Thermomechanical fatigue behaviour and damage mechanisms in a 9% Cr steel: Effect of strain rate

Yin, Peng; Zhang, Wei; Guo, Shen; Wen, Jian‐Bin; Zhang, Guodong; Xue, Fei; Zhao, Yanfen; Zhou, Changyu

doi:10.1016/j.msea.2021.141308

Cited by 13 publications

(6 citation statements)

References 55 publications

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“…56,69 In addition, to check whether the material has Masing behavior, the hysteretic curves of 9% Cr-based steel are transformed to the coordinate axis origin, as presented in Figure 11. It also indicates that 9% Cr-based steel follows the non-Masing behavior, 12,19,56 and our previous studies also confirmed that 9% Cr-based steel has non-Masing behavior. 10,12 Generally, the plastic strain energy model is used to evaluate the fatigue life, 49,70,71 as shown in Equations ( 8) and ( 9):…”

supporting

confidence: 73%

“…The cyclic response curves present the mechanical behavior during the LCF tests 12,19 . In this study, the cyclic response curves are presented in Figure 5, indicating the cyclic softening behavior at three strain ratios.…”

Section: Resultsmentioning

confidence: 68%

“…The cyclic response curves present the mechanical behavior during the LCF tests. 12,19 In this study, the cyclic response curves are presented in Figure 5, indicating the cyclic softening behavior at three strain ratios. For LCF tests, the stress amplitude at the high strain is larger than that of the low strain at the same strain ratio, as shown in Figure 5A-C.…”

Section: The Cyclic Response Behavior Under the Lcf Regime At 430 Cmentioning

confidence: 87%

“…As typical martensite steel, 9% Cr-based steel has apparent cyclic softening behavior under cyclic loading at different temperatures. 10,[12][13][14][15][16][17][18][19] Meanwhile, Grzegorz et al 20 pointed out that the grain size and the dislocation density were the main factors causing the cyclic softening. In addition, Barrett et al [21][22][23][24] also showed how to model microstructure degradation and evolution for capturing the cyclic softening measured and observed here.…”

Section: Introductionmentioning

confidence: 99%

“…As typical martensite steel, 9% Cr‐based steel has apparent cyclic softening behavior under cyclic loading at different temperatures 10,12–19 . Meanwhile, Grzegorz et al 20 pointed out that the grain size and the dislocation density were the main factors causing the cyclic softening.…”

Section: Introductionmentioning

confidence: 99%

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The cyclic response behavior, failure mechanism, and life prediction model of 9% Cr‐based steel under different strain ratios in the low cyclic fatigue regime at 430°C

Wang,

Cai,

Liu

et al. 2023

Fatigue Fract Eng Mat Struct

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During steam turbine rotor operation, the startup and showdown processes can cause asymmetric loading stress, leading to fatigue damage. To research the cyclic deformation behavior and fatigue failure mechanisms of 9% Cr‐based steel under asymmetric loading conditions, the strain ratios including −1, 0, and 0.1 are introduced into the low cyclic fatigue tests at 430°C. The results show the cyclic softening behavior is observed under three strain ratios at 430°C. As the strain ratio increases, the crack initiation sources, plastic strain, and consumed energy present an increasing trend. Comparing the microstructure morphology at different strain ratios, the coarsening lath and carbides affect fatigue crack initiation. Besides, the grain rotation and dynamic recrystallization can be observed, resulting in the cyclic softening behavior during the fatigue test. Finally, a new fatigue life prediction model is proposed at 430°C.

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