into specimens by cathodic charging in 0.1 M NaOH solution under galvanostatic conditions at a current density of 30 mA/cm2 and 25 ◦C. Detail microstructural analysis was performed and the correlation of microstructure with HE was evaluated. By electron backscatter diffraction (EBSD) analysis, the austenite contents for the laser-surface melted specimens V60 and V80 are found to be 0.6 and 1.9 wt%, respectively. The amount of retained austenite in LSM specimens was reduced with lower laser scanning speed. The surface microhardness of the laser-surface melted AISI 430 steel (~280 HV0.2) is found to be increased by 56% as compared with that of the substrate (~180 HV0.2) because of the presence of martensite. The degree of embrittlement caused by hydrogen for the charged and non-charged AISI 430 steel was obtained using slow-strain-rate tensile (SSRT) test in air at a strain rate of 3 × 10−5 s−1. After hydrogen pre-charging, the ductility of as-received AISI 430 steel was reduced from 0.44 to 0.25 while the laser-surface melted AISI 430 steel showed similar tensile properties as the as-received one. After LSM, the value of HE susceptibility Iδ decreases from 43.2% to 38.9% and 38.2% for V60 and V80, respectively, due to the presence of martensite. |
Keyword | Laser Surface Melting Ferritic Stainless Steel Hydrogen Embrittlement Mechanical Properties |
DOI | 10.3390/coatings10020140 |
URL | View the original |
Indexed By | SCIE |
Language | 英語English |
WOS Research Area | Materials Science ; Physics |
WOS Subject | Materials Science, Multidisciplinary ; Materials Science, Coatings & Films ; Physics, Applied |
WOS ID | WOS:000522487300051 |
Publisher | MDPI AG |
The Source to Article | PB_Publication |
Scopus ID | 2-s2.0-85080879387 |
Fulltext Access | |
Citation statistics | |
Document Type | Journal article |
Collection | DEPARTMENT OF ELECTROMECHANICAL ENGINEERING Faculty of Science and Technology INSTITUTE OF APPLIED PHYSICS AND MATERIALS ENGINEERING |
Corresponding Author | Kwok, C. T. |
Affiliation | 1.Department of Electromechanical Engineering,Faculty of Science and Technology,University of Macau,Macau,999078,China 2.Institute of Applied Physics and Materials Engineering,University of Macau,Macau,999078,China |
First Author Affilication | Faculty of Science and Technology |
Corresponding Author Affilication | Faculty of Science and Technology; INSTITUTE OF APPLIED PHYSICS AND MATERIALS ENGINEERING |
Recommended Citation GB/T 7714 | Chan, W.K.,Kwok, C. T.,Lo, K. H.. Mechanical Properties and Hydrogen Embrittlement of Laser-Surface Melted AISI 430 Ferritic Stainless Steel[J]. Coatings, 2020, 10(2), 140. |
APA | Chan, W.K.., Kwok, C. T.., & Lo, K. H. (2020). Mechanical Properties and Hydrogen Embrittlement of Laser-Surface Melted AISI 430 Ferritic Stainless Steel. Coatings, 10(2), 140. |
MLA | Chan, W.K.,et al."Mechanical Properties and Hydrogen Embrittlement of Laser-Surface Melted AISI 430 Ferritic Stainless Steel".Coatings 10.2(2020):140. |
Files in This Item: | There are no files associated with this item. |
Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.
Edit Comment