Heat Treatment Influence on LCF Properties of X20Cr13 Stainless Steel

The present paper deals with analyzing the influence of mechanical parameters of quenched and tempered X20Cr13 Stainless Steel on the LCF properties. Specimens were heated to 1000°C, kept in this temperature for 45 minutes and subsequently quenched in oil to room temperature, then heated to 550°C, 620°C or 700°C (for different specimens), kept in the heat for 15 minutes and cooled to the room temperature, in order to obtain required hardness. Micro-hardness and hardness of the structure in transversal specimen section were measured. The LCF tests were carried out for three different strain amplitudes between 0.5% and 1.5%. Relationships between hardness, strain amplitude and low cycle fatigue life were also determined.