Study on Austenitization Kinetics of SA508 Gr.3 Steel Based on Isoconversional Method

Metals

Xiaomeng Luo²  Lizhan Han²  Jianfeng Gu¹ 

[1] Institute of Materials Modification and Modeling, School of Material Science and Engineering, Shanghai Jiaotong University, 800 Dongchuan Road, Shanghai 200240, China

关键词: isoconversional method;    austenitization kinetics;    SA508 Gr.3 steel;    dilatometry;    time-temperature-austenitization (TTA) diagram;   

DOI  :  10.3390/met6010008

来源: mdpi

【 摘 要 】

The austenitization kinetics of SA508 Gr.3 steel during heating was studied using the isoconversional method combined with continuous thermal dilatometric tests for the first time. The model-free austenitization kinetics was built and the effective activation energy as a function of transformed austenite fraction was determined without transformation models. Then, the corresponding regression validation was carried out. The time-temperature-austenitization (TTA) diagram of SA508 Gr.3 steel, which is very difficult to be obtained using experiment measures, was constructed. Finally, the austenitization kinetics in a more realistic case, i.e., under non-constant heating rates, was predicted, which is found to agree well with the experimental results.

【 授权许可】

CC BY   
© 2015 by the authors; licensee MDPI, Basel, Switzerland.