Effect of Heating Rate Before Tempering on Reversed Austenite in Fe-9Ni-C Alloy

被引：10

作者：

Zhang Kun ^{[1
]}

Tang Di ^{[1
]}

Wu Hui-bin ^{[1
]}

机构：

[1] Univ Sci & Technol Beijing, Natl Engn Res Ctr Adv Rolling, Beijing 100083, Peoples R China

来源：

JOURNAL OF IRON AND STEEL RESEARCH INTERNATIONAL | 2012年 / 19卷 / 09期

关键词：

9Ni steel; heating rate; reversed austenite; cryogenic toughness; RETAINED AUSTENITE; PRECIPITATED AUSTENITE; MECHANICAL-PROPERTIES; 9NI STEEL; TRIP STEELS; TRANSFORMATION; CARBON; TEMPERATURE; MARTENSITE; STABILITY;

D O I：

10.1016/S1006-706X(13)60011-4

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

The alloy was reheated to 580 degrees C for tempering at rates of 2, 5, 10, 20, and 40 degrees C/s, respectively, after quenching. The amount, distribution, and stability of reversed austenite were investigated by X-ray diffraction (XRD) and electron back scatter diffraction (EBSD). The microstructure and cryogenic impact energy were studied by scanning electron microscope (SEM), transmission electron microscope (TEM) and Charpy V-notch (CVN) tests. The results showed that when the sample was heated at 10 degrees C/s, the volume fraction of reversed austenite exhibited maximum of 8%; the reversed austenite was uniform along all kinds of boundaries; the reversed austenite contained higher concentration of carbon which enabled it to be more stable. The cryogenic toughness of the alloy was greatly improved when heated at 10 degrees C/s, as the fracture surface observation showed that it mainly fractured in ductile rupture mode, which was consistent with the results of cryogenic impact energy.

引用

页码：73 / 78

页数：6

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