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| Effect of Heating Rate Before Tempering on Reversed Austenite in Fe-9Ni-C Alloy |
| ZHANG Kun,TANG Di,WU Hui-bin |
| National Engineering Research Center of Advanced Rolling, University of Science and Technology Beijing, Beijing 100083, China |
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Abstract The alloy was reheated to 580 �� for tempering at rates of 2, 5, 10, 20, and 40 ��/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 ��/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 ��/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.
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Received: 18 July 2011
Published: 26 September 2012
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Corresponding Authors:
Kun ZHANG
E-mail: siekom219@126.com
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2012, Vol. 19 
