Encyclopedia
Super 13% Cr steels are used for offshore applications and have to meet strict tensile strength, yield strength, toughness, elongation, and hardness specifications. The mechanical properties of these steels are strongly dependent on the proportions of retained austenite and martensite, and consequently small changes in heat treatment parameters result in major changes in properties.
- Supermartensitic stainless steel,
- reverted austeni
- transformation mechanisum
In this work, a detailed investigation of the effect of heat treatment parameters on microstructural features, hardness and tensile properties of the commercial supermartensitic 13Cr-5Ni-2Mo steels in the asreceived and re-heat treated state were undertaken. The re-heat treatment was performed by re-austenitising the samples at 950 °C for 2 h, air-cooling, and then tempering (single and double temper) in the range of 550-700 °C. The effects of tempering temperature, time, and their combination P (P = (273+T (°C) x (40 + login t (h)) x 1000'1), the Holloman-Jaffe parameter, on retained austenite volume fraction, hardness and tensile properties were investigated.
