Eventos Anais de eventos
COBEM 2019
25th International Congress of Mechanical Engineering
INFLUENCE OF COLLING/HEATING RATE ON AISI M2 TOOL STEEL SUBJECTED TO DEEP CRYOGENIC TREATMENT
Submission Author:
Deividi Amaral Mengotti , RS
Co-Authors:
Deividi Amaral Mengotti, Enrique Silva, Luiz Felipe Leonardi, Thauan de Oliveira Littiere, Dirceu Antonio Tomazine Junior, Dieison Fantineli, Marco Antonio Durlo Tier, Inácio Limberger
Presenter: Deividi Amaral Mengotti
doi://10.26678/ABCM.COBEM2019.COB2019-1650
Abstract
The present research focuses on the optimization of the AISI M2 tool steel after deep cryogenic treatment. The cryogenic treatment was performed varying the rate of cooling and the rate of return to the ambient temperature during cryogenics. The samples were austenitized at 1200 ºC and quenched. After this, deep cryogenic treatment was performed in four different rates. The samples from Group A were subjected to a cooling to -181 ± 1 °C rate and heating up to room temperature of 0.5 °C / min; The samples from Group B were cooled and heated at a rate of approximately 1.68 °C / min; The samples from Group C were directly immersed in liquid nitrogen at -196 °C while samples from Group D were not subjected to DCT treatment. After the deep cryogenic treatment, all samples were double tempered at 550 °C during 2h each. HRC hardness test, Charpy and wear tests were performed. Statistical analysis of the results showed that deep cryogenic treatment resulted in an increase of 57.55% in toughness obtained in the Charpy impact test and 72.58% increase in the hardness. Also the deep cryogenic treatment represents a 23.09% increase in the wear resistance, these results are in relation to the samples without cryogenic treatment.
Keywords
Wear, secondary carbide, hardness, Toughness
