Effect of microstructural features on ductility in hypo-eutectoid steels
- POSCO Technical Research Lab., Pohang (Korea, Republic of)
- Pohang Univ. of Science and Technology (Korea, Republic of). Center for Advanced Aerospace Materials
The increment of the total amount of deformation through improving the drawability has an advantage of eliminating the lead patenting heat treatment as well as obtaining the high strength level in the steel wire industry. While the relationship between the strength and microstructure in hypo-eutectoid steels has been widely investigated, the factors governing ductility, which control the total amount of deformation in the wire drawing process, are less understood. Previous investigations have reported that the volume fraction of pro-eutectoid ferrite can be reduced by a control of transformation kinetics factors such as transformation temperatures, carbon contents and austenitizing temperatures, resulting in a nearly fully pearlitic microstructure, i.e., the pearlite without pro-eutectoid ferrite (less than 2%). Accordingly, the deficiency of carbon contents in the pearlite region induces the formation of degenerate pearlite, i.e. non-lamellar pearlite. However, the effects of microstructural features (the pro-eutectoid ferrite content, austenite grain size (AGS) and interlamellar spacing in degenerate pearlite) on ductility in hypo-eutectoid steels have not been clarified yet. Accordingly, in the present work, it is attempted to investigate the effects of austenitizing temperature and of transformation temperature on microstructural features and also on ductility in 0.52%C steel. The results are compared with those of 0.82%C eutectoid steel.
- OSTI ID:
- 691317
- Journal Information:
- Scripta Materialia, Vol. 41, Issue 6; Other Information: PBD: 20 Aug 1999
- Country of Publication:
- United States
- Language:
- English
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