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- Title
The Effect of Surface Finish on Low-Temperature Acetylene-Based Carburization of 316L Austenitic Stainless Steel.
- Authors
Ge, Yindong; Ernst, Frank; Kahn, Harold; Heuer, Arthur
- Abstract
We observed a strong influence of surface finish on the efficacy of low-temperature acetylene-based carburization of AISI 316L austenitic stainless steel. Steel coupons were prepared with different surface finishes prior to carburization, from P400 SiC grit paper to 1- µm-diameter-diamond-paste. The samples with the finer surface finish developed a thicker 'case' (a carbon-rich hardened surface layer) and a larger surface carbon concentration. Transmission electron microscopy revealed that the differences arose mainly from the nature of the deformation-induced disturbed layer on the steel surface. A thick (>400 nm) disturbed layer consisting of nano-crystalline grains (≈10 nm diameter) inhibits acetylene-based carburization. The experimental observations can be explained by assuming that during machining or coarse polishing, the surface oxide layer is broken up and becomes incorporated into the deformation-induced disturbed layer. The incorporated oxide-rich films retard or completely prevent the ingress of carbon into the stainless steel.
- Subjects
SURFACE chemistry; LOW temperatures; CARBURIZATION; AUSTENITIC stainless steel; SURFACE hardening; TRANSMISSION electron microscopy
- Publication
Metallurgical & Materials Transactions. Part B, 2014, Vol 45, Issue 6, p2338
- ISSN
1073-5615
- Publication type
Article
- DOI
10.1007/s11663-014-0141-9