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Novel Concept of TWIP-Assisted Steel

Title
Novel Concept of TWIP-Assisted Steel
Authors
강지현
Date Issued
2010
Publisher
포항공과대학교
Abstract
TWIP steels are known for their high strength with elongation but have manufacturing and cost disadvantages due to their high manganese content. The novel concept of TWIP-assisted steels has been introduced in analogy with TRIP-assisted steels. The aim was to produce local regions of austenite which contains manganese high enough to exhibit localized TWIP during the deformation. To achieve the aim, the cementite particles in ferrite matrix were formed by tempering in the ferrite+cementite field. The cementite would enrich with Mn after appropriate time. Then, this enriched cementite was supposed to transform into austenite by isothermal heat treatment. The austenite would inherit the high manganese content and be retained on cooling. The final microstructure would contain Mn-rich austenite islands in ferrite matrix. Three alloys were designed using thermodynamic calculation considering the volume fraction and Mn content of cementite. The appropriate time to enrich cementite was decided using thermodynamic calculation with a finite difference kinetic model. A series of heat treatment and microstructural and microanalytical characterization were done. The most important result was that austenite which formed at ferrite/cementite interface grew by consuming both ferrite and cementite simultaneously. Even though cementite bears high manganese, growth into ferrite resulted in dilution of Mn. The tensile testing was attempted but the samples were so large that they showed low heating rate. They resulted in different microstructure from the ones produced by dilatometry, thus, exhibiting disappointing tensile properties.
URI
http://postech.dcollection.net/jsp/common/DcLoOrgPer.jsp?sItemId=000000564241
http://oasis.postech.ac.kr/handle/2014.oak/712
Article Type
Thesis
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