Fast Salt Bath Heat Treatment for a Bainitic/Martensitic Low-Carbon Low-Alloyed Steel

摘要

The mechanical properties of a low-alloyed steel with 0.06 wt pct C were investigated after a series of heat treatment processes using salt bath followed by quenching into water in order to obtain bainitic/martensitic steel. Salt bath holding time varied from 30 to 330 seconds. Hardness, tensile properties and toughness have been examined. The results show the obtained microstructure significantly enhances the impact strength (up to 187 J) and toughness (up to 71.4 pct critical reduction) with good hardness (239 +/- A 4 HV) and tensile strength (720 to 800 MPa) compared to direct quenching heat treatment without salt bath holding. (C) The Minerals, Metals & Materials Society and ASM International 2015