Instrumented Charpy : analysis of the instrumentation and the effect of different metallurgical conditions of an ultra-high strength steel on the dynamic fracture toughness / Charpy instrumentado : analise da instrumentação e da influencia de condições metalurgicas de um aço de ultra-alta resistencia mecanica na tenacidade a fratura dinamica

AUTOR(ES)
DATA DE PUBLICAÇÃO

2009

RESUMO

The classical Charpy test is used since 1900 and it is possible to determine from it the global energy for deformation and fracturing the specimen and this energy is named toughness which is important for selection steels considering ductile-brittle transition temperature. The Instrumented Charpy test is very important because it produces more material parameters, for example, the dynamic fracture toughness (KId), that can be used in Fracture Mechanics. However, there are several difficulties associated with the instrumentation of the impact machine ant processing digital signal, mainly in terms of the interpretation instrumented impact test results. The purpose of this work is to analyze the instrumentation system developed in accordance with normalization ISO 14556 (2000) to an Charpy machine and to determine and analyze the dynamic fracture toughness of the AISI 4340 steel in some metallurgical conditions obtained from treatment of quenching and tempering at 473K, 573K, 673K, and 773K. It was observed that the instrumentation system, the interpretation of the loads involved in the process of fracture and time to fracture are significant parameters in determining the dynamic fracture toughness.

ASSUNTO(S)

metais - propriedades mecanicas - testes de impacto metais - fratura mechanical properties of metals fracture of metals fracture mechanics mecanica da fratura

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