High Temperature Fatigue Behavior of 23Cr26Ni Heat Resistant Steel

2010 ◽  
Vol 452-453 ◽  
pp. 433-436
Author(s):  
Hee Woong Lee ◽  
S.I. Kwun ◽  
Woo Sang Jung
Keyword(s):  
High Temperature ◽  
Dislocation Density ◽  
Low Cycle Fatigue ◽  
Fatigue Behavior ◽  
Solution Treatment ◽  
Cyclic Hardening ◽  
Resistant Steel ◽  
Heat Resistant Steel ◽  
High Temperature Fatigue ◽  
Heat Resistant

The influence of the cooling condition after solution treatment on the high temperature fatigue resistance of 23Cr-26Ni heat resistant steel was investigated. Two different cooling conditions were applied to the steel after solution treatment at 1230oC for 3 hours. One specimen was water quenched immediately after the solution treatment. The other one was furnace cooled at a rate of 0.5oC/min down to 750oC after the solution treatment. Then, both specimens were aged at 750oC for 5 hours. The low cycle fatigue (LCF) test was conducted to investigate the influence of high temperature on the LCF behaviors of the heat-resistant 23Cr26Ni alloy. Under two different heat treatment conditions, the LCF test was performed at total strain amplitudes ranging from ±0.4~0.9% at room temperature (RT) and 600°C. During the test, initial cyclic hardening occurred at both experimental temperatures. This phenomenon was attributed to the increase in the dislocation density due to cyclic deformation, which resulted in the interaction between the newly created dislocations and precipitates. Cyclic softening was observed in the later stages of the LCF test at RT. The formation of precipitates and increase in the dislocation density were observed using TEM. Also, the XRD and EDS techniques were used to verify the type and composition of the precipitates.

scholarly journals Low cycle fatigue behavior and microstructure evolution of a novel Fe-22Cr-15Ni austenitic heat-resistant steel

2020 ◽  
Vol 9 (6) ◽  
pp. 14388-14400
Author(s):  
Lianyong Xu ◽  
Shangqing Yang ◽  
Lei Zhao ◽  
Yongdian Han ◽  
Hongyang Jing ◽  
...  
Keyword(s):  
Microstructure Evolution ◽  
Low Cycle Fatigue ◽  
Fatigue Behavior ◽  
Resistant Steel ◽  
Cycle Fatigue ◽  
Heat Resistant Steel ◽  
Heat Resistant

A study on low-cycle fatigue of high chromium heat-resistant steel

2019 ◽  
Vol 33 (14n15) ◽  
pp. 1940034
Author(s):  
Il Heon Jeong ◽  
Yeong Min Park ◽  
Mun Ki Bae ◽  
Chi Hwan Kim ◽  
Tae Gyu Kim
Keyword(s):  
Plastic Deformation ◽  
High Temperature ◽  
Nuclear Power ◽  
Low Cycle Fatigue ◽  
Turbine Blades ◽  
Resistant Steel ◽  
Cycle Fatigue ◽  
Heat Resistant Steel ◽  
Heat Resistant ◽  
Treatment Conditions

The purpose of this study is to examine the low-cycle fatigue (LCF) characteristics of high-chrome heat-resistant steel, which is used in a high-temperature environment, at both ambient and high temperature. High-chrome heat-resistant steel, which is used for the turbine blades of a nuclear power plant, can be subject to plastic deformation due to overloading conditions at startup and shutdown. It is therefore very important to evaluate the damage caused by LCF, which is considered as fatigue damage due to plastic deformation. To examine the mechanical properties of high-chrome heat-resistant steel, the tensile strength was tested under different heat treatment conditions. In addition, the LCF characteristics were tested at ambient temperature and [Formula: see text].

Effects of Laser Multiple Processing on Properties of Heat-Resistant Steel

2011 ◽  
Vol 328-330 ◽  
pp. 364-367
Author(s):  
Liang Ruan ◽  
Xu Dong Ren ◽  
Yong Zhuo Huangfu ◽  
Yong Kang Zhang
Keyword(s):  
High Temperature ◽  
Fatigue Life ◽  
Resistant Steel ◽  
Laser Shock ◽  
Laser Shock Processing ◽  
Heat Resistant Steel ◽  
High Temperature Fatigue ◽  
Heat Resistant ◽  
Shock Processing ◽  
Multiple Processing

The heat-resistant steel after aluminized was treated by laser shock processing (LSP) with high power Nd:YAG laser, and then was tensile tested at 400°C. The effects of the high-temperature behavior after LSP were analyzed from residual stress and fracture organization. The results showed that the yield strength and tensile strength of heat-resistant steel after aluminized were improved obviously during the tensile testing at high temperature, and the High-temperature fatigue life of 00Cr12 with composite processing was enhanced vastly. Compared with the LSP, the High-temperature fatigue life of 00Cr12 heat-resistant steel by aluminizing and LSP had a larger increase.

Effect of Al on the Microstructure and Mechanical Properties of HK40 Heat-Resistant Steel at High Temperature

2016 ◽  
Vol 849 ◽  
pp. 542-548
Author(s):  
Yan Zhang ◽  
Yu Fei Mei ◽  
Ning Zhou ◽  
Zheng Qin Liu ◽  
Yu Fu Sun
Keyword(s):  
Mechanical Properties ◽  
Electron Microscope ◽  
High Temperature ◽  
Solution Treatment ◽  
Resistant Steel ◽  
Heat Resistant Steel ◽  
Al Content ◽  
Heat Resistant ◽  
High Temperature Mechanical Properties ◽  
Transmission Electron

The high-temperature mechanical properties and microstructure of HK40 heat-resistant steel with different content of Al were investigated. The results from scanning electron microscope and transmission electron microscope showed that a large amount of spheroidal and dispersed γ′ phase were observed HK40 steel with 4.72wt.% and 7.10wt.% Al. The diameter of γ′ phase decreases from about 1.5μm to 50nm after solution treatment of 1200°C for 5h. The results of short term tensile test showed that tensile strength at 900°C decreased and the elongation was improved with increasing Al content. The oxides in the alloy with 4.72wt.% and 7.10wt.% Al were more uniform and finer than that in the alloy with and without 1.68wt.% Al.

Study on the High Temperature Creep Behavior of 30Cr25Ni20 Heat-Resistant Steel

2019 ◽  
Vol 814 ◽  
pp. 157-162
Author(s):  
You Yang ◽  
Xiao Dong Wang ◽  
Wei Feng Tang
Keyword(s):  
High Temperature ◽  
Internal Structure ◽  
Creep Strain ◽  
High Temperature Creep ◽  
Resistant Steel ◽  
Heat Resistant Steