کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6744088 | 1429328 | 2017 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Effects of cooling rates on δ-ferrite/γ-austenite formation and martensitic transformation in modified ferritic heat resistant steel
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی انرژی
مهندسی انرژی و فناوری های برق
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Aimed at clarifying δ-ferrite formation in fusion welding of ferritic/martensitic steels, effects of cooling rates on δ/γ transformation and martensitic transformation in modified ferritic heat resistant steel are investigated by high-speed quenching dilatometer equipment and microstructure examination. In heating stage, γ-austenite starts to transform into δ-ferrite at 1250 ± 20 °C. With respect to cooling stage, at cooling rate of 1 °C/s, γ â δ transformation takes place at temperatures above 1250 °C. Stripe-shaped δ-ferrite is produced at 1 °C/s, and under higher cooling rates (30, 50 and 200 °C/s), δ-ferrite exhibits block morphology. The different levels to which the δ â γ transformation proceeds would result in the variation in austenite grain size and the amount of δ-ferrite, affecting the subsequent martensitic formation. Effects of cooling rates on martensite start temperature have been discussed in terms of austenite grain size and austenite chemical stability.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Fusion Engineering and Design - Volume 125, December 2017, Pages 354-360
Journal: Fusion Engineering and Design - Volume 125, December 2017, Pages 354-360
نویسندگان
Xiaosheng Zhou, Yongchang Liu, Zhixia Qiao, Qianying Guo, Chenxi Liu, Liming Yu, Huijun Li,