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Chinese Journal of Materials Research  2022, Vol. 36 Issue (11): 845-849    DOI: 10.11901/1005.3093.2021.447
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Micromechanism of Fatigue Failure under Non-proportional Loading for 316L Stainless Steel
JIN Dan(), HAN Gaofeng, LONG Haoyue, JIN Kai
School of Mechanical and Power Engineering, Shenyang University of Chemical Technology, Shenyang 110142, China
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JIN Dan, HAN Gaofeng, LONG Haoyue, JIN Kai. Micromechanism of Fatigue Failure under Non-proportional Loading for 316L Stainless Steel. Chinese Journal of Materials Research, 2022, 36(11): 845-849.

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Abstract  

Low cycle fatigue experiments for 316L stainless steel were carried out under circular loading and different strain ranges at 600℃. The microstructures near the fatigue fracture were observed by transmission electron microscope (TEM). The path correlation and amplitude correlation of dislocation structure and the path correlation of dynamic strain aging (DSA) were investigated based on the experimental results. The results show that at room temperature and 600℃, the planar slip is significant under uniaxial loading and the choroid dislocation structure formed. However, the equiaxed cellular dislocation structures are exhibited under circular loading, which reduces the deformation resistance of the material significantly. For equivalent strain range 1.0%, the fatigue life under circular loading is 81% lower than that of the uniaxial loading at 600℃. At the same time, the minimum equivalent strain range required to form a cellular dislocation structure under the circular loading is lower than that of the uniaxial loading. At 600℃, the DSA effect is more complete under circular loading, and the maximum stress drop for equivalent strain range 1.0% increases by 680% compared with that under uniaxial loading. The DSA phenomenon is more evident in the compression stage, and the sawtooth type gradually transitions from type A, type B to type C.
Key words:  metallic materials      316L stainless steel      dynamic strain aging      circular loading      dislocation      sawtooth type     
Received:  13 August 2021     
ZTFLH:  TG142.71  
Fund: National Natural Science Foundation of China(11102119);Education Department of Liaoning Province(LJKZ0437)
About author:  JIN Dan, Tel: 13609880376, E-mail: jindan76@163.com
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Dan JIN
Gaofeng HAN
Haoyue LONG
Kai JIN

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https://www.cjmr.org/EN/10.11901/1005.3093.2021.447     OR     https://www.cjmr.org/EN/Y2022/V36/I11/845

Fig.1  Shape and geometry of specimen
Fig.2  Semi-life hysteretic loops under circular loading for equivalent strain ranges 0.7% and 1.0%
Fig.3  Dislocation structure near fatigue fracture under equivalent strain range 1.0% (a) uniaxial path, RT[13], (b) uniaxial path, 600℃[7], (c) circular path, RT[9]
Fig.4  Dislocation structure near fatigue fracture for different equivalent strain ranges (a) (b) ?εeq=0.7%, (c) (d) ?εeq=1.0%
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