On the Strengthening Effects Affecting Tensile and Low Cycle Fatigue Properties of Low-Alloyed Seismic/Fire-Resistant Structural Steels

Sim, Jung-Ho; Kim, Tae-Yeong; Kim, Junyeon; Kim, Chiwon; Chung, Jihoon; Moon, Joonoh; Lee, Chang‐Hoon; Hocheng, H.

doi:10.1007/s12540-020-00870-y

Cited by 11 publications

(14 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The study by Voyiadjis et al [23] also demonstrated that grain boundaries lead to the hardening phenomenon during nanoindentation of FCC metals [23]. With the increase in the number of cycles, the significant dispersion of hardness values, as shown in Figure 7b-d, indicated inhomogeneous deformation of the microstructure [24][25][26].…”

Section: Hardness Response With Stress Distribution On the Surfacementioning

confidence: 83%

The Gradient Effect on Cyclic Behavior of 316L Stainless Steel in the Ultrasonic Bending Test

Hu,

Tang,

Liu

et al. 2024

Materials

View full text Add to dashboard Cite

Nanoindentation measurements were conducted to investigate the high-cycle response of 316L stainless steel in bending fatigue. Hardness variation owing to the gradient flexure stress amplitude for different curvatures was plotted along with the thickness and length, respectively. Scanning electron microscopy (SEM) was subsequently conducted to explore the deformation characteristics in multiple layers, which had cyclic gradient stress, on the cross-section of specimens. The nanoindentation results indicated that the cyclic hardening response of 316L stainless steel is correlated with the level of stress amplitude in the high-cycle fatigue (HCF) regime. Furthermore, an analytical model was proposed to clarify the relationship between nanohardness and stress amplitude. Finally, the evolution of damage accumulation due to irreversible plastic deformation is continuous during stress reduction up to the neighboring zone at the neutral surface of the flexure beam in some individual grains.

show abstract

Section: Hardness Response With Stress Distribution On the Surfacementioning

confidence: 83%

The Gradient Effect on Cyclic Behavior of 316L Stainless Steel in the Ultrasonic Bending Test

Hu,

Tang,

Liu

et al. 2024

Materials

View full text Add to dashboard Cite

show abstract

“…In the bainite microstructure, the higher dislocation density in the ferrite grains leads to effective suppression of the recovery or annihilation of dislocations at elevated temperatures. [ 21,22 ] In the study by Sim et al, [ 11 ] the bainitic microstructure was maintained even after 1000 h of thermal exposure at 600 °C. Furthermore, the increased number of nucleation sites for carbonitrides and diffusion channels for solute atoms accelerates the nucleation and growth of carbonitrides of the microalloying elements.…”

Section: Resultsmentioning

confidence: 99%

“…Some of the TiC may correspond to the nanoscale (Ti,Mo)‐rich MX precipitates previously identified. [ 11 ] A replica method was used to visualize the size and number density of the precipitates in the samples. TEM micrographs of the precipitates from representative carbon replica specimens are shown in Figure 6 .…”

Section: Resultsmentioning

confidence: 99%

“…The b value was set at 0.25 nm for both the ferrite and the bainite matrix. [ 11 ] The average diameters, X , of the precipitates were 7, 7, and 5 nm for s2, s3, and s4, respectively. In addition to the representative TEM micrographs in Figure 6, a few more micrographs for each steel were used to obtain the size distribution of the precipitates, which are presented in Figure S5, Supporting Information.…”

Section: Resultsmentioning

confidence: 99%

“…Among these elements, Mo is usually considered essential for improving the high‐temperature strength not only through solid solution strengthening, but also by promoting the bainite microstructure. [ 6–11 ] Commercial fire‐resistant steels usually include 0.3–0.5 wt% Mo. [ 5,12 ] In KS D 3865, it is specified that the Mo content of FR355 steel should be 0.3–0.9 wt%.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Effect of Ti Addition on Yield Strength of Low‐Mo Fire‐Resistant Steel at Elevated Temperatures

Choi

Kim

Hocheng

et al. 2022

steel research int.

Self Cite

View full text Add to dashboard Cite

Herein, a series of low‐Mo (0.2 wt%) fire‐resistant steels with varying amounts of Ti (0.008–0.13 wt%) are investigated to study the effects of Ti on yield strength at elevated temperatures. At room temperature (RT), precipitation strengthening by nanoscale TiC precipitates is found to be the major factor for the enhanced strength. The amount of TiC precipitates and both the yield and tensile strengths increase monotonically with the Ti content. However, the yield strength ratio (YS at 600 °C divided by YS at RT) of the steel with the highest Ti content (0.13 wt%) is significantly reduced to 0.6. In contrast, the YS ratio of the steels with Ti content in the range of 0.008–0.087 wt% remains above 0.7 and increases with Ti content. The difference between the steels lies in the B content and the resultant bainite volume fraction. The steel with 0.13 wt% Ti does not contain B and has only 4% bainite, whereas the other steels contain 20 ppm B and approximately 60% bainite. Hence, a microstructure with a sufficient fraction of bainite is required to ensure strength at elevated temperatures. The properties can be further improved by Ti precipitation strengthening.

show abstract

Inclusion Agglomeration on Ultra-Low C Liquid Steel Surface: Roles of Ti in the Steel and the Oxygen Potential

et al. 2022

View full text Add to dashboard Cite

On the Strengthening Effects Affecting Tensile and Low Cycle Fatigue Properties of Low-Alloyed Seismic/Fire-Resistant Structural Steels

Cited by 11 publications

References 24 publications

The Gradient Effect on Cyclic Behavior of 316L Stainless Steel in the Ultrasonic Bending Test

The Gradient Effect on Cyclic Behavior of 316L Stainless Steel in the Ultrasonic Bending Test

Effect of Ti Addition on Yield Strength of Low‐Mo Fire‐Resistant Steel at Elevated Temperatures

Inclusion Agglomeration on Ultra-Low C Liquid Steel Surface: Roles of Ti in the Steel and the Oxygen Potential

Contact Info

Product

Resources

About