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Metals and Materials : Volume 7, Issue 1, February 2001

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Interpretation of the strengthening of steel with lower bainite and martensite mixed microstructure

Content Provider	Springer Nature Link
Author	Park, Kyung Tae Kwon, Hyuk Joo
Copyright Year	2001
Abstract	A mixed microstructure consisting of lower bainite and martensite was introduced in an alloyed medium carbon steel (SCM 435) through an appropriate isothermal treatment and the variation in microhardness was measured as a function of lower bainite fraction. It was shown that a maximum hardness peak appeared when the steel contained about 20% lower bainite. A double etching technique using picric acid to reveal the prior austenite grain and Le Pera etchant to reveal the lower bainite phase showed that the microstructure became manifest through the partition of the prior austenite grain by the lower bainite plates. Based on such microstructural characteristics, a model interpreting the strengthening of the steel through the presence of lower bainite was constructed and shown to be well-fitted with the experimental results. The model took into consideration of three factors: the refinement of the martensitic substructure through the presence of lower bainite, the carbon shifting from bainitic ferrite into untransformed austenite during lower bainite transformation and the mixture rule.
Starting Page	95
Ending Page	99
Page Count	5
File Format	PDF
ISSN	15989623
Journal	Metals and Materials
Volume Number	7
Issue Number	2
Language	English
Publisher	The Korean Institute of Metals and Materials
Publisher Date	2001-01-01
Publisher Place	Seoul
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	medium carbon steel strengthening lower bainite martensite Metallic Materials Operating Procedures, Materials Treatment Magnetism, Magnetic Materials Engineering Thermodynamics, Heat and Mass Transfer Characterization and Evaluation of Materials Continuum Mechanics and Mechanics of Materials
Content Type	Text
Resource Type	Article
Subject	Materials Chemistry Mechanics of Materials Metals and Alloys Condensed Matter Physics

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