کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1678898 1009975 2007 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Three-dimensional atom probe characterization of alloy element partitioning in cementite during tempering of alloy steel
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد فناوری نانو (نانو تکنولوژی)
پیش نمایش صفحه اول مقاله
Three-dimensional atom probe characterization of alloy element partitioning in cementite during tempering of alloy steel
چکیده انگلیسی

Hardness measurements confirm that the martensitic microstructure of an alloy steel, AISI/SAE 4340, is significantly more resistant to softening, compared to the martensitic microstructure of a high-purity Fe–0.4% C alloy, at tempering temperatures, 300–400 °C, just above the temperatures where cementite replaces transition carbides in the martensitic matrix. Three-dimensional atom probe (3DAP) analyses of the 4340 steel show that Si rejection from the cementite is first detected after low-temperature tempering for times of 1 h. After 10-h tempering at 400 °C, Mn and Cr contents are increased, and Ni contents decreased, in cementite according to their carbide- and non-carbide-forming tendencies, respectively. The results are discussed with respect to the diffusivity of the substitutional alloying elements in the 4340 steel, and the effect that such diffusion-controlled redistribution would have on maintaining fine distributions of cementite that resist softening during tempering.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Ultramicroscopy - Volume 107, Issue 9, September 2007, Pages 808–812
نویسندگان
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