25.7.2021
Low Temperature Boronizing of Surface Nanostructured Ni-Cr-Mo Steel Using SMAT | Scientific.Net
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Low Temperature Boronizing of Surface Nanostructured
Ni-Cr-Mo Steel Using SMAT
943
Abstract:
Boronizing is a surface thermochemical treatment in which boron atoms are made
to diffuse into a metallic surface at high temperatures. A nano-crystalline surface
with larger defect density assists in enhancing the diffusion rate even at low
temperatures. In the present work Ni-Cr-Mo steel is subjected to a surface
mechanical attrition treatment (SMAT) to activate the surface with nanocrystalline
structures and crystal defects. Subsequently the samples were boronized at low
temperature regime (400°C - 600°C) for 5 hours using a pack boronizing technique.
The microstructure, chemical analysis and hardness of borided layers were
investigated using optical microscope, SEM – EDX and Microvicker’s Hardness Tester. The SMAT treated
samples showed severe plastic deformation of the surface, nano-structured grains (10-30 nm) and larger
defect density illustrating mechanically activated surface for diffusion. The boronizing had clearly
demonstrated the diffusion of boron even at 400°C. The thickness of diffused layer was found to be
about 20 µm at 400°C and 50 µm at 600°C for SMAT samples while the untreated samples showed
practically no diffusion at 400°C and 12 µm at 600°C. The SEM-EDX results had confirmed the presence of
boron at the diffused layer; however the hardness was found to be low. A maximum of 650 HV0.3 was
achieved by low temperature boronizing of SMAT treated samples.
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Info:
Periodical:
Materials Science Forum (Volumes 830-831)
Edited by:
P. Ramesh Narayanan and S.V.S. Narayana Murty
https://www.scientific.net/MSF.830-831.663 1/3
25.7.2021
Low Temperature Boronizing of Surface Nanostructured Ni-Cr-Mo Steel Using SMAT | Scientific.Net
Pages:
663-666
DOI:
https://doi.org/10.4028/www.scientific.net/MSF.830831.663
Citation:
Cite this paper
Online since:
September 2015
Authors:
G. Sreejith*, Teotia Sunny, J.N. Sahu, Chandrabalan
Sasikumar
Keywords:
Boronizing, Low Temperature Diffusion, SMAT, Surface
Nanocrystallization
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https://www.scientific.net/MSF.830-831.663 2/3
25.7.2021
Low Temperature Boronizing of Surface Nanostructured Ni-Cr-Mo Steel Using SMAT | Scientific.Net
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https://www.scientific.net/MSF.830-831.663 3/3