Banca de DEFESA: FERNANDO GRAZZIOTIN

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : FERNANDO GRAZZIOTIN
DATE: 03/07/2023
TIME: 13:30
LOCAL: Google Meet
TITLE:

Study composition of bath composed of aluminum and sodium borate in the liquid boriding process in 0.4%C steel

KEY WORDS:

Thermochemical treatment. Sodium borate. Toughness. Boriding.

PAGES: 58
BIG AREA: Engenharias
AREA: Engenharia de Materiais e Metalúrgica
SUBÁREA: Metalurgia Física
SPECIALTY: Transformação de Fases
SUMMARY:

Boriding stands out in relation to other thermochemical treatments, mainly for obtaining high levels of hardness, resistance to wear and corrosion. Despite these significant characteristics, this processing is still little used commercially in Brazil. With the accomplishment of this work it is possible to verify some existing methods for carrying out the process of liquid boriding. Using different sources of boron, one can observe the results obtained for hardness, thickness, shape and phases present in the layer for the different studied compositions. During this study, SAE 1040 steel samples were used. Baths composed of 85% sodium borate and 15% aluminum, in addition to 70% sodium borate and 30% aluminum, considering the mass values, were tested. The boron-bearing reagents used for the analyzes were anhydrous sodium borate (𝐵ସ𝑁𝑎ଶ𝑂଻) for analysis (PA), hydrated sodium borate (𝐵ସ𝑁𝑎ଶ𝑂଻ ∙ 10𝐻ଶ𝑂) for analysis (PA) and commercial hydrated sodium borate (𝐵ସ𝑁𝑎ଶ𝑂଻ ∙ 10𝐻ଶ𝑂). The samples were subjected to a temperature of 950°C for a period of four hours in a muffle furnace. After carrying out the treatments, the samples were subjected to hardness tests, metallography and scanning electron microscopy (SEM) to characterize the results. Through the final results, it was evident that the composition of the bath with 30% aluminum obtained more significant results compared to the bath that used 15% aluminum. The formation of the characteristic sawtooth layer and also the high hardness were observed in the baths with 70% sodium borate and 30% aluminum. Biphasic layer formation with a thickness of up to 136 µm was also evidenced. In general, it can be seen that the sample whose bath composed of hydrated sodium borate PA resulted in more consistent properties

COMMITTEE MEMBERS:
Presidente - 1934288 - CINTHIA GABRIELY ZIMMER
Interna - 1446153 - DANIELA LUPINACCI VILLANOVA
Interno - 1804846 - JULIANO CANTARELLI TONIOLO
Externa à Instituição - CAMILA DOS SANTOS TORRES - UFSM