Influence of a TiAlN coating on the mechanical properties of a heat resistant steel at room temperature and 650 °C

Abstract

A TiAlN coating was deposited on a heat resistant steel X12CrMoWVNbN10-1-1 by vacuum arc ion plating. The tensile and fatigue properties of the coated steel were investigated at room temperature (RT) and 650 °C. The results reveal that the TiAlN coating is compact, on which a small number of large particle and pits are present. The Ti/Al atomic ratio in the coating is about 0.94. The average hardness of the coating is 1 868 HV0.1 and the interface bonding force between TiAlN coating and the substrate is about 31 N. The elastic modulus and the strength of the steel are improved by the deposition of TiAlN coating. The influence of the TiAlN coating on the tensile properties of the steel can be ignored at both RT and 650 °C. Moreover, there is no obvious decrease of the fatigue limit of substrate when the steel is coated by the coating at the investigated temperature.

Keywords

TiAlN coating / tensile / fatigue / vacuum arc ion plating

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