scholarly journals Effect of Laser Surface Remelting on the Corrosion Resistance of 316L Orthodontic Brackets

2016 ◽  
pp. 2877-2886 ◽  
Author(s):  
Xiao-Yan ZHANG ◽  
Keyword(s):  
Corrosion Resistance ◽  
Laser Surface ◽  
Orthodontic Brackets ◽  
Laser Surface Remelting

Effects of Laser Processing Parameters on Grain Boundary Character Distribution and Corrosion Resistance of Austenite Stainless Steel

2007 ◽  
Vol 561-565 ◽  
pp. 2473-2476 ◽  
Author(s):  
Sen Yang ◽  
Hiroyuki Kokawa ◽  
Zhan Jie Wang
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
Laser Processing ◽  
Processing Parameters ◽  
Laser Surface ◽  
304 Stainless Steel ◽  
Grain Boundary Character Distribution ◽  
Grain Boundary Character ◽  
Laser Surface Remelting ◽  
Character Distribution

In order to modify grain boundary character distribution (GBCD) and to improve intergranualr corrosion (IGC) resistance of 304 stainless steel, laser surface remelting experiments were conducted on 304 stainless steel using a 2kW CW Nd: YAG laser, and the effects of laser processing parameters on GBCD and corrosion resistance were investigated in detail under the optimal annealing condition (1220K 28h). The experimental results showed that combination of laser surface remelting and the following annealing treatment could change the GBCD remarkably and improve the IGC resistance of 304 stainless steel. However, there are no obvious effects of laser processing parameters on the final depth of the processed zone, although the depth of the molten pool increases with the increase of the laser output power or the decrease of the scanning velocity, and the subsequent GBCD and corrosion resistance.

Study on Corrosion Resistance and Mechanical Property of Welding HAZ Treated by Laser Surface Remelting

2013 ◽  
Vol 734-737 ◽  
pp. 2346-2350 ◽  
Author(s):  
Yan Li Li ◽  
Jia Rui Qi ◽  
Dan Feng Zhang ◽  
Ji Liu ◽  
Chao Li
Keyword(s):  
Mechanical Property ◽  
Corrosion Resistance ◽  
Corrosion Current ◽  
Processing Parameters ◽  
Electrochemical Analysis ◽  
Constructional Steel ◽  
Orthogonal Test ◽  
Laser Surface ◽  
Laser Remelting ◽  
Laser Surface Remelting

Welding is a main joint way of the alloy constructional steel. However, the welding HAZ is very sensitive to corrosion. In order to increase the corrosion resistance of the welding HAZ without reducing mechanical property of the parts simultaneously, the laser surface remelting was used to treat the welding HAZ in this study. According to the results of the orthogonal test, the optimized processing parameters were obtained. Based on the electrochemical analysis, the corrosion current of 30CrMnSi welding HAZ can be decreased by laser remelting technology. The corrosion resistance of the HAZ can be improved effectively. At the same time, the mechanical property of the treated welding HAZ was better compared with the untreated.

scholarly journals In Situ Formation of Ti47Cu38Zr7.5Fe2.5Sn2Si1Nb2 Amorphous Coating by Laser Surface Remelting

Materials ◽  
2019 ◽  
Vol 12 (22) ◽  
pp. 3660 ◽  
Author(s):  
Peizhen Li ◽  
Lingtao Meng ◽  
Shenghai Wang ◽  
Kunlun Wang ◽  
Qingxuan Sui ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Elastic Modulus ◽  
Laser Surface ◽  
Corrosion Mechanism ◽  
Amorphous Coating ◽  
Laser Surface Remelting ◽  
The Matrix ◽  
In Situ Formation ◽  
Amorphous Coatings

In previous studies, Ti-based bulk metallic glasses (BMGs) free from Ni and Be were developed as promising biomaterials. Corresponding amorphous coatings might have low elastic modulus, remarkable wear resistance, good corrosion resistance, and biocompatibility. However, the amorphous coatings obtained by the common methods (high velocity oxygen fuel, laser cladding, etc.) have cracks, micro-pores, and unfused particles. In this work, a Ti-based Ti47Cu38Zr7.5Fe2.5Sn2Si1Nb2 amorphous coating with a maximum thickness of about 100 μm was obtained by laser surface remelting (LSR). The in-situ formation makes the coating dense and strongly bonded. It exhibited better corrosion resistance than the matrix and its corrosion mechanism was discussed. The effects of LSR on the microstructural evolution of Ti-based prefabricated alloy sheets were investigated. The nano-hardness in the heat affected zone (HAZ) was markedly increased by 51%, meanwhile the elastic modulus of the amorphous coating was decreased by 18%. This demonstrated that LSR could be an effective method to manufacture the high-quality amorphous coating. The in-situ amorphous coating free from Ni and Be had a low modulus, which might be a potential corrosion-resistant biomaterial.

