The influence of microstructure and carbide particles on the creep behaviors of P/M alloys

Albert Eliot Segall, T. Cimino, T. Murphy, T. Haberberger, Barbara Shaw

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Microstructure, related porosity, and the presence of strengthening inclusions such as carbides are known to influence the strength behaviors of PM alloys. Since an understanding of these relationships will be required if PM alloys are to be successfully used in demanding automotive applications, studies were conducted to evaluate their influence on design properties such as creep. Elevated tensile creep tests at 677°C (1250°F) and 35Mpa (5Ksi) were conducted to determine steady state creep rates and deformations of 434L and 304L alloys. While both materials exhibited acceptable behaviors for automotive applications, relatively large differences between creep rupture times were observed. Moreover, a large variance in the creep rupture time was observed for the 304L alloy. It is believed that the observed variations in creep behaviors between the 434L and 304L alloys can be attributed to porosity variations, the existence of a silicon oxide layer along the grain boundaries of the 304L samples, and the presence of chromium carbide within the 434L specimens.

Original languageEnglish (US)
Pages (from-to)1973-1981
Number of pages9
JournalAdvances in Powder Metallurgy and Particulate Materials
StatePublished - 2001

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Carbides
Creep
Microstructure
Porosity
Silicon oxides
Chromium
Grain boundaries

All Science Journal Classification (ASJC) codes

  • Mechanical Engineering
  • Metals and Alloys

Cite this

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abstract = "Microstructure, related porosity, and the presence of strengthening inclusions such as carbides are known to influence the strength behaviors of PM alloys. Since an understanding of these relationships will be required if PM alloys are to be successfully used in demanding automotive applications, studies were conducted to evaluate their influence on design properties such as creep. Elevated tensile creep tests at 677°C (1250°F) and 35Mpa (5Ksi) were conducted to determine steady state creep rates and deformations of 434L and 304L alloys. While both materials exhibited acceptable behaviors for automotive applications, relatively large differences between creep rupture times were observed. Moreover, a large variance in the creep rupture time was observed for the 304L alloy. It is believed that the observed variations in creep behaviors between the 434L and 304L alloys can be attributed to porosity variations, the existence of a silicon oxide layer along the grain boundaries of the 304L samples, and the presence of chromium carbide within the 434L specimens.",
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The influence of microstructure and carbide particles on the creep behaviors of P/M alloys. / Segall, Albert Eliot; Cimino, T.; Murphy, T.; Haberberger, T.; Shaw, Barbara.

In: Advances in Powder Metallurgy and Particulate Materials, 2001, p. 1973-1981.

Research output: Contribution to journalArticle

TY - JOUR

T1 - The influence of microstructure and carbide particles on the creep behaviors of P/M alloys

AU - Segall, Albert Eliot

AU - Cimino, T.

AU - Murphy, T.

AU - Haberberger, T.

AU - Shaw, Barbara

PY - 2001

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AB - Microstructure, related porosity, and the presence of strengthening inclusions such as carbides are known to influence the strength behaviors of PM alloys. Since an understanding of these relationships will be required if PM alloys are to be successfully used in demanding automotive applications, studies were conducted to evaluate their influence on design properties such as creep. Elevated tensile creep tests at 677°C (1250°F) and 35Mpa (5Ksi) were conducted to determine steady state creep rates and deformations of 434L and 304L alloys. While both materials exhibited acceptable behaviors for automotive applications, relatively large differences between creep rupture times were observed. Moreover, a large variance in the creep rupture time was observed for the 304L alloy. It is believed that the observed variations in creep behaviors between the 434L and 304L alloys can be attributed to porosity variations, the existence of a silicon oxide layer along the grain boundaries of the 304L samples, and the presence of chromium carbide within the 434L specimens.

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