Effect of austempering time on microstructure and properties of a low-carbon bainite steel

被引：10
|
作者：
Liu, Man [1 ]
Xu, Guang [1 ]
Tian, Jun-yu [1 ]
Yuan, Qing [1 ]
Chen, Xin [1 ]
机构：
[1] Wuhan Univ Sci & Technol, State Key Lab Refractories & Met, Wuhan 430081, Peoples R China
来源：
INTERNATIONAL JOURNAL OF MINERALS METALLURGY AND MATERIALS | 2020年 / 27卷 / 03期
基金：
中国国家自然科学基金;
关键词：
austempering time; retained austenite; martensite; austenite island; low-carbon bainite; transformation kinetics; ATOM-PROBE ANALYSIS; MECHANICAL-PROPERTIES; AUSFORMING TEMPERATURE; SILICON CONTENT; TRANSFORMATION; STRENGTH; AUSTENITE; DEFORMATION; TOUGHNESS;
D O I：
10.1007/s12613-019-1881-y
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The effect of austempering time after the bainitic transformation on the microstructure and property in a low-carbon bainite steel was investigated by metallography and dilatometry. The results showed that by prolonging the austempering time after the bainite transformation, the amount of large-size martensite/austenite islands decreased, but no significant change of the amount and morphology of bainite were observed. In addition, more austenite with a high carbon content was retained by prolonging the holding time at the bainite transformation temperature. Moreover, with a longer holding time, the elongation was improved at the expense of a small decrease in tensile strength. Finally, the Avrami equation B-RF = 1- exp(-0.0499 x t(0.7616)) for bainite reaction at 350 degrees C was obtained for the tested steel. The work provided a reference for tailoring the properties of low-carbon steels.
引用
收藏
页码：340 / 346
页数：7
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