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neutron diffraction measurement during tensile deformation山下 享介*; 諸岡 聡; Gong, W.; 川崎 卓郎; Harjo, S.; 北條 智彦*; 興津 貴隆*; 藤井 英俊*
ISIJ International, 64(14), p.2051 - 2060, 2024/12
被引用回数：1 パーセンタイル：11.50(Metallurgy & Metallurgical Engineering)An Fe-0.15C-5Mn-0.5Si-0.05Nb steel annealed at 660
C and 685C showed L
ders deformation followed by high work hardening, with variations in Lders strain and hardening behavior. 
neutron diffraction during tensile tests analyzed phase stresses, strength contributions, and austenite orientation. Deformation-induced martensite contributed 
1000 MPa to strength near tensile failure, while austenite mainly enhanced ductility via transformation-induced plasticity. Austenite transformed to martensite during Lders deformation regardless of orientation, though 311-oriented grains tended to remain along the tensile direction.
neutron diffraction measurement during tensile deformation山下 享介*; 諸岡 聡; Gong, W.; 川崎 卓郎; Harjo, S.; 北條 智彦*; 興津 貴隆*; 藤井 英俊*
鉄と鋼, 110(3), p.241 - 251, 2024/02
被引用回数：0 パーセンタイル：0.00(Metallurgy & Metallurgical Engineering)A Fe-0.15C-5Mn-0.5Si-0.05Nb medium Mn steel annealed at 660C and 685C both exhibited inhomogeneous deformation with Luders deformation and extremely high work hardening rates, but with different Luders strain and work hardening behavior. 
neutron diffraction measurements during tensile test were performed to investigate changes in the phase stresses and in the contributed stresses to the strength of the constituent phases, and crystal orientation of austenite. The role of each constituent phase in the deformation and the effect of crystallographic orientation on austenite stability were discussed. Deformation induced martensite showed excellent phase stress and contributed to the strength approximately 1000 MPa, which is close to macroscopic tensile strength.
neutron diffraction study on the deformation of a TRIP-assisted multi-phase steel composed of ferrite, austenite and martensiteLavakumar, A.*; Park, M. H.*; Gao, S.*; 柴田 曉伸*; 興津 貴隆*; Gong, W.; Harjo, S.; 辻 伸泰*
IOP Conference Series; Materials Science and Engineering, 580, p.012036_1 - 012036_6, 2019/09
被引用回数：4 パーセンタイル：84.33(Engineering, Mechanical)Multi-phase steels showing transformation induced plasticity (TRIP), can exhibit an excellent combination of high strength and good ductility by the aid of martensitic transformation during deformation. Even though TRIP-assisted multi-phase steels have been widely used in industry, the role of each phase in the enhancement of mechanical properties is still unclear given their complicated microstructures. In order to understand better the nature of the TRIP effect, the mechanical interaction between different phases at the micro-scale should be clarified. In the present study, the mechanical behavior of a transformation induced plasticity (TRIP) assisted multi-phase steel, has been characterized by neutron diffraction during tensile testing. The result of strain partitioning between the different phases obtained from the neutron analysis revealed that the martensite phase took much more elastic strain than the ferrite and retained austenite phases, which suggests that the work hardening behavior in the present steel is affected by the higher load borne by deformation-induced martensite.
