Influence of heating rate on the laser surface hardening of a medium carbon steel

1988 ◽  
Vol 34 (3) ◽  
pp. 319-330 ◽  
Author(s):  
S.-J. Na ◽  
Y.-S. Yang
Keyword(s):  
Carbon Steel ◽  
Heating Rate ◽  
Surface Hardening ◽  
Medium Carbon Steel ◽  
Laser Surface ◽  
Medium Carbon ◽  
Laser Surface Hardening

A complete residual stress model for laser surface hardening of complex medium carbon steel components

2016 ◽  
Vol 302 ◽  
pp. 100-106 ◽  
Author(s):  
Erica Liverani ◽  
Adrian H.A. Lutey ◽  
Alessandro Ascari ◽  
Alessandro Fortunato ◽  
Luca Tomesani
Keyword(s):  
Residual Stress ◽  
Carbon Steel ◽  
Surface Hardening ◽  
Medium Carbon Steel ◽  
Laser Surface ◽  
Complex Medium ◽  
Stress Model ◽  
Medium Carbon ◽  
Laser Surface Hardening

Water-Jet Assisted Laser Surface Hardening of Medium Carbon Steel Using Fiber Laser

2018 ◽  
Author(s):  
Sagar Sarkar ◽  
Ashish Kumar Nath
Keyword(s):  
Surface Hardening ◽  
High Hardness ◽  
Medium Carbon Steel ◽  
Water Jet ◽  
Laser Surface ◽  
Peak Hardness ◽  
Bottom Surface ◽  
Thin Sheets ◽  
Laser Surface Hardening ◽  
Conventional Laser

Laser surface hardening of most of the industrial components require depth of surface modification in the range of 100–150 micron. Conventional laser surface hardening uses laser as a heat source to modify a particular area of the surface without melting in an inert gas environment. However, the hardened profile in this case shows peak hardness value at a certain depth from the top surface. Also, hardening the top surface to get relatively much higher hardness near the top surface in case of thin sheets becomes difficult due to accumulation of heat below the surface of the specimen which in turn lowers the cooling rate. Hence, self-quenching becomes inadequate. In the present study, an in-house fabricated laser processing head with coaxial water nozzle has been used to flow a laminar water-jet during the laser surface hardening process to induce forced convection at the top surface. Thus, heat gets carried away by the water-jet from the top surface and by the water from the bottom surface as well. Results show that with judicious selection of process parameters, it is possible to get higher hardness (800 HV) to that of conventional laser surface hardening (500 HV) at the top surface using this process. Present process can be used for those cases where high hardness values are required near the top surface specially for thin sheets and thermally sensitive materials.

Effect of laser surface hardening on magnetic characteristics of a carbon steel under loading

2008 ◽  
Vol 44 (8) ◽  
pp. 560-565 ◽  
Author(s):  
E. S. Gorkunov ◽  
S. Yu. Mitropol’skaya ◽  
S. M. Zadvorkin ◽  
A. L. Osintseva ◽  
D. I. Vichuzhanin
Keyword(s):  
Carbon Steel ◽  
Surface Hardening ◽  
Laser Surface ◽  
Magnetic Characteristics ◽  
Laser Surface Hardening

Laser surface alloying of medium carbon steel with SiC(P)

2003 ◽  
Vol 423 (1) ◽  
pp. 41-53 ◽  
Author(s):  
G Thawari ◽  
G Sundarararjan ◽  
S.V Joshi
Keyword(s):  
Carbon Steel ◽  
Medium Carbon Steel ◽  
Laser Surface ◽  
Surface Alloying ◽  
Medium Carbon ◽  
Laser Surface Alloying

scholarly journals Effect of Ultra-Fast Heat Treatment on the Subsequent Formation of Mixed Martensitic/Bainitic Microstructure with Carbides in a CrMo Medium Carbon Steel

Metals ◽  
2019 ◽  
Vol 9 (3) ◽  
pp. 312 ◽  
Author(s):  
Spyros Papaefthymiou ◽  
Alexandros Banis ◽  
Marianthi Bouzouni ◽  
Roumen Petrov
Keyword(s):  
Heat Treatment ◽  
Carbon Steel ◽  
Heating Rate ◽  
Medium Carbon Steel ◽  
Significant Heterogeneity ◽  
Subsequent Formation ◽  
Heated Sample ◽  
Medium Carbon ◽  
Conventional Heat Treatment ◽  
Final Microstructure

The current work focuses on complex multiphase microstructures gained in CrMo medium carbon steel after ultra-fast heat treatment, consisting of heating with heating rate of 300 °C/s, 2 s soaking at peak temperature and subsequent quenching. In order to better understand the microstructure evolution and the phenomena that take place during rapid heating, an ultra-fast heated sample was analyzed and compared with a conventionally treated sample with a heating rate of 10 °C/s and 360 s soaking. The initial microstructure of both samples consisted of ferrite and spheroidized cementite. The conventional heat treatment results in a fully martensitic microstructure as expected. On the other hand, the ultra-fast heated sample shows significant heterogeneity in the final microstructure. This is a result of insufficient time for cementite dissolution, carbon diffusion and chemical composition homogenization at the austenitization temperature. Its final microstructure consists of undissolved spheroidized cementite, nano-carbides and martensite laths in a ferritic matrix. Based on EBSD and TEM analysis, traces of bainitic ferrite are indicated. The grains and laths sizes observed offer proof that a diffusionless, massive transformation takes place for the austenite formation and growth instead of a diffusion-controlled transformation that occurs on a conventional heat treatment.

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