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

被引：9

作者：

Bedekar, Vikram ^{[1
]}

Poplawsky, Jonathan D. ^{[2
]}

Guo, Wei ^{[2
]}

Shivpuri, Rajiv ^{[3
]}

Hyde, R. Scott ^{[1
]}

机构：

[1] Timken World Headquarters, Mat Sci Res & Dev, North Canton, OH 44720 USA

[2] Oak Ridge Natl Lab, Ctr Nanophase Mat Sci, Oak Ridge, TN 37830 USA

[3] Ohio State Univ, Dept Integrated Syst Engn, Columbus, OH 43210 USA

来源：

CIRP ANNALS-MANUFACTURING TECHNOLOGY | 2016年 / 65卷 / 01期

关键词：

Hard machining; Nano structure; Carbon migration; WHITE LAYERS; CEMENTITE DECOMPOSITION; NANOCRYSTALLINE ALLOYS; PLASTIC-DEFORMATION; PROBE TOMOGRAPHY; SOLUTE; SEGREGATION; MECHANISMS; WIRE;

D O I：

10.1016/j.cirp.2016.04.009

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Grain finement and non-equilibrium carbon segregation within grain boundaries alters the mechanical performance of hard turning layers in carburized bearing steel. 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. These two effects lead to an ultrafine carbon network structure resulting in increased hardness and thermal stability in the severely deformed surface layer. (C) 2016 CIRP.

引用

页码：85 / 88

页数：4

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