Article ID Journal Published Year Pages File Type
614077 Tribology International 2016 11 Pages PDF
Abstract

•AISI 420 Low Temperature Plasma Carburizing (LTPC) with different time (4–16 h) and temperature (350–500 °C).•LTPC produced a diffusion zone, sometimes covered with an outer, thin layer (<5 µm).•Dry sliding behavior was related to microstructural features and microhardness.•Dominant wear mechanism: mild tribo-oxidative wear.•Wear decreases if a thick diffusion layer with no outer layer is produced by LTPC (450 °C, 12 h).

This paper reports on the dry sliding behavior (block-on-ring tests) of Low-Temperature Plasma Carburized (LTPC) AISI 420 martensitic stainless steel, treated under different times (4–16 h) and temperatures (350–500 °C), so as to identify the relationships between microstructure, micro-hardness and tribological behavior. In particular, LTPC was effective in decreasing wear when treatment conditions led to the highest diffusion layer thickness combined with absence of a thick outer layer (i.e. at 450 °C for a treatment time of 12 h). The dominant wear mechanism was mild tribo-oxidation, with the protective oxide tribolayer being partly removed by abrasive debris in samples treated at 500 °C.

Related Topics
Physical Sciences and Engineering Chemical Engineering Colloid and Surface Chemistry
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