Low-cycle fatigue properties of bimetallic steel bars after exposure to elevated temperature

A reduced-activation ferritic/martensitic (RAF/M) steel, JLF-1, is considered as one of the candidate structure material of the fusion reactors and supercritical water-cooled reactor (SCWR). Low cycle fatigue properties of JLF-1 steel at elevated temperature are the design base to provide adequate design margin against postulated mechanism that could experience during its design life, such as stress range, plastic deformation, and cyclic softening etc. However, the reduction in design margin is significant when the cyclic softening happens in cyclic deformation at RT, 673K, 873K. Thus, for the application as the structural materials, it is necessary to evaluate low cycle fatigue behavior and cyclic softening of JLF-1 steel at elevated temperature since those properties of material at elevated temperature are the key issue for design.

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Effect of SO2 and water vapour on the low-cycle fatigue properties of nickel-base superalloys at elevated temperature

Materials Science and Engineering A ◽

10.1016/j.msea.2012.11.079 ◽

2013 ◽

Vol 564 ◽

pp. 107-115 ◽

Cited By ~ 4

Author(s):

Johan J. Moverare ◽

Gunnar Leijon ◽

Håkan Brodin ◽

Frans Palmert

Keyword(s):

Elevated Temperature ◽

Water Vapour ◽

Low Cycle Fatigue ◽

Fatigue Properties ◽

Cycle Fatigue ◽

Nickel Base Superalloys ◽

Nickel Base

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High Strain Low Cycle Fatigue and Anti-Seismic Behavior of HRB400 QST Reinforced Steel Bars

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.250-253.1128 ◽

2011 ◽

Vol 250-253 ◽

pp. 1128-1133 ◽

Cited By ~ 1

Author(s):

Yu Kun Lv ◽

Guang Min Sheng ◽

Hao Fei Xue

Keyword(s):

High Strain ◽

Low Cycle Fatigue ◽

Hardened Layer ◽

Cyclic Stress ◽

Fatigue Properties ◽

Cycle Fatigue ◽

Steel Bars ◽

Reinforced Steel ◽

Surface Scan ◽

The Relationship

Based on the failure model of building structural steels under earthquake loading, High strain low cycle fatigue properties of HRB400QST (yield strength grade 400MPa, Quenched and Self Tempered) reinforced steel bars with diameters of 20mm and 16mm(unmachined) and HRB400V-N MA(microalloying)with diameters of 16mm (unmachined) were investigated. Based on the tests of total strain controlling, cycle strain response character of three kinds of steel bars and the relationship between cyclic stress and strain were researched. Hollomon and Coffin-Manson formulas were used to induce fatigue life formulas of three kinds of steel bars, and then the values of σa·Δεt were gained when Nf =100, calculated results show that the high strain low cycle fatigue properties of HRB400V-N MA rebars tested are much better than HRB400QST steel bars. Rupture surface scan reveals that surface hardened layer will reduce the cyclic toughness, and is bad for the anti-seismic performance.

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