NDLI: Effect of Austempering Route on Microstructural Characterization of Nanobainitic Steel

Content Provider	Springer Nature Link
Author	Du, Linxiu Liu, Xianghua Lan, Huifang Zhou, Na
Copyright Year	2014
Abstract	A low-temperature nanobainitic steel was obtained through one-step and two-step austempering. The effect of austempering temperature, time, and route on bainitic lath width, volume fraction of retained austenite, carbon concentration in retained austenite, and nanohardness of bainitic lath and retained austenite was studied. Results showed that the transformation kinetics was slowed down and the bainitic lath was refined as the austempering temperature decreased from 300 to 250 °C. Both coarser and finer bainitic laths were obtained with the two-step austempering, which was consistent with the lath size at 300 and 250 °C austempering, respectively. X-ray diffraction analysis showed that both volume fraction of retained austenite and its carbon concentration decreased with the decrease of austempering temperature for the one-step austempering, and especially the carbon concentration is obviously increased when the two-step austempering is adopted. The nanohardness of the bainitic lath in the sample after two-step austempering treated lies between that of the samples after 300 and 250 °C austempering treated. The product of tensile strength and total elongation of the two-step austempered sample is the highest, which increases monotonously with the product of retained austenite fraction and its carbon concentration. Higher strength–ductility balance may be resulted by the fine bainitic lath, high volume fraction, and high stability of retained austenite in the sample after two-step austempered.
Starting Page	19
Ending Page	26
Page Count	8
File Format	PDF
ISSN	10067191
Journal	Acta Metallurgica Sinica (English Letters)
Volume Number	27
Issue Number	1
e-ISSN	21941289
Language	English
Publisher	The Chinese Society for Metals
Publisher Date	2014-01-09
Publisher Place	Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Nanohardness Spectroscopy/Spectrometry Nanobainitic steel Retained austenite Stability Tribology, Corrosion and Coatings Organometallic Chemistry Strength–ductility balance Characterization and Evaluation of Materials Metallic Materials Nanotechnology
Content Type	Text
Resource Type	Article
Subject	Industrial and Manufacturing Engineering Metals and Alloys

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