Phase Stress Partition in Gray Cast Iron Using In Situ Neutron Diffraction Measurements
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Phase Stress Partition in Gray Cast Iron Using In Situ Neutron Diffraction Measurements TU-NGOC LAM, SZU-CHIEN WU, HOBYUNG CHAE, SHI-WEI CHEN, JAYANT JAIN, SOO YEOL LEE, KE AN, SVEN C. VOGEL, SUNG-MAO CHIU, DUNJI YU, and E-WEN HUANG Gray cast iron comprises a-Fe, Fe3C and graphite with their different anisotropies in terms of structure and mechanical behavior. We perform two different deformation paths as tension-compression and compression-tension on bulk gray iron to capture the stress partitioning. Using in situ neutron diffraction, the composite-like deformation behaviors of a-Fe and Fe3C are revealed simultaneously. Within the elastic deformation stage, both deformation paths do not cause load transfer. However, when the applied compressive stress exceeds 300 MPa, there is a clear load sharing in both paths. From microscopic examinations, the debonding between matrix and graphite is clarified. https://doi.org/10.1007/s11661-020-05933-8 The Minerals, Metals & Materials Society and ASM International 2020
I.
INTRODUCTION
THE gray cast iron is a widely used material because of its economic cost. Due to increasing demands on the equipment for renewable energy, such as multi-megawatt wind turbines[1] and other devices,[2] cast iron is expected to continue its important role.[3]
TU-NGOC LAM is with the Department of Materials Science and Engineering, National Chiao Tung University, 1001 University Road, Hsinchu 30010, Taiwan and also with the Department of Physics, College of Education, Can Tho University, Can Tho City 900100, Vietnam. SZU-CHIEN WU is with the Department of Materials Science and Engineering, National Chiao Tung University. HOBYUNG CHAE is with the Department of Materials Science and Engineering, Chungnam National University, Daejeon 34134, Republic of Korea. SHI-WEI CHEN is with the National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan. JAYANT JAIN is with the Department of Materials Science and Engineering, Indian Institute of Technology, New Delhi, 110016, India. SOO YEOL LEE is with the Department of Materials Science and Engineering, Chungnam National University. KE AN is with the Neutron Scattering Division, the Spallation Neutron Source, Oak Ridge National Laboratory, Oak Ridge, TN 37831. SVEN C. VOGEL is with the Los Alamos Neutron Science Center, Los Alamos National Laboratory, Los Alamos, NM 87545. SUNG-MAO CHIU is with the Metal Industries Research and Development Centre, Kaohsiung 81160, Taiwan. DUNJI YU is with the Neutron Scattering Division, the Spallation Neutron Source, Oak Ridge National Laboratory. E-WEN HUANG is with the Department of Materials Science and Engineering, National Chiao Tung University and also with the High Entropy Materials Center, National Tsing Hua University, Hsinchu 30013, Taiwan. Contact e-mail: [email protected] Manuscript submitted March 1, 2020.
METALLURGICAL AND MATERIALS TRANSACTIONS A
Although gray irons have been investigated extensively,[2,4–7] the microstructure and phase-dependent deformation mechanisms have only recently begun
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