کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1642291 1517229 2015 4 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Dislocation motion in a NI-Fe-based superalloy during creep–rupture beyond 700 °C
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد فناوری نانو (نانو تکنولوژی)
پیش نمایش صفحه اول مقاله
Dislocation motion in a NI-Fe-based superalloy during creep–rupture beyond 700 °C
چکیده انگلیسی


• A new low cost Ni-Fe-base alloy is a promising advanced ultra-supercritical material.
• Dislocation configurations during creep rupture are carefully identified.
• Creep rupture deformation mechanisms are presented.

A Ni–Fe based superalloys with excellent high temperature mechanical properties and low cost have been evaluated as the promising candidate materials for advanced ultra-supercritical coal-fired power plants. The major concerns with the Ni-Fe-based alloys are the insufficient fundamental deformation mechanisms at intermediate temperatures. In this study, dislocation-based deformation mechanisms were identified carefully in creep ruptured specimens beyond 700 °C. The motion of dislocations allows plastic deformation to occur. Two types of dislocation configurations mainly occurred during the creep rupture tests beyond 700 °C. Below 750 °C, Orowan looping are more likely occur and considered as the predominant deformation mechanism. Above 750 °C, the predominant model of deformation mechanism becomes γ′ precipitates shearing. Detailed identification of dislocation configurations were performed in the creep rupture specimens in order to correlate the macroscopic behavior with the creep controlling mechanisms.

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ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Letters - Volume 159, 15 November 2015, Pages 241–244
نویسندگان
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