NDLI: Hot Ductility Characterization of Sanicro-28 Super-Austenitic Stainless Steel

Content Provider	Springer Nature Link
Author	Mirzaei, A. Zarei Hanzaki, A. Abedi, H. R.
Copyright Year	2016
Abstract	The hot ductility behavior of a super-austenitic stainless steel has been studied using tensile testing method in the temperature range from 1073 K to 1373 K (800 °C to 1100 °C) under the strain rates of 0.1, 0.01, and 0.001 s$^{−1}$. The hot compression tests were also performed at the same deformation condition to identify the activated restoration mechanisms. At lower temperatures [i.e., 1073 K and 1173 K (800 °C and 900 °C)], the serration of initial grain boundaries confirms the occurrence of dynamic recovery as the predominant restoration process. However, in the course of applied deformation, the initial microstructure is recrystallized at higher temperatures [i.e., 1273 K and 1373 K (1000 °C and 1100 °C)]. In this respect, annealing the twin boundaries could well stimulate the recrystallization kinetic through initiation new annealing twins on prior annealing twin boundaries. The hot tensile results show that there is a general trend of increasing ductility by temperature. However, two regions of ductility drop are recognized at 1273 K and 1373 K (1000°C)/0.1s$^{−1}$ and (1100°C)/0.01s$^{−1}$. The ductility variations at different conditions of temperature and strain rate are discussed in terms of simultaneous activation of grain boundary sliding and restoration processes. The observed ductility troughs are attributed to the occurrence of grain boundary sliding and the resulting R-type and W-type cracks. The occurrence of dynamic recrystallization is also considered as the main factor increasing the ductility at higher temperatures. The enhanced ductility is primarily originated from the post-uniform elongation behavior, which is directly associated with the strain rate sensitivity of the experimental material.
Starting Page	2037
Ending Page	2048
Page Count	12
File Format	PDF
ISSN	10735623
Journal	Metallurgical and Materials Transactions A
Volume Number	47
Issue Number	5
e-ISSN	15431940
Language	English
Publisher	Springer US
Publisher Date	2016-02-04
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Metallic Materials Characterization and Evaluation of Materials Structural Materials Surfaces and Interfaces, Thin Films Nanotechnology
Content Type	Text
Resource Type	Article
Subject	Mechanics of Materials Metals and Alloys Condensed Matter Physics

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