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Article

In Situ Observation for Deformation-Induced Martensite Transformation (DIMT) during Tensile Deformation of 304 Stainless Steel Using Neutron Diffraction. PART I: Mechanical Response

by 1,* and 2
1
Frontier Research Center for Applied Atomic Sciences, Ibaraki University 162-1 Shirakata, Tokai, Ibaraki 319-1106, Japan
2
Graduate School of Science and Engineering, Ibaraki University 4-12-1 Nakanarusawa, Hitachi, Ibaraki 316-8511, Japan
*
Author to whom correspondence should be addressed.
Quantum Beam Sci. 2020, 4(3), 31; https://0-doi-org.brum.beds.ac.uk/10.3390/qubs4030031
Received: 14 July 2020 / Revised: 1 September 2020 / Accepted: 10 September 2020 / Published: 11 September 2020
(This article belongs to the Special Issue Analysis of Strain, Stress and Texture with Quantum Beams)
304 stainless steel is one of the most common stainless steels due to its excellent corrosion resistance and mechanical properties. Typically, a good balance between ductility and strength derives from deformation-induced martensite transformation (DIMT), but this mechanism has not been fully explained. In this study, we conducted in situ neutron diffraction measurements during the tensile deformation of commercial 304 stainless steel (at room temperature) by means of a Time-Of-Flight type neutron diffractometer, iMATERIA (BL20), at J-PARC MLF (Japan Proton Accelerator Research Complex, Materials and Life Science Experimental Facility), Japan. The fractions of α′-(BCC) and ε-(HCP) martensite were quantitatively determined by Rietveld-texture analysis, as well as the anisotropic microstrains. The strain hardening behavior corresponded well to the microstrain development in the austenite phase. Hence, the authors concluded that the existence of martensite was not a direct cause of hardening, because the dominant austenite phase strengthened to equivalent values as in the martensite phase. Moreover, the transformation-induced plasticity (TRIP) mechanism in austenitic steels is different from that of low-alloy bainitic TRIP steels. View Full-Text
Keywords: TRIP effect; neutron diffraction; 304 stainless steel TRIP effect; neutron diffraction; 304 stainless steel
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MDPI and ACS Style

Onuki, Y.; Sato, S. In Situ Observation for Deformation-Induced Martensite Transformation (DIMT) during Tensile Deformation of 304 Stainless Steel Using Neutron Diffraction. PART I: Mechanical Response. Quantum Beam Sci. 2020, 4, 31. https://0-doi-org.brum.beds.ac.uk/10.3390/qubs4030031

AMA Style

Onuki Y, Sato S. In Situ Observation for Deformation-Induced Martensite Transformation (DIMT) during Tensile Deformation of 304 Stainless Steel Using Neutron Diffraction. PART I: Mechanical Response. Quantum Beam Science. 2020; 4(3):31. https://0-doi-org.brum.beds.ac.uk/10.3390/qubs4030031

Chicago/Turabian Style

Onuki, Yusuke, and Shigeo Sato. 2020. "In Situ Observation for Deformation-Induced Martensite Transformation (DIMT) during Tensile Deformation of 304 Stainless Steel Using Neutron Diffraction. PART I: Mechanical Response" Quantum Beam Science 4, no. 3: 31. https://0-doi-org.brum.beds.ac.uk/10.3390/qubs4030031

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