Atomic migration of carbon in hard turned layers of carburized bearing steel

Journal Article · Fri Jan 01 00:00:00 EST 2016 · CIRP Annals

DOI:https://doi.org/10.1016/j.cirp.2016.04.009· OSTI ID:1286952

Bedekar, Vikram ^[1]; Poplawsky, Jonathan D. ^[2]; Guo, Wei ^[2]; Shivpuri, Rajiv  ^[3]; Scott Hyde, R. ^[1]

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1. Timken World Headquarters, North Canton, OH (United States)
2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
3. The Ohio State Univ., Columbus, OH (United States)

In grain finement and non-equilibrium there is carbon segregation within grain boundaries alters the mechanical performance of hard turning layers in carburized bearing steel. Moreover, an atom probe tomography (APT) study on the nanostructured hard turning layers reveals carbon migration to grain boundaries as a result of carbide decomposition during severe plastic deformation. In addition, samples exposed to different cutting speeds show that the carbon migration rate increases with the cutting speed. For these two effects lead to an ultrafine carbon network structure resulting in increased hardness and thermal stability in the severely deformed surface layer.

• Research Organization: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS)
• Sponsoring Organization: USDOE Office of Science (SC)
• Grant/Contract Number: AC05-00OR22725
• OSTI ID: 1286952
• Journal Information: CIRP Annals, Vol. 65, Issue 1; ISSN 0007-8506
• Publisher: Elsevier
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
Hard machining
Nano structure
Carbon migration