Issue 33

M. Sakane et alii, Frattura ed Integrità Strutturale, 33 (2015) 319-334; DOI: 10.3221/IGF-ESIS.33.36 334 4. Stacking fault, cell, twin and dislocation bundles were observed in 304SS cyclically loaded under 14 proportional and nonproportional strain paths at 823 K as well as at room temperature. The similar critical boundary was also found at 823K but the boundary was shifted downwards at 823K, compared with room temperature. Hall-Petch relationship also held at 823K but the cell size was four times smaller to yield the same principal stress range than at room temperature. R EFERENCES [1] Socie, D., Marquis, G., Multiaxial Fatigue, Society of Automotive Engineers, Inc., Philadelphia, (2000). [2] Itoh, T., Sakane, M., Ohnami, M., Ameyama, K., Effect of Stacking Fault Energy on Cyclic Constitutive Relation under Nonproportional Loading, J. Soc. Materials Science, Japan, 41(1992) 1361-1367. [3] Itoh, T., Yang, T., Material Dependence of Multiaxial Low Cycle Fatigue Lives under Non-proportional Loading, International J. Fatigue, 33(2011) 1025-1031. [4] Nishino, S., Hamada, N., Sakane, M., Ohnami, M., Matsumura, N., Tokizane, M., Microstructural Study of Cyclic Strain Hardening Behavior in Biaxial Stress States at Elevated Temperature, Fatigue Fract. Eng. Mater. Struct., 9(1986) 65-77. [5] Doong, SH., Dislocation Substructures and Nonproportional Hardening, Trans. ASME, JEMT, 112 (1990) 456-464. [6] Clavel, M., Feaugas, X., Micromechanisms of Plasticity under Multiaxial Cyclic Loading, Multiaxial Fatigue and Design, ESIS 21, Mechanical Engineering Publication, (1996) 21-41. [7] Kida, S., Itoh, T., Sakane, M., Ohnami, M., Socie, D., Dislocation Structure and Non-Proportional Hardening of Type 304 Stainless Steel, Fatigue Fract. Eng. Mater. Struct., 20(1997) 1375-1386. [8] Xiao, Lin., Umakoshi, T., Sun, J., Biaxial Low Cycle Fatigue Properties and Dislocation Substructures of Zircaloy-4 under In-phase and Out-of-phase Loading, Materials Science and Engineering, A292(2000) 40-48. [9] Xiaoshan, L., Guoqiu, H., Xiangqun, D., Defeng, M. Weihua Z., Fatigue Behavior and Dislocation Substructure for 6063 Aluminum Alloy under Nonproportional Loadings, International J. Fatigue, 31(2009) 1190-1195. [10] Dong, Y., Kang, G., Liu, Y., Wang, H., Chan, X., Dislocation Evolution in 316L Stainless during Multiaxial Ratchetting Deformation, Materials Characterization, 65(2012) 62-72. [11] Mura T., Shirai, H., Weertman, J. R., The Elastic Energy of Dislocation Structure in Fatigued Metals, Proc. 2nd Inter. Symp. And 7th Canadian Fracture Conference on Defects, Fracture and Fatigue, (1982) 67-74. [12] Itoh, T., Sakane, M., Ohanami, M., Socie, D., Nonproportional Low Cycle Fatigue Criterion for Type 304 Stainless Steel, Trans. ASME, JEMT, 117(1995) 285-292. [13] McDowell, D., Stahl, D., Stock, S., Antolovich, S., Biaxial Path Dependence of Deformation Substructure of Type 304 Stainless Steel, Metallurgical Trans. A 19A(1988) 1277-1293.