In-situ neutron diffraction investigation of two-stage martensitic transformation in a 13%Mn steel with serrated deformation

Li, Feng; Gao, Pengfei; Chen, Yan; Li, Cheng; Shang, Xueliang; Wan, Peng; Chen, Weijian; Kang, Tao; Zhao, Zhengzhi; An, Ke

doi:10.1016/j.msea.2022.142955

Cited by 4 publications

(2 citation statements)

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“…Demonstrated by our former research [32,33,39], γ → ε → α phase transformation happened during the deformation of the hot-rolled 0B/30B steel and the TRIP effect acted as the main strengthening mechanism. Figure 8 shows the SEM and EBSD phase maps of 30B-600 and 30B-900 after fracture.…”

Section: Enhanced Mechanical Properties By the Introduction Of M 2 Bmentioning

confidence: 86%

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Effect of B Addition on Microstructure and Mechanical Properties of High-Strength 13Mn TRIP Steel with Different Annealing Temperatures

Gao

Liu

et al. 2022

Crystals

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The development of advanced high-strength steel has become the research focus of steel in order to meet low emission requirements. Different annealing temperatures from 600 °C to 900 °C were applied to 1200 MPa Grade 13Mn TRIP steels with (30B steel) or without B (0B steel). The effects of B addition on microstructure and mechanical properties with different annealing temperatures were investigated. Except for M2B in 30B steel, both steels annealed at 600 °C or 700 °C contained only austenite. When annealed at 800 °C or 900 °C, ε-martensite and α′-martensite were observed whereas 30B steel had less of them. 30B steel had higher yield strength (YS) and tensile strength (TS) regardless of the annealing temperature. Total elongation (TE) of 30B steel was smaller when annealed at 600 °C or 700 °C but larger at 800 °C or 900 °C. B addition refined austenite grains, and therefore depressed phase transformation to ε-martensite and α′-martensite during annealing. B addition enhanced YS and TS by refining grains, hindering dislocation movement and promoting phase transformation, but changed the fracture mechanism. The best TS × TE (53.62 GPa%) for 30B steel was reached when annealed at 800 °C. The more sufficiently triggered TRIP effect in high-temperature-annealed 30B steel accounts for its scarcely decreased TS and high TE.

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Section: Enhanced Mechanical Properties By the Introduction Of M 2 Bmentioning

confidence: 86%

“…30B steel exhibited TS always higher than 1200 MPa with varied YS and TE, whereas only 0B-700 reached TS of 1200 MPa for 0B steel. Serrations were observed on the curves due to dynamic strain aging [38] and discontinuous phase transformation [39]. In general, 30B steel had higher YS and TS than 0B steel.…”

Section: Mechanical Propertiesmentioning

confidence: 93%