Effects of laser surface remelting on the molten salt corrosion resistance of yttria-stabilized zirconia coatings

2018 ◽  
Vol 44 (18) ◽  
pp. 22645-22655 ◽  
Author(s):  
Peng Yi ◽  
Javad Mostaghimi ◽  
Larry Pershin ◽  
Pengyun Xu ◽  
Xianghua Zhan ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Molten Salt ◽  
Laser Surface ◽  
Yttria Stabilized Zirconia ◽  
Stabilized Zirconia ◽  
Laser Surface Remelting ◽  
Salt Corrosion

The Laser Surface Remelting of Austenitic Stainless Steel

2010 ◽  
Vol 654-656 ◽  
pp. 2511-2514 ◽  
Author(s):  
Brytan Zbigniew ◽  
Mirołsaw Bonek ◽  
Leszek Adam Dobrzański ◽  
Daniele Ugues ◽  
Marco Actis Grande
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
Austenitic Stainless Steel ◽  
Stainless Steels ◽  
Laser Surface ◽  
Localized Corrosion ◽  
Beam Power ◽  
Dendritic Microstructure ◽  
Laser Surface Remelting ◽  
Power Rate

The laser surface remelting (LSR) process was successfully applied to restore localized corrosion resistance in sensitized stainless steel and also as a useful method to improve passivity of some martensitic stainless steels. The LSR process can be successfully applied to repair cracks and defects at the surface of highly thermo-mechanically loaded parts of stainless steel. The purpose of presented study was to evaluate the microstructure and properties of laser remelted surface of stainless steels. The wrought austenitic stainless steel and sintered in vacuum 316L type were studied. The laser treatment was performed with the use of high power diode laser (HPDL) and the influence of beam power of 0.7-2.1kW on the properties of the surface layer was evaluated. The geometrical characteristics and x-ray analysis of weld bead were studied as well as microhardness, surface roughness and corrosion resistance were measured. The increase of laser beam power of LSR resulted in the increase of hardness of sintered stainless steel due to the reduction of porosity and formation of fine dendritic and cellular-dendritic microstructure. The corrosion resistance of remelted surface increased for sintered materials, when remelted at 2.1kW. The wrought stainless steel revealed impairment of pitting corrosion when remelted at lower beam power rate.

Microstructural modification by laser surface remelting and its effect on the corrosion resistance of an Al–9wt%Si casting alloy

2008 ◽  
Vol 254 (9) ◽  
pp. 2763-2770 ◽  
Author(s):  
Wislei R. Osório ◽  
Noé Cheung ◽  
José Eduardo Spinelli ◽  
Kleber S. Cruz ◽  
Amauri Garcia
Keyword(s):  
Corrosion Resistance ◽  
Laser Surface ◽  
Casting Alloy ◽  
Microstructural Modification ◽  
Laser Surface Remelting

Application of Laser Surface Remelting in Grain Boundary Engineering

2010 ◽  
Vol 638-642 ◽  
pp. 2876-2881 ◽  
Author(s):  
Sen Yang ◽  
Hiroyuki Kokawa
Keyword(s):  
Corrosion Resistance ◽  
Grain Boundary ◽  
Intergranular Corrosion ◽  
Annealing Treatment ◽  
Processing Parameters ◽  
Laser Surface ◽  
304 Stainless Steel ◽  
Grain Boundary Character Distribution ◽  
Grain Boundary Engineering ◽  
Laser Surface Remelting

To improve intergranular corrosion resistance of 304 stainless steel, a novel method, laser surface remelting combined with annealing treatment was adopted, which resulted in a high population of low  CSL boundaries, especially, twin boundaries (3) on the surface of the processed specimens. The grain boundary character distribution and effect of laser processing parameters on it were investigated. The experimental results showed that the maximum frequency of the low  CSL boundaries could attain 88.6% under the optimal processing conditions. The high fraction of the low  CSL boundaries led to a high corrosion resistance to intergranular corrosion.

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