HRTEM Investigations on the Substructures of the Quenched Pearlite and Martensite

被引:1
作者
Zhu, Peng [1 ]
Yue, Jialong [1 ]
Zhou, Xinru [1 ]
Qiu, Yong [1 ]
Zhai, Kai [1 ]
Wu, Jianmeng [1 ]
Zhang, Yujing [1 ]
机构
[1] Zhengzhou Univ, Sch Chem Engn, Zhengzhou 450001, Peoples R China
关键词
ELECTRON-MICROSCOPY; OMEGA; CARBON; TRANSFORMATION; CEMENTITE; FERRITE; ALLOY; TRANSITION; AUSTENITE; ORIGIN;
D O I
10.1021/acs.cgd.4c00820
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
The substructures of pearlite and martensite in a water-quenched Fe-1.4C (wt %) binary alloy were investigated via optical microscopy, scanning electron microscopy and high-resolution transmission electron microscopy. In the carbide layers of the quenched pearlite lamellae, theta-Fe3C-type cementite particles and several novel carbides were observed. According to electron diffraction patterns, the crystal structure of twinned martensite could not be characterized as a body-centered tetragonal crystal structure, which is commonly assumed. Instead, the patterns suggested that the twinned martensite could be considered to have a body-centered cubic alpha-Fe {112}< 111 >-type twinning structure accompanied by a metastable omega-Fe phase (ultrafine particles) at the twinning boundaries. Furthermore, high-resolution lattice observations of twinned martensite substructures demonstrated that omega-Fe phase particles could exist independently in regions without twinning structures, indicating that they were not solely caused by overlap at twinning boundaries; thus, this prior assumption was challenged. The mechanism of the formation of new carbides in quenched pearlite and the presence of the omega-Fe phase in the regions without twinning could be reasonably explained by the autotempering or detwinning of the twinned martensite.
引用
收藏
页码:6819 / 6828
页数:10
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