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Meeting Materials Science & Technology 2019
Symposium Advances in Understanding of Martensite in Steels
Presentation Title Substructure of Lenticular Martensite Formed from Austenite Containing Hydrogen in Fe-31Ni Alloy
Author(s) Akinobu Shibata, Masanori Enoki, Nahoko Saji, Hirotaka Tai, Motomichi Koyama, Hiroshi Ohtani, Kaneaki Tsuzaki, Nobuhiro Tsuji
On-Site Speaker (Planned) Akinobu Shibata
Abstract Scope It is well known that hydrogen degrades mechanical properties, that is, hydrogen embrittlement. However, there still remains a possibility for utilizing hydrogen effectively in steels if we can understand accurately influence of hydrogen on microstructures and properties of steels. The present study investigated effect of hydrogen on martensitic transformation behavior in an Fe-31Ni alloy. In both the hydrogen-charged and uncharged specimens, typical lenticular martensite plates formed after sub-zero cooling. However, the fraction of twinned region (including area of midrib) in lenticular martensite plate increased with increasing in hydrogen content, indicating that the existence of hydrogen facilitated twinning deformation as a lattice invariant deformation. Because the TEM observations and the first-principles calculations suggested that hydrogen might increase tetragonality of martensite, we concluded that solid solution hardening and increasing in tetragonality of martensite by hydrogen were the possible reasons for the facilitating twinning deformation as a lattice invariant deformation in martensitic transformation.
Proceedings Inclusion? Definite: At-meeting proceedings

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

Comparison of Transformation Potential Calculations for Two Martensitic Transformation Paths
Effect of Boron on Segregation Behavior on M-A Formation during Continuous Cooling
Effect of Tensile Stress on the Kinetics of Isothermal Martensitic Transformation
Flying Martensite: Transformations in Materials Design
Influence of Quenching Rate on Microstructure in High Carbon Steels
Martensite and Manufacturing- Alloy Development to Minimize Residual Stress in Large Ferrous Additive Manufactured Parts
Martensite Formation in the Intercritically Reheated Coarse Grained Heat Affected Zone of Line Pipe Steels
Microstructural Evolution of Conventionally and Rapidly Tempered Martensite in Medium-carbon Steels
Molybdenum and Niobium Alloying for Property Optimization of Quenched Steels
Multi Length-scale Instrumented Indentation Study on Dual-phase (DP) Steels
Phase Transformation Behaviors In Sandwich-like Clad Sheet Composed of Low and High Carbon Steels
Probabilistic Reconstruction of Prior Austenite Microstructure in Steels after Microstructure Refinement
Reverse Transformation from Martensite into Austenite in a Dual Phase Steel
Short Cycle Tempering of an 1800 MPa Grade of Press Hardening Steel
Substructure of Lenticular Martensite Formed from Austenite Containing Hydrogen in Fe-31Ni Alloy
Tools for Materials Design of Martensitic Materials
Understanding Martensite and Martensitic Phase Transformation under Extreme Environments
Use of In-situ Methods to Investigate the Deformation Induced Martensitic Transformation
Variant Structure of Martensite and Bainite in Steels

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