Effect of Laser Surface Melting on Chromium Carbide of 304 Stainless Steels

Jafar, Sami I.; Kadhim, Mohammad J.; Faayadh, Sameer K.

doi:10.30684/etj.36.3a.14

Cited by 3 publications

(2 citation statements)

References 23 publications

(32 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Samples (a) and (b) of the laser-treated samples showed slightly higher hardness compared to samples (c) and (d), which can be attributed to a higher level of martensite Figure 6B provides a graphical representation of the surface fraction occupied by different grain size ranges across all the analyzed samples. It is well established that laser parameters such as power and scanning speed can be adjusted to control the grain size during laser surface treatment [62,63]. The results indicate that LST applied to MASS results in an increase in the surface fraction occupied by fine grains in the majority of the samples and therefore demonstrates the capability of laser treatments to promote grain refinement in the examined materials.…”

Section: Hardnessmentioning

confidence: 90%

Investigating the Effect of Nanosecond Laser Surface Texturing on Microstructure and Mechanical Properties of AISI 301LN

Rezayat,

Besharatloo,

Mateo

2023

Metals

View full text Add to dashboard Cite

This study explores pulsed Nd:YLF laser surface modification (LSM) effects on AISI 301LN stainless steel. Laser-treated surfaces underwent SEM characterization, revealing patterns and irregularities. Higher heat input surfaces showed significant microstructural changes, while lower heat input surfaces experienced less alteration. Increased laser spot overlap led to larger exposed areas and higher heat input, influencing groove width, depth, and surface roughness. Three-dimensional reconstructions illustrated the correlation between laser parameters and surface characteristics. XRD (X-ray diffraction analysis) and EBSD (Electron backscatter diffraction) analyses revealed a transformation from austenite to martensite, with an increase in the α’-martensite phase, particularly in patterns with high laser power, attributed to rapid cooling during laser modification. Grain size analysis indicated a 42% reduction post-treatment, enhancing the surface fraction of fine grains. Hardness measurements demonstrated an overall increase in laser-treated samples, linked to fine-grained microstructure formation, induced residual stresses, and the α’-martensitic phase.

show abstract

Section: Hardnessmentioning

confidence: 90%

Investigating the Effect of Nanosecond Laser Surface Texturing on Microstructure and Mechanical Properties of AISI 301LN

Rezayat,

Besharatloo,

Mateo

2023

Metals

View full text Add to dashboard Cite

show abstract

“…The initial structure of steel does not influence too much microstructure of the surface layers forming during its laser re-solidification. Only in the case of steels having very large carbide particles in the matrix un-dissolved carbides are still observed in the re-solidified layer [15, 16, 17, and 18] the thermos -physical properties of the used material, and laser traversing rate are directly affected by heating and cooling range [8]. The laser-heated area is very small.…”

Section: Introductionmentioning

confidence: 99%

Improvement of Microstructure and Wear resistance of X12 Tool Steel by Using Laser Surface Re-Melting Technique

Al-Tamimi

Al-Roubaiy

Dawood

2021

MSF

View full text Add to dashboard Cite

Nd-YAG lasers have been successfully used in recent years as reliable heat source to surface modification of engineering materials such as laser surface re-melting. In the present study, X12 tool steel was surface modified by using pulse Nd-YAG laser technique. Laser parameters are selected of 12 J pulse energy, 15 Hz frequency, 20 mm defocus length, 6 ms pulse duration, and 5.6 mm /s mm scanning speed. These parameters were chosen after undertaking trials to give suitable parameters in this process. Optical microscopy and backscattered scanning electron microscopy (SEM) with EDS and X-ray diffraction techniques were used to analyse the microstructure changes of the surface of tool steel. Wear resistance test was achieved by using a pin on disk method. The reason for this work is to improve the wear resistance for surface layer of tool steel after changes the morphology of the structure by rapid solidification during laser re-melting. In general, the structure consists of the dendrite and cellular structures with δ ferrite formed under conditions of rapid solidification without the primary coarse carbides. After laser melting, the results of the structure at the surface layers show an increase in wear resistance.

show abstract