Effect of post-weld heat treatment on microstructure and mechanical properties of deep penetration autogenous TIG-welded dissimilar joint between creep strength enhanced ferritic steel and austenitic stainless steel

Autor:	Wen Huang, Zhenyu Fei, Zengxi Stephen Pan, Huijun Li, Zhifang Peng, Dominic Cuiuri
Rok vydání:	2020
Předmět:	0209 industrial biotechnology Toughness Materials science Mechanical Engineering Gas tungsten arc welding Metallurgy Charpy impact test 02 engineering and technology Welding engineering.material Microstructure Industrial and Manufacturing Engineering Computer Science Applications law.invention 020901 industrial engineering & automation Creep Control and Systems Engineering law engineering Austenitic stainless steel Software Tensile testing
Zdroj:	The International Journal of Advanced Manufacturing Technology. 108:3207-3229
ISSN:	1433-3015 0268-3768
DOI:	10.1007/s00170-020-05605-2
Popis:	The present study centres on the effect of post-weld heat treatment (PWHT) on microstructure and mechanical properties of the deep penetration keyhole Tungsten Inert Gas (K-TIG) welded dissimilar joint between creep strength enhanced ferritic (CSEF) steel and austenitic stainless steel (ASS). The as-received normalized and tempered CSEF steel was joined with ASS in a single pass without using any filler materials and edge preparation. Detailed characterization across the welded joint was conducted using stereomicroscope, electron microscopy, energy dispersive spectroscopy (EDS), electron backscattered diffraction (EBSD), hardness test, tensile test and Charpy impact test. Results showed that PWHT had significant effect on the microstructure and mechanical properties of both the weld metal and CSEF steel heat-affected zone (HAZ), while it had little influence on the ASS side. By using proper PWHT, the hardness gradient across the welded joint could be mitigated and toughness in both the weld metal and the CSEF steel HAZ could be restored. 760 °C was considered the most appropriate PWHT temperature for such dissimilar joint in terms of the overall mechanical properties. The tensile properties of K-TIG welded joint after PWHT were comparable to both friction stir welded joint and laser and/or electron beam welded joint, indicating that deep penetration TIG welding technology may provide a good alternative for the nuclear industry. The correlation among welding thermal cycle, various heat treatment, microstructure evolution and mechanical properties was also analysed in detail.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::1c775163ec75c7717602d5619ddc43fd https://doi.org/10.1007/s00170-020-05605-2 Zobrazit plný text záznamu Plný text ve formátu PDF Plný text ve formátu HTML
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