Submitted by Setor de Tratamento da Informa??o - BC/PUCRS (tede2@pucrs.br) on 2016-09-27T12:28:48Z No. of bitstreams: 1 TES_CESAR_ROLANDO_NUNURA_NUNURA_COMPLETO.pdf: 7025675 bytes, checksum: fe9a9c1bc68c18e3f29d77b89573af7b (MD5) / Made available in DSpace on 2016-09-27T12:28:48Z (GMT). No. of bitstreams: 1 TES_CESAR_ROLANDO_NUNURA_NUNURA_COMPLETO.pdf: 7025675 bytes, checksum: fe9a9c1bc68c18e3f29d77b89573af7b (MD5) Previous issue date: 2016-03-31 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior - CAPES / His work considers the numerical simulation of the Jominy test, which evaluates the hardenability of steels, using as a solution the Finite Difference Method. Taking the initial and boundary conditions of the test and considering the heat transfer by conduction and forced convection, is solved numerically explicitly the differential equation that modeling the test, to obtain simulations of the thermal evolution or cooling curves at the specimen. Using the thermal profile obtained by the numerical solution is proposed a method for obtain the cooling rates and expressions that correlate hardness profile after the test [HRC = f (Cooling Rate)], and the numerical prediction of the final microstructures [Microstructure% = f (Cooling Rate)]. To validate the simulations were tested 02 steels: SAE 1060 and SAE 52100 according to ASTM A 255-07. These tests were instrumented with thermocouples for obtain the experimental thermal profile and compare with the simulated results. Hardness tests (HRC) were applied at the specimens for obtain the Jominy profile. Finally, analysis microscopy was applied to the specimens revealed the amounts of martensite, bainite, pearlite and ferrite present in the microstructure of the steel in function to the cooling rates. These microstructures validate the numerical results of [HRC = f (Cooling Rate)] and [% Microstructure = f (Cooling Rate)]. / Este trabalho prop?e a simulacao numerica do Ensaio Jominy, que avalia a temperabilidade dos a?os, usando como solu??o o M?todo das Diferen?as Finitas. Tomando as condi??es iniciais e de contorno do ensaio e considerando os mecanismos de transfer?ncia de calor de condu??o e convec??o for?ada, resolve-se numericamente de forma expl?cita a equa??o diferencial que modela o ensaio para realizar simula??es da evolu??o t?rmica ou curvas de resfriamento no corpo de prova. Utilizando o perfil t?rmico obtido pela solu??o num?rica prop?e-se um m?todo de c?lculo das taxas de resfriamento, para poder obter express?es que correlacionam perfil de dureza ap?s o ensaio [HRC = f(Taxas)], bem como a previs?o num?rica das microestruturas finais [%Microestrutura = f(Taxas)]. Para validar as simula??es foram ensaiados 02 a?os: SAE 1060 e SAE 52100 conforme a norma ASTM A 255-07. Estes ensaios foram instrumentados com termopares para obter um perfil t?rmico experimental para poder confrontar os resultados simulados. Ensaios de dureza HRC foram aplicados para obter a curva Jominy que avalia a profundidade de t?mpera nos a?os em quest?o. Finalmente, an?lises de microscopia aplicados nos corpos de prova revelaram as quantidades de martensita, bainita, perlita e ferrita presentes na microestrutura do a?o em fun??o das taxas de resfriamento. Estas microestruturas validam os resultados num?ricos de [HRC = f (Taxas)] e [%Microestrutura = f (Taxas)].