کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1575621 1514751 2014 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
The formation and dissolution of residual δ ferrite in ASME Grade 91 steel plates
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد دانش مواد (عمومی)
پیش نمایش صفحه اول مقاله
The formation and dissolution of residual δ ferrite in ASME Grade 91 steel plates
چکیده انگلیسی
This paper investigated the relationship between creep strength and the existence of residual δ ferrite in the initial microstructure in three heats of Grade 91 steel plates and examined the origin, the transformation process and the dissolution of the δ ferrite in the steel plates. The creep strength of the steel specimens was lower when the δ ferrite was present in the initial microstructure. The δ ferrite showed a disk shape and a bumpy interface, and had MX carbonitride particle arrays inside and coarse M23C6 carbide particles on the bumpy interface. Chromium and molybdenum were found to segregate in/around the δ ferrite disk. The residual δ ferrite dissolved completely after an additional normalizing heat treatment at 1050 °C for 30 min. The results obtained strongly indicate that the presence of δ ferrite is due to insufficient normalizing heat treatment time to remove segregation during solidification. The δ ferrite was also found to grow through a diffusional transformation during cooling from the normalizing heat treatment.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Science and Engineering: A - Volume 592, 13 January 2014, Pages 241-248
نویسندگان
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