کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7969184 | 1514348 | 2018 | 11 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Effects of W on creep behaviors of novel Nb-bearing high nitrogen austenitic heat-resistant cast steels at 1000â¯Â°C
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
دانش مواد (عمومی)
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Effects of W on creep behaviors of novel Nb-bearing high nitrogen austenitic heat-resistant cast steels at 1000â¯Â°C Effects of W on creep behaviors of novel Nb-bearing high nitrogen austenitic heat-resistant cast steels at 1000â¯Â°C](/preview/png/7969184.png)
چکیده انگلیسی
Recently, there is an urgent demand from automotive industries to develop new austenitic heat-resistant cast steels that withstand exhaust gas temperatures as high as 1000â¯Â°C. In this study, the effect of W additions on the creep behavior of a series of Nb-bearing high nitrogen austenitic heat-resistant cast steels was investigated at 1000â¯Â°C and 50â¯MPa. Microstructures before and after creep rupture tests were carefully characterized to illustrate the microstructural evolution during creep deformation. Microstructural analyses revealed that the W addition did not affect the formation of primary Nb(C,N), whereas significantly promoted the precipitation of primary (Cr, W)-rich phases, particularly those cellular structures along grain boundaries. The W solid solution strengthening and the secondary precipitation strengthening of submicron-scale (Cr, W)-rich phase improved the creep resistance of the alloys through increasing the hardness of γ-austenite and pinning the dislocations. However, the primary cellular (Cr, W)-rich structures significantly accelerated the nucleation and propagation of creep cracks along grain boundaries, thereby increasing the creep rate and decreasing the creep life.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Characterization - Volume 139, May 2018, Pages 19-29
Journal: Materials Characterization - Volume 139, May 2018, Pages 19-29
نویسندگان
Yinhui Zhang, Mei Li, Larry A. Godlewski, Jacob W. Zindel, Qiang Feng,