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مقالات فارسیISIکنفرانسهاژورنالها

A Study on the Nanoscale Austenite Stabilized by Q&P Heat Treatment in a Low-alloy Medium-carbon Steel

محل انتشار: مجله علم مواد و مهندسی ایران، دوره: 15، شماره: 3
سال انتشار: 1397
نوع سند: مقاله ژورنالی
زبان: انگلیسی
مشاهده: 116

فایل این مقاله در 11 صفحه با فرمت PDF قابل دریافت می باشد

استخراج به نرم افزارهای پژوهشی:

لینک ثابت به این مقاله:
https://civilica.com/doc/1606532

شناسه ملی سند علمی:

JR_IJMSEI-15-3_001

تاریخ نمایه سازی: 1 اسفند 1401

چکیده مقاله:

In this research, the objective was to investigate the stabilized retained austenite in the microstructure resulting from the Q&P heat treatment since the primary goal in Q&P is to create a microstructure consists of stabilized retained austenite and martensite. For this purpose, a low-alloy steel with ۰.۴wt. % carbon was treated by quench and partitioning (Q&P) process. The Q&P was conducted at different quench temperatures to obtain a considerable amount of retained austenite, while partitioning temperature and time were kept constant. Through analysis of the XRD profiles, volume percent, carbon concentration, and lattice parameters of retained austenite and martensite were calculated. At quench temperature equal to ۱۶۰°C, ۱۲vol.% austenite was stabilized to the room temperature, which was the highest amount achieved. The microstructural observations carried out on selected samples, revealed that retained austenite has a nanoscale particle size, about ۲۰۰nm. Distinguishing retained austenite in the SEM micrographs became possible by utilizing SE۲ signals via the difference in phases contrast. Two types of morphology, film-like and blocky type, were identified by means of TEM and TKD and a schematic model was proposed in order to explain these morphologies

کلیدواژه ها:

Quench and Partitioning ، Retained austenite ، nanoscale film-like RA ، low alloy steel

نویسندگان

R. Jafari

School of Metallurgy & Materials Engineering, Iran University of Science and Technology

Sh. Mirdamadi

School of Metallurgy & Materials Engineering, Iran University of Science and Technology

Sh. Kheirandish

School of Metallurgy & Materials Engineering, Iran University of Science and Technology

H. Guim

Daejeon, Republic of Korea

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