The Influence of Intercritic Quenching in Ultrasonic Field on the Mechanical Properties of a Dual-Phase Steel Determined by Universal Hardness Test

Abstract

In this article, the authors present the cooling influence in ultrasonic field on the mechanical properties of a dual-phase steel with 0.09% C and 1.90% Mn obtained by intercritical quenching. The heat treatment consisted of heating to 740°C, maintaining for 30 minutes and then cooling in water and water in ultrasonic field. Mechanical properties have been highlighted through universal hardness testing; were determined: Martens hardness (HM), Martens hardness from the slope of the increasing force/indentation depth curve (HM S ), indentation hardness (H IT ), elastic indentation modulus (E IT ), indentation creep (C IT ), elastic (η IT ) and plastic (η plast ) parts of the