Characterization of a Laser Surface-Treated Martensitic Stainless Steel

Abstract

Laser surface treatment was carried out on AISI 416 machinable martensitic stainless steel containing 0.225 wt.% sulfur. Nd:YAG laser with a 2.2-KW continuous wave was used. The aim was to compare the physical and chemical properties achieved by this type of selective surface treatment with those achieved by the conventional treatment. Laser power of different values (700 and 1000 W) with four corresponding different laser scanning speeds (0.5, 1, 2, and 3 m·min−1) was adopted to reach the optimum conditions for impact toughness, wear, and corrosion resistance for laser heat treated (LHT) samples. The 0 °C impact energy of LHT samples indicated higher values compared to the conventionally heat treated (CHT) samples. This was accompanied by the formation of a hard surface layer and a soft interior base metal. Microhardness was studied to determine the variation of hardness values with respect to the depth under the treated surface. The wear resistance at the surface was enhanced considerably. Microstructure examination was characterized using optical and scanning electron microscopes. The corrosion behavior of the LHT samples was also studied and its correlation with the microstructures was determined. The corrosion data was obtained in 3.5% NaCl solution at room temperature by means of a potentiodynamic polarization technique.

Structural and Micromechanical Properties of Nd:YAG Laser Marking Stainless Steel (AISI 304 and AISI 316)

“…Moreover, it can be seen that main γ-Fe peaks persist for each irradiated sample within slight changes in its intensity. This appears to be in accordance with results reported by different authors [42][43][44][45]. Alongside austenitic specimens, the α'-Fe peaks (2θ = 44.7 • ; 82.3 • ) can be reported for two samples, structured with pulsed frequencies of f = 100 kHz and f = 10 kHz and a scanning speed of v = 80 mm/s.…”

Degradation mechanisms in martensitic stainless steels: Wear, corrosion and tribocorrosion appraisal

“…Surface analysis techniques were employed to carry out the metallographic studies before and/or after the electrochemical tests, and to analyze the different corrosion mechanisms. The most used techniques were optical microscopy and Scanning Electron Microscopy (SEM), which provides general information about the miscrostructure and/or the surface morphology after the corrosion tests [6,52,38,56,58,60,[63][64][65][66][67][68][69][70][71][72]. Some studies were focused on the study of microstructural properties and/or the surface treatments and coatings of martensitic stainless steels.…”

“…Some studies were focused on the study of microstructural properties and/or the surface treatments and coatings of martensitic stainless steels. For that purpose, surface analysis such as X-Ray Diffraction (XDR), Transmission Electron microscopy (TEM) and Electron Backscattered Diffraction (EBSD) were used in the reviewed studies [42,48,49,57,61,64,66,67,[71][72][73][74][75][76][77][78]. The X-Ray Photoelectron Spectroscopy (XPS) is a useful tool to characterize the surface chemistry, i.e.…”

Определение Параметров Зон Лазерной Закалки Сталей И Их Трибологических Характеристик

“…Laser hardening of AISI 416 martensitic stainless steel with a carbon content of 0.167% was carried out on samples with dimensions of 55 × 10 × 7.5 mm with an initial hardness of 155 HV [2]. Nd : YAG laser (Rofin-Sinar) was used with a maximum radiation power of 2.2 kW.…”

“…Лазерное упрочнение мартенситной нержавеющей стали AISI 416 с содержанием углерода 0,167% проводили на образцах с размерами 55 × 10 × 7,5 мм с исходной твердостью 155 HV [2]. Использовали лазер Nd : YAG фирмы «Рофин-Синар» с максимальной мощностью излучения 2,2 кВт.…”