کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1582092 1514869 2008 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Phase changes of the AISI 430 ferritic stainless steels after high-temperature gas nitriding and tempering heat treatment
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد دانش مواد (عمومی)
پیش نمایش صفحه اول مقاله
Phase changes of the AISI 430 ferritic stainless steels after high-temperature gas nitriding and tempering heat treatment
چکیده انگلیسی
This study examined the phase changes, nitride precipitation, heat treatment, hardness variations and tempering effect of AISI 430 ferritic stainless steel after high-temperature gas nitriding (HTGN) at 1050 °C and 1100 °C in a nitrogen gas atmosphere. The strong affinity between nitrogen and Cr enabled the permeation of nitrogen into AISI 430 ferritic stainless steel. The surface layer of the steel was changed into martensite + ferrite and Cr2N at 1050 °C, while martensite plus a rectangular type retained austenite were observed at 1100 °C after HTGN. When the nitrogen-alloyed AISI 430 steel was tempered, the precipitation of (CrFe)N nitride and a secondary hardening effect resulted in an increase in hardness to a maximum value at 450 °C. Above 450 °C, nitride precipitation decreased the hardness considerably. The HTGN treatment improved the corrosion resistance, while the precipitation of high density of Cr2N deteriorated the corrosion resistance.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Science and Engineering: A - Volume 489, Issues 1–2, 20 August 2008, Pages 38-43
نویسندگان
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