Eventos Anais de eventos
COBEM 2019
25th International Congress of Mechanical Engineering
STUDY OF MECHANICAL AND TRIBOLOGICAL PROPERTIES OF ABNT M2 STEEL THROUGH THE USE OF THERMAL AND CRYOGENIC TREATMENT
Submission Author:
Enrique Silva , RS
Co-Authors:
Enrique Silva, Deividi Amaral Mengotti, Luiz Felipe Leonardi, Marco Antonio Durlo Tier, Dieison Fantineli
Presenter: Deividi Amaral Mengotti
doi://10.26678/ABCM.COBEM2019.COB2019-0860
Abstract
Recent studies about cryogenic treatment uses temperatures as low as -190°C to strengthen metals because it is in this range that the retained austenite transforms to martensite and the precipitation of fine carbides occurs. In this way, the combination of conventional heat treatments together with cryogenic treatment plays an important role in improving the quality of mechanical components. For this reason, the present work aims to compare the performance of the combination of quenching, tempering and cryogenic varying the parameters of time, temperature and quantity of treatments to investigate which aspects influence the mechanical and tribological properties of ABNT M2 steel The cryogenic treatment was performed before tempering and after quenching. The samples were austenized at 1180ºC and quenched in oil, cryogenictreated at -181ºC during 24h with a ramp of -0.5ºC/min and the tempering was done at 550ºC for 2h. After that, were done the mechanical tests of hardness, microhardness, abrasion and charpy and the metallographic tests of optical microscopy and scanning electron microscopy to analyze the results. The steel that received double cryogenic treatment before double tempering obtained the best improvement in its mechanical properties.
Keywords
Heat treatment, Cryogenic treatment, High Speed Steel
