Correlation between the cyclic stress behavior and microstructure in 316LN based on the analysis of hysteresis loops

Abstract

Total strain controlled cyclic test was performed on 316LN under uniaxial loadings. Through the partitioning of hysteresis loops, the evolution of two components of cyclic flow stress, the internal and effective stresses, was reported. The former one determines the cyclic stress response. Based on the transmission electron microscopic (TEM) observation on specimens loaded with scheduled cycles, it is found that planar dislocation structures prevail during the entire cyclic process at low strain amplitude, while a remarkable dislocation rearrangement from planar structures to heterogeneous spatial distributions is companied by a cyclic softening behavior at high strain amplitude. The competition between the evolution of the intergranular and the intragranular components of the internal stress caused by the transition of slip mode induces the cyclic hardening and softening at high strain levels. The intergranular internal stress represents the most part of the internal stress at low strain level.

Keywords

cyclic stress behavior / partitioning of hysteresis loops / microstructure / dislocation rearrangement / internal stress

References

[1] Simmons JW Overview: High-nitrogen Alloying of Stainless Steel[J]. Mater. Sci. Eng. A, 1996, 207: 159-169.

[2] Lee TH, Oh CS, Kim SJ, . Deformation Twinning of High-nitrogen Austenitic Stainless Steel[J]. Acta. Mater., 2007, 55: 3 649-3 622.

[3] Vogt J-B Fatigue Properties of High Nitrogen Steels[J]. J. Mater. Process Tech., 2001, 117: 364-369.

[4] Seeger A Defects in Crystalline Solids[M], 1955 London The Phys. Soc. 328-333.

[5] Cottrell AH Dislocation in Plasticity Flow in Crystals[M], 1953 London Oxford University Press 111-116.

[6] Dickson JL, Boutin J, Handifield L A Comparison of Two Simple Methods for Measuring Cyclic Internal and Effective Stresses[J]. Mater. Sci. Eng., 1984, 64: L7-L11.

[7] Kuhlmann-Wilsdorf D, Laird C Dislocation Behavior in Fatigue II. Friction Stress and Back Stress as Inferred from an Analysis of Hystere Loops[J]. Mater. Sic. Eng, 1979, 37: 111-120.

[8] Alvarez-Armas I, Marinelli MC, Hereňú S, . On the Cyclic Softening Behavior of SAF 2507 Duplex Stainless Steel[J]. Acta Mater., 2006, 54: 5 041-5 049.

[9] Vogt J-B T. Magnin, Foct J. Effective Stresses and Microstructure in Cyclically Deformed 316L Austenitic Stainless Steel: Effect of Temperature and Nitrogen Content[J]. Fatigue Fract. Eng. Mater. Struct., 1993, 16: 555-564.

[10] Taleb L, Hauet A Multiscale Experimental Investigations about the Cyclic Behavior of the 304L SS[J]. Int J. Plasticity, 2009, 25: 1 359-1 385.

[11] Gaudin C, Feaugas X Cyclic Process in AISI 316L Stainless Steel in Terms of Dislocation Patterns and Internal Stress[J], 2004, 52: 3 097-3 110.

[12] Polák J, Fardoun F, Degallaix S Effective and Internal Stresses in Cyclic Straining of 316 Stainless Steel[J]. Mater. Sci. Eng. A, 1996, 215: 104-112.

[13] Polák J, Fardoun F, Degallaix S Analysis of the Hysteresis Loop in Stainless steels I. Austenitic and Ferritic Steels[J]. Mater. Sci. Eng. A, 2001, 297: 144-154.

[14] Fournier B, Sauzay M, Noblecourt M, . Analysis of the Hysteresis Loops of a Martensitic Steel Part I: Study of the Influence of Strain Amplitude and Temperature under Pure Fatigue Loadings Using an Enhanced Stress Partitioning Method[J]. Mater. Sci. Eng. A, 2006, 437: 183-196.

[15] Alvarez-Armas I, Armas AF, Hereňú S, . Correlation between Cyclic Deformation Behavior and Microstructure in a Duplex Steel between 300 and 773 K[J]. Fatigue Fract. Eng. Mater., 2003, 26: 27-35.

[16] Feaugas X On the Origin of the Tensile Flow Stress in the Stainless Steel AISI 316L at 300K: Back Stress and Effective Stress[J]. Acta Mater., 1999, 47(13): 3 617-3 632.

[17] Byrnes MLG, Grujicic M, Owen WS Nitrogen Strengthening of a Stable Austenitic Stainless Steel[J]. Acta Metall., 1987, 35: 1 853-1 858.

[18] Takemoto T, Mukai K, Hoshino K Effect of Nitrogen on Low Cycle Fatigue Behavior of Austenitic Stainless Steel[J]. Trans. ISIJ, 1986, 26: 337-344.

[19] Mllner P, Solenthaler C, Uggowizer P, . On the Effect of Nitrogen on the Dislocation Structure of Austenitic Stainless Steel[J]. Mater. Sci. Eng. A, 1993, 164: 164-169.

[20] Gerold V, Karnthaler HP On the Origin of Planar Slip in F.C.C. Alloys[J]. Acta Metall., 1989, 37: 2 177-2 183.

[21] Degallaix S, Taillard R, Foct J Role of Nitrogen Interstitials in Plastic Fatigue of Austenitic Stainless Steels[C]. Proceedings of Fatigue, 1984, 84: 49-59.

[22] Mughrabi H Dislocation Wall and Cell Structures and Long-range Internal Stresses in Deformed Metal Cycstals[J]. Acta Metall., 1983, 31(9): 1 367-1 379.