Abstract
Laser surface modification is an emerging process that can produce texture on a work surface and effectively enhance surface topography while altering surface roughness. Laser surface modification is a sensitive process that depends on various laser processing parameters such as power, scanning speed, hatching distance. The significance of this work is to examine the influence of hatching distance on the surface characteristic of 2205 duplex stainless steel samples. The surface transformation and variation of the surface roughness properties of the materials were examined. The hatching distance was varied from 0.1 to 0.005 mm. Results indicate that, as the hatch spacing decreases, the overlap of laser track increases, thereby resulting in a decrease of surface roughness. Meanwhile, with the increase of hatch distance, the clear overlay tracks were transformed to irregular wavy surface. The best hatch distance parameter obtained was 100 μm that resulted in the highest roughness of 8.45 μm. Experimental results illustrate that, when the optimum hatch distance of 100 μm was adopted, the polished smooth surface of 2205 duplex stainless steel with initial average roughness value of 0.19 μm increased by 42 times of the polished surface roughness. A strong correlation between hatching distance and roughness was established in 2205 duplex stainless steel. High depth of the altered surface topography and increased roughness were linked to higher levels of hatching distance.
Highlights
Duplex stainless steel (DSS) is commonly used for structural components for industries such as chemical, and oil and gas, owing to its excellent resistance to corrosion in environments containing chloride [1]
It can be observed that the change of the hatch distance itself has a considerable impact on the surface topography
According to Foster et al [11], more valley and hill types were created on the surface by increasing the hatch distance, which affected the surface roughness
Summary
Duplex stainless steel (DSS) is commonly used for structural components for industries such as chemical, and oil and gas, owing to its excellent resistance to corrosion in environments containing chloride [1]. According to Carvalho et al [3] paper, the research mentioned that the surface modification changes in the corrosion properties induced by the treatment of outer-surface of stainless steel without modification of the bulk material. Optimisation of this surface properties may improve the material behaviour. Laser surface modification (LSM) has been commonly used to enhance resistance to wear and corrosion of mechanical components. LSM changes the characteristics of the materials’ surface by introducing high thermal energy through the high energy of laser beam, while the conventional treatment process usually involves physical contact with the material surface. This research is focused on the enhancement of surface properties and the role of various parameters in the LSM process by using fibre laser on DSS 2205
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