Microstructure characterization and strengthening behavior of dual precipitation particles in Cu-Ti microalloyed dual-phase steels

(چکیده مقاله) :
Abstract :

Copper particles that directly nucleated on the interphase precipitated TiC within the ferrite matrix were found in the CuTi bearing dual-Phase (DP) steel after a multistep heat treatment process. The formation of dual precipitates within ferrite grains should be considered a separated phase transformation process because only titanium carbides form initially when austenite undergoes decomposition reaction; subsequently, copper particles heterogeneously nucleate on these carbides.

The above separated precipitation behavior leads to a gentle tempering behavior of CuTi microalloyed DP steel. For example, in Cu microalloyed DP steel, the changes in the average Vickers hardness of ferrite and martensite after 9 h of tempering treatment were 165 to 210 and 407 to 278, respectively. However, in the CuTi microalloyed DP steel, the average Vickers hardness of ferrite and martensite increased from 235 to 249 and 339 to 353, respectively, after 9 h of tempering.

Fractography analysis revealed the mixed mode fracture characteristic due to the DP steel consisting of soft ferrite and hard martensite. However, fewer brittle-feature cleavage facets were found in the CuTi microalloyed DP steel after 5 h of tempering treatment, indicating the suppression of damage due to ferrite and martensite interface decohesion.

(توضیحات تکمیلی) :

(توضیحات تکمیلی) :
Description :

مقاله ISI انگلیسی اصلی
سال انتشار:2019
فایل ISI انگلیسی اصلی ، با فرمت Pdf
تعداد صفحات فایل ISI انگلیسی اصلی: 11 صفحه

Authors / Descriptions(نویسندگان/توضیحات): مقاله ISI سال انتشار2019 \ Cheng-Han Li a , Chih-Yuan Chen b, ⁎ , Shao-Pu Tsai a , Jer-Ren Yang a
Sent date(تاریخ ارسال) : 1398/01/25  |   4/14/2019
Number of visits(تعداد بازدید): 637
Key words (کلمات کلیدی): DP steel Hardness Interphase precipitation Dual precipitation Transmission electron microscopy
Number of pages(تعداد صفحات) : 11
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