NDLI: Thermomechanical Analysis of Deep Cryogenic Treatment of Navy C-Ring Specimen

Content Provider	Springer Nature Link
Author	Li, Junwan Feng, Yuan Zhang, Hongbo Min, Na Wu, Xiaochun
Copyright Year	2014
Abstract	A thermomechanical coupling numerical model is built to reproduce the deep cryogenic treatment (DCT) of a cold work die steel Cr8Mo2SiV (SDC99) Navy C-ring specimen and explore the transient temperature distribution and microstructure evolution in specimen. Furthermore, the predicted results are validated by x-ray diffraction analysis and hardness measurement. The results indicate that for both the quenching treatment (QT) and DCT, the differences in cooling rate and temperature distribution between the gap and core regions of specimen are significant. The gap region of specimen shows a more rapid cooling rate, while the core region of specimen presents a slower cooling rate. There is an underlying risk of hardening crack at the gap region of specimen during the cooling process. Both the cooling rate and the temperature difference that occurred in the DCT process are markedly smaller than that in the QT process. After QT, about 15.5% of austenite will still remain, especially in the edge and corner of specimen, which is a potential factor for component failure. Subjected to DCT, the microstructure distribution of specimen demonstrates a distinct change and finally the volume fraction of retained austenite decreases to about 2.3%, which principally localizes at the gap region of specimen. The hardness of specimen after DCT has been a dramatic increase and shows a uniform distribution. In comparison with the experimental data, the predicted results show a quite good accuracy. It indicates that the thermomechanical couple model employed in this study can be used to optimal control of the DCT process.
Starting Page	4237
Ending Page	4250
Page Count	14
File Format	PDF
ISSN	10599495
Journal	Journal of Materials Engineering and Performance
Volume Number	23
Issue Number	12
e-ISSN	15441024
Language	English
Publisher	Springer US
Publisher Date	2014-09-23
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	deep cryogenic treatment hardness numerical simulation phase transformation retained austenite Characterization and Evaluation of Materials Tribology, Corrosion and Coatings Quality Control, Reliability, Safety and Risk Engineering Design
Content Type	Text
Resource Type	Article
Subject	Mechanics of Materials Materials Science Mechanical Engineering

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