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

页码：340 / 346

页数：7

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