The purpose of this work is to study the effect of heat treatments on the microstructure of the nickel-based superalloy Inconel 713C. Three different conditions were studied and the results compared: (1) as cast; (2) solid solution treatment (1179 °C/2 h) and (3) stabilization heat treatment (1179 °C/2 h plus 926 °C/16 h). Inconel 713C is normally used in the as-cast condition, an improvement in the 980 °C stress-rupture life is often obtained by a solution heat treatment. However, the material in this condition tested under high stress at 730 °C shows a marked decreased in rupture life and ductility. The mechanical resistance in creep increases in Inconel 713C by precipitation hardening phase, with γ’ (Ni3Al) formed during the heat treatments. The characterization techniques used were: chemical analysis, hardness testing, X-ray diffraction, optical microscopy and scanning electron microscopy (SEM), EDS analyzes and thermocalculation. The SEM and EDS analysis illustrated the γ, γ’ and carbides. The matrix phase (γ), has in its constitution the precipitation of the γ’ phase, in a cubic form, and in some regions, carbides were modified through the heat treatments. (M23C6-type) and boride (M3B2 type) identified with the use of the thermocalculation. The heat treatments increase the relative intensity of niobium in the carbides. The hardness test was not achieved because the material was overaged.
The purpose of this work is to study the effect of heat treatments on the microstructure of the nickel-based superalloy Inconel 713C. Three different conditions were studied and the results compared: (1) as cast; (2) solution treatment (1,179°C/2h) and (3) stabilizing treatment (1,179°C/2h plus 926°C/16h). Inconel 713C is normally used in the as-cast condition, an improvement in the 980°C stress-rupture life is often obtained by a solution heat treatment. However, the material in this condition tested under high stress at 730°C shows a marked decreased in rupture life and ductility [1]. The mechanical resistance in creep increases in Inconel 713C by precipitation hardening phase, such γ’ (Ni3Al) formed during the heat treatments [2]. The characterization techniques used was: chemical analysis, hardness test, X-ray diffraction, optical microscope and scanning electron microscopy (SEM), EDS analyzes and thermocalculation. The heat treatments modified the dendritic structure, reducing the acicularity. The SEM and EDS analysis illustrated the γ, γ’ and carbides. The matrix phase (γ), has in its constitution the precipitation of the γ’ phase, in a cubic form, and in some regions, veins of carbides were modified with the heat treatments.
Resumo O objetivo deste trabalho é estudar o efeito dos tratamentos térmicos de solubilização e envelhecimento na microestrutura da superliga Inconel 713C. Três diferentes condições de tratamento foram estudadas e os resultados comparados: (1) bruto fusão; (2) solubilizado (1179°C/2h) e (3) envelhecido (1179°C/2h + 926°C/16h). Inconel 713C é normalmente utilizado na condição bruta de fusão, uma melhora em sua vida em fluência a 980°C é geralmente obtida com a solubilização da liga, entretanto, o material nesta condição solicitado a elevadas tensões, apresenta uma acentuada redução de ductilidade e vida em fluência. A resistência à fluência aumenta na liga Inconel 713C com a precipitação da fase endurecedora γ' (Ni 3 Al), formada durante os tratamentos térmicos. As técnicas de caracterização utilizadas foram: análise química, difração de raios X e microscopia óptica e eletrônica de varredura (MEV) e espectroscopia de raios X por dispersão de energia (EDS). Os tratamentos térmicos modificam a estrutura dendrítica presente na condição bruta de fusão, reduzindo a acicularidade da mesma. As imagens MEV e análises EDS ilustram a presença das fases γ, γ' e carbetos, formando a microestrutura da liga. A fase matricial (γ) tem em sua constituição a precipitação da fase γ' na forma cúbica e em algumas regiões veios de carbetos que são modificados com os posteriores tratamentos térmicos. Palavras-chave:Tratamento térmico; Inconel 713C; Microestrutura.
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