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Metals 2017, 7(7), 238; doi:10.3390/met7070238

Morphology and Crystallography of Ausferrite in Austempered Ductile Iron

1
School of Material Science and Engineering, Zhengzhou University, 100 Science Avenue, Zhengzhou 450001, China
2
School of Chemical Engineering and Energy, Zhengzhou University, 100 Science Avenue, Zhengzhou 450001, China
*
Author to whom correspondence should be addressed.
Received: 27 May 2017 / Revised: 18 June 2017 / Accepted: 26 June 2017 / Published: 29 June 2017
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Abstract

The microstructure of austempered ductile iron was investigated by electron backscatter diffraction technique. The results show that the orientation relationship between acicular bainitic ferrite and austenite is Greninger–Troiano relationship. A single austenite grain is divided into four packets and each packet contains six variants that share a {011}α (i.e., {111}γ) plane. When two γ grains are twinned, the twins share a {111}γ plane and have seven packets. The adjacent acicular bainitic ferrite plates (or laths) sharing a 001 γ axis have small misorientation of about 5.7°. The adjacent acicular bainitic ferrite plates (or laths) not sharing a 001 γ axis have two high misorientation angles of ~54.3° and ~60.0°. Further, the low angle boundary to high angle boundary ratio is far less than the ratio of the variant pairs with small misorientation to the ones with large misorientation. This work is available for structures obtained as a consequence of the heat treatment of austempering. View Full-Text
Keywords: electron backscatter diffraction; morphology; crystallography; acicular bainitic ferrite; austempered ductile iron electron backscatter diffraction; morphology; crystallography; acicular bainitic ferrite; austempered ductile iron
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Wang, C.; Du, X.; Li, S.; Sun, Y.; Yang, P. Morphology and Crystallography of Ausferrite in Austempered Ductile Iron. Metals 2017, 7, 238.

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