On the Relationship Between Cyclic Deformation Behavior and Slip Mode in 316LN Stainless Steel with Varying Nitrogen Content

2015 ◽  
Vol 69 (2) ◽  
pp. 303-308 ◽  
Author(s):  
G. V. Prasad Reddy ◽  
R. Sandhya ◽  
S. Sankaran ◽  
K. Laha
Keyword(s):  
Stainless Steel ◽  
Nitrogen Content ◽  
Cyclic Deformation ◽  
Deformation Behavior ◽  
Slip Mode ◽  
316Ln Stainless Steel ◽  
The Relationship

EBSD based studies on various modes of cyclic deformation at 923 K in a type 316LN stainless steel

2018 ◽  
Vol 723 ◽  
pp. 229-237 ◽  
Author(s):  
Aritra Sarkar ◽  
Manmath Kumar Dash ◽  
A. Nagesha ◽  
Arup Dasgupta ◽  
R. Sandhya ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Cyclic Deformation ◽  
316Ln Stainless Steel ◽  
Type 316Ln Stainless Steel

scholarly journals A Comparison of Amplitude-and Time-Dependent Cyclic Deformation Behavior for Fully-Austenite Stainless Steel 316L and Duplex Stainless Steel 2205

Materials ◽  
2021 ◽  
Vol 14 (19) ◽  
pp. 5594
Author(s):  
Shaohua Li ◽  
Wenchun Jiang ◽  
Xuefang Xie ◽  
Zhilong Dong
Keyword(s):  
Stainless Steel ◽  
Duplex Stainless Steel ◽  
Cyclic Deformation ◽  
Deformation Behavior ◽  
Structural Integrity ◽  
Low Cycle Fatigue ◽  
Cyclic Softening ◽  
Plastic Strain Amplitude ◽  
Cyclic Plasticity ◽  
Stainless Steel 316L

Austenite and duplex stainless steels are widely used in engineering, and the latter exhibits a more excellent combination of mechanical properties and corrosion resistance due to the coexistence of austenite and ferrite and higher nitrogen. However, fatigue failure still threatens their structural integrity. A comprehensive comparison of their cyclic deformation behavior is a major foundation to understand the role of duplex-phase microstructure and nitrogen in the safety assessment of engineering components. Thus, in this paper, the cyclic deformation behavior of fully-austenitic stainless steel 316L and duplex stainless steel 2205 was studied by a series of low cycle fatigue tests with various strain amplitudes, loading rates and tensile holding. A theoretical mechanism diagram of the interaction between nitrogen and dislocation movements during cyclic loads was proposed. Results show that the cyclic stress response of 2205 was the primary cyclic hardening, followed by a long-term cyclic softening regardless of strain amplitudes and rates, while an additional secondary hardening was observed for 316L at greater strain amplitudes. Cyclic softening of 2205 was restrained under slower strain rates or tensile holding due to the interaction between nitrogen and dislocations. The cyclic plasticity of 2205 started within the austenite, and gradually translated into the ferrite with the elevation of the cyclic amplitude, which lead to a decreased hardening ratio with the increase in amplitude and a shorter fatigue life for a given smaller plastic strain amplitude.

Effects of Strain Amplitude and Loading Path on Cyclic Behavior and Martensitic Transformation of 304 Stainless Steel

2018 ◽  
Author(s):  
Yajing Li ◽  
Dunji Yu ◽  
Xu Chen
Keyword(s):  
Stainless Steel ◽  
Martensitic Transformation ◽  
Strain Amplitude ◽  
Cyclic Deformation ◽  
Deformation Behavior ◽  
Secondary Hardening ◽  
304 Stainless Steel ◽  
Loading Path ◽  
Martensite Content ◽  
Number Of Cycles

Effects of strain amplitude and loading path on cyclic deformation behavior and martensitic transformation of 304 stainless steel were experimentally investigated at room temperature. Series of symmetrical strain-control low cycle fatigue tests with strain amplitude ranging from 0.4% to 1.0% and various loading paths (uniaxial, torsional, proportional, rhombus, square and circular) with the same equivalent strain amplitude of 0.5% were carried out. Three-stage cyclic deformation behavior containing initial hardening, cyclic softening or saturation, and secondary hardening as well as near-linear relationship between α’-martensite content and number of cycles was observed during the whole life regime as for each test. Besides, a nearly linear relation between peak stress and α’-martensite content was found during secondary hardening stage. Furthermore, higher strain amplitude or non-proportionality of loading path resulted in higher cyclic stress response and α’-martensite content growth rate, defined by the slope of curves of α’-martensite content versus number of cycles.

Sign in / Sign up

Export Citation Format

Share Document