Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 618, Issue -, Pages 219-231Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2014.09.021
Keywords
Modified 9Cr-1Mo steel; Tempered martensite; Effective grain size; Precipitates; Strength; Impact toughness
Categories
Funding
- Board of Research in Nuclear Sciences (BRNS), India
Ask authors/readers for more resources
A modified 9Cr-1Mo steel has been exposed to three separate normalization treatments i.e. at 950 degrees C, 1025 degrees C and 1100 degrees C from As-received (normalized at 1050 degrees C and tempered at 750 degrees C) condition. After subsequent tempering treatment the impact toughness in terms of upper shelf energy (USE) and ductile-to-brittle transition temperature (DBTT) has been evaluated using Charpy impact testing (with 10 mm x 10 mm x 55 mm specimens) following ASTM E23 procedures. A substantial improvement in USE (similar to 20 J) and reduction in DBTT (similar to 20 degrees C) has been noticed for the 1025 degrees C treatment. The result has been analysed in terms of change in yield strength and ductility evaluated with tensile tests. Further, effects of microstructure, precipitate and texture on the change of DBTT have been studied with TEM and EBSD analyses. The results have been attributed to the smaller 'effective grain size', higher fraction of high-angle boundaries, presence of beneficial gamma-fibre texture and dissolution of the pre-existing coarse precipitates in the reheated sample as compared to As-received material. (C) 2014 Elsevier B.V. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available