Dynamic Strain Aging of 316L Stainless Steel During Uniaxial Fatigue Process at 600℃

doi:10.11901/1005.3093.2015.196

Chinese Journal of Materials Research

2016, Vol. 30

Issue (7): 496-502 DOI: 10.11901/1005.3093.2015.196

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Dynamic Strain Aging of 316L Stainless Steel During Uniaxial Fatigue Process at 600℃

JIN Dan^**(

), LI Jianghua, TIAN Dajiang

School of Energy and Power Engineering, Shenyang University of Chemical Technology, Shenyang, 110142, China

Cite this article:

JIN Dan, LI Jianghua, TIAN Dajiang. Dynamic Strain Aging of 316L Stainless Steel During Uniaxial Fatigue Process at 600℃. Chinese Journal of Materials Research, 2016, 30(7): 496-502.

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Abstract

Low cycle fatigue tests for different strain ranges were conducted for 316L stainless steel at 600℃ under uniaxial loading. The results show that the dynamic strain aging (DSA) can be observed for three strain ranges. The concept of stress drop has been introduced to characterize the degree of serrated yielding for different strain ranges. The difference in the serrated yielding amount for different strain ranges can be attributed to the different interactions between solute atoms and dislocations. The maximum stress drop is related to the cyclic hardening or cyclic softening. DSA is related to the number of cycles. The material presents the obvious DSA for a few cycles and then followed by weak serrated yielding, even disappearing. However, the serrated yielding can be observed again before fatigue failure. The difference of serrated yielding can be attributed to the types of atom atmospheres at different cycles. A-type serrated wave was observed for smaller strain range, however, types of A, B, A+B, C, and B+C serrated wave can be found for different cycles and different phases in one cycle for larger strain range. Finally, the crack source region and crack propagation region of the fatigue fracture were observed by SEM.

Key words: metallic materials 316L stainless steel dynamic strain aging(DSA) stress drop serrated wave atom atmospheres

Received: 31 July 2015

Fund: *Supported by National Natural Science Foundation of China No.11102119 and National Basic Research Program of China No 2011CB706504

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	Dan JIN
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https://www.cjmr.org/EN/10.11901/1005.3093.2015.196 OR https://www.cjmr.org/EN/Y2016/V30/I7/496

Fig.1 Shape and geometry of specimen (mm)

Table 1 Chemical Composition of Material

Fig.2 Hysteresis loops for different strain ranges at half-life

Fig.3 Relationship between the maximum stress drop and cycle (a) relationship between the maximum stress and cycle (b)

Fig.4 Hysteresis loops of different cycles for

Δ ε = 0.7 %

(Note: (1)—Tensile stage, (2)、(4)—Unloading stage, (3)—Compressive stage, (5)—Stress drop, (6)—Single serration length (N, cycle number)

Fig.5 Hysteresis loops of different cycles for

Δ ε = 1.0 %

Fig.6 Hysteresis loops of different cycles for

Δ ε = 1.2 %

Fig.7 SEM results of crack source region for different strain ranges (a) (d)

Δ ε = 0.7 %

(b) (e)

Δ ε = 1.0 %

Δ ε = 1.2 %

Fig.8 SEM results of crack propagation region for different strain ranges (a)

Δ ε = 0.7 %

, (b)

Δ ε = 1.0 %

, (c)

Δ ε = 1.2 %

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