Discontinuous lath martensite transformation and its relationship with annealing twin of parent austenite and cooling rate in low carbon RAFM steel
Lath martensite transformation in low carbon steel relates to the discontinuity of the transformation rate, which exhibits a series of martensite transformation rate maxima (peaks), especially in low cooling rates. In the present work, we put an emphasis on the influence of annealing twins in parent...
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| Language: | English |
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Elsevier
2021-01-01
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| Series: | Materials & Design |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S0264127520307875 |
| _version_ | 1818930001876090880 |
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| author | Chunliang Mao Chenxi Liu Liming Yu Huijun Li Yongchang Liu |
| author_facet | Chunliang Mao Chenxi Liu Liming Yu Huijun Li Yongchang Liu |
| author_sort | Chunliang Mao |
| collection | DOAJ |
| description | Lath martensite transformation in low carbon steel relates to the discontinuity of the transformation rate, which exhibits a series of martensite transformation rate maxima (peaks), especially in low cooling rates. In the present work, we put an emphasis on the influence of annealing twins in parent austenite grains (PAGs) and cooling rates on the discontinuity of lath martensite transformation rate in a low carbon reduced activation ferritic/martensitic (RAFM) steel. Lath martensite microstructure is hierarchical and the lath martensite transformation rate peaks are hierarchical during the cooling process. If the cooling rate was not high enough, the lath martensite transformation rate peaks will be divided into two groups by annealing twins in parent austenite. These transformation rate peaks in the first group were mainly caused by lath martensite transformation in the non–twin zones in the PAGs. Then, the second group mainly consisted of a single transformation rate peak, which was primarily caused by the martensite transformation in the twin zones in the PAGs. In the present work, a new “localized stress field” theory is proposed and successfully used for interpreting the classification mechanism of lath martensite transformation rate peaks and the evolution of these peaks with changing cooling rate. |
| first_indexed | 2024-12-20T03:53:46Z |
| format | Article |
| id | doaj.art-b7124be0fa994cb8b2ae3582e7d2ce41 |
| institution | Directory Open Access Journal |
| issn | 0264-1275 |
| language | English |
| last_indexed | 2024-12-20T03:53:46Z |
| publishDate | 2021-01-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Materials & Design |
| spelling | doaj.art-b7124be0fa994cb8b2ae3582e7d2ce412022-12-21T19:54:23ZengElsevierMaterials & Design0264-12752021-01-01197109252Discontinuous lath martensite transformation and its relationship with annealing twin of parent austenite and cooling rate in low carbon RAFM steelChunliang Mao0Chenxi Liu1Liming Yu2Huijun Li3Yongchang Liu4State Key Lab of Hydraulic Engineering Simulation and Safety, State Key Lab of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin 300354, PR ChinaCorresponding authors.; State Key Lab of Hydraulic Engineering Simulation and Safety, State Key Lab of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin 300354, PR ChinaState Key Lab of Hydraulic Engineering Simulation and Safety, State Key Lab of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin 300354, PR ChinaState Key Lab of Hydraulic Engineering Simulation and Safety, State Key Lab of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin 300354, PR ChinaCorresponding authors.; State Key Lab of Hydraulic Engineering Simulation and Safety, State Key Lab of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin 300354, PR ChinaLath martensite transformation in low carbon steel relates to the discontinuity of the transformation rate, which exhibits a series of martensite transformation rate maxima (peaks), especially in low cooling rates. In the present work, we put an emphasis on the influence of annealing twins in parent austenite grains (PAGs) and cooling rates on the discontinuity of lath martensite transformation rate in a low carbon reduced activation ferritic/martensitic (RAFM) steel. Lath martensite microstructure is hierarchical and the lath martensite transformation rate peaks are hierarchical during the cooling process. If the cooling rate was not high enough, the lath martensite transformation rate peaks will be divided into two groups by annealing twins in parent austenite. These transformation rate peaks in the first group were mainly caused by lath martensite transformation in the non–twin zones in the PAGs. Then, the second group mainly consisted of a single transformation rate peak, which was primarily caused by the martensite transformation in the twin zones in the PAGs. In the present work, a new “localized stress field” theory is proposed and successfully used for interpreting the classification mechanism of lath martensite transformation rate peaks and the evolution of these peaks with changing cooling rate.http://www.sciencedirect.com/science/article/pii/S0264127520307875Discontinuous martensite transformationAnnealing twinMartensite variantAustenite reconstructionLocalized stress fieldLath martensite |
| spellingShingle | Chunliang Mao Chenxi Liu Liming Yu Huijun Li Yongchang Liu Discontinuous lath martensite transformation and its relationship with annealing twin of parent austenite and cooling rate in low carbon RAFM steel Materials & Design Discontinuous martensite transformation Annealing twin Martensite variant Austenite reconstruction Localized stress field Lath martensite |
| title | Discontinuous lath martensite transformation and its relationship with annealing twin of parent austenite and cooling rate in low carbon RAFM steel |
| title_full | Discontinuous lath martensite transformation and its relationship with annealing twin of parent austenite and cooling rate in low carbon RAFM steel |
| title_fullStr | Discontinuous lath martensite transformation and its relationship with annealing twin of parent austenite and cooling rate in low carbon RAFM steel |
| title_full_unstemmed | Discontinuous lath martensite transformation and its relationship with annealing twin of parent austenite and cooling rate in low carbon RAFM steel |
| title_short | Discontinuous lath martensite transformation and its relationship with annealing twin of parent austenite and cooling rate in low carbon RAFM steel |
| title_sort | discontinuous lath martensite transformation and its relationship with annealing twin of parent austenite and cooling rate in low carbon rafm steel |
| topic | Discontinuous martensite transformation Annealing twin Martensite variant Austenite reconstruction Localized stress field Lath martensite |
| url | http://www.sciencedirect.com/science/article/pii/S0264127520307875 |
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