Repair of 304 stainless steel by laser cladding with 316L stainless steel powders followed by laser surface alloying with WC powders

2016 ◽  
Vol 24 ◽  
pp. 116-124 ◽  
Author(s):  
Lijun Song ◽  
Guangcheng Zeng ◽  
Hui Xiao ◽  
Xianfeng Xiao ◽  
Simeng Li
Keyword(s):  
Stainless Steel ◽  
Laser Cladding ◽  
316L Stainless Steel ◽  
Laser Surface ◽  
304 Stainless Steel ◽  
Surface Alloying ◽  
Laser Surface Alloying

LASER SURFACE ALLOYING OF 304 STAINLESS STEEL WITH TUNGSTEN POWDER

2020 ◽  
pp. 2050033
Author(s):  
BAOSHUAI DU ◽  
ZHONGWEN ZHANG ◽  
SHUAI SUO ◽  
XINMEI LI ◽  
HUALING DENG
Keyword(s):  
Stainless Steel ◽  
Laser Fluence ◽  
Tungsten Powder ◽  
Steel Substrate ◽  
Intermetallic Phase ◽  
Laser Surface ◽  
304 Stainless Steel ◽  
Surface Alloying ◽  
Corrosion Properties ◽  
Laser Surface Alloying

Laser surface alloying was employed to enhance the wear resistance of 304 stainless steel with pure tungsten powder. The effect of laser fluence on phase constituents, microstructure, hardness and corrosion properties was investigated. It is found that the laser fluence has a direct correlation with the phases present in the coatings. Intermetallic Fe7W6 phase was found in the composite coating due to the metallurgical reaction of W with the Fe, Cr and Ni elements in the melting pool. Coatings with composite microstructure in nature were obtained resulting from the dilution of substrate and the laser-induced rapid cooling process. Intermetallic phase of Fe7W6 with solid solution of Ni and Cr shows dendrite or hallo structure depending on the laser fluence. Sintering and/or consolidation of W particles is observed for samples processed with lower laser fluences. It has been found that hardness of the coatings was improved significantly compared with the 304 stainless steel substrate. Coating processed with laser fluence of [Formula: see text] J/m2 shows the best corrosion resistance.

Hardening of 316L stainless steel by laser surface alloying

1995 ◽  
Vol 30 (14) ◽  
pp. 3652-3657 ◽  
Author(s):  
F. Laroudie ◽  
C. Tassin ◽  
M. Pons
Keyword(s):  
Stainless Steel ◽  
316L Stainless Steel ◽  
Laser Surface ◽  
Surface Alloying ◽  
Laser Surface Alloying

The corrosion resistance of low concentration ruthenium laser alloyed 304L stainless steel exposed to sulphuric acid at 25°C

2018 ◽  
Vol 65 (3) ◽  
pp. 263-270
Author(s):  
Josias Willem Van der Merwe ◽  
Ndivhuwo Brayner Nelwalani
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
Sulphuric Acid ◽  
Laser Surface ◽  
304 Stainless Steel ◽  
304L Stainless Steel ◽  
Laser Alloying ◽  
Surface Alloying ◽  
Content Type ◽  
Laser Surface Alloying

Purpose This paper aims to study the effect of small ruthenium additions through laser surface alloying of 304L stainless steel on the corrosion resistance when exposed to a 1 M sulphuric acid solution at 25°C. Design/methodology/approach In this study, the characteristics of laser-alloyed surface layers enriched with low concentrations of ruthenium, less than 0.3 Wt.%, were evaluated. Samples were manufactured by performing laser surface alloying on a 304L stainless steel and using a 304 stainless steel powder enriched with ruthenium. The welded surfaces were cross-sectioned and the microstructure and chemical composition were analysed; in addition, the depth of penetration was determined. The corrosion characteristics of these surface welds were investigated through electrochemical analysis such as open circuit potential measurements and potentiodynamic scans. Findings It was found that with the addition of ruthenium levels of more than 0.2 Wt.%, the corrosion characteristics when exposed to 1 M sulphuric acid improved in the enriched welded zone. Research limitations/implications This study investigated the improvement of the surface layer of the 304L stainless steel because of the cost involved when ruthenium is alloyed in the bulk and showed that an improved corrosion resistance can be achieved in sulphuric acid at room temperature. Practical implications The hardness of the laser alloying was not significantly affected by the ruthenium, but more by the laser parameters. Originality/value This paper considers the improvement of 304L stainless steel through laser alloying with ruthenium.

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