Nanosized Lamellar Structures and Tensile Properties of Intercritical‐Annealed Medium Mn Steels Containing Multiphases
SCIE
SCOPUS
- Title
- Nanosized Lamellar Structures and Tensile Properties of Intercritical‐Annealed Medium Mn Steels Containing Multiphases
- Authors
- Trang, Thi Thanh Tram; Jeong, Chang-Gon; Lee, Dongwon; Heo, Yoon-Uk
- Date Issued
- 2023-02
- Publisher
- Verlag Stahleisen GmbH
- Abstract
- The effect of extended intercritical annealing time on the changes of the microstructure and tensile properties is studied in a medium Mn steel. Nanosized lamellar structures are formed after intercritical annealing at 550 degrees C for 8 and 16 h; they consist of mainly tempered-alpha ' martensite with retained austenite. Many cementite precipitates are observed in the tempered-alpha ' martensite matrix and at the high-angle boundaries. The orientation relationship between theta-cementite and tempered-alpha ' martensite is identified to be (01 over bar 1)(theta)//(21 over bar 1)(tempered-alpha '), [011](theta)//[011](tempered-alpha '), and [100](theta)//[111 over bar ](tempered-alpha '). Fresh alpha ' martensite is detected between the tempered-alpha ' martensite and austenite lamellae in the quenched specimens. The fresh alpha ' martensite is formed due to partial martensitic transformation of austenite upon cooling. The fractions of cementite and fresh alpha ' martensite increase with extended annealing time, leading to reduced austenite fraction after quenching. Additional baking treatment at 200 degrees C increases yield stress and elongation due to the stabilization of the austenite. This study provides a detailed understanding of these complex nanosized microstructures and discusses the key factors governing their yield stresses and work hardening behaviors.
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/114997
- DOI
- 10.1002/srin.202200233
- ISSN
- 1611-3683
- Article Type
- Article
- Citation
- Steel Research International, page. 2200233, 2023-02
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- There are no files associated with this item.
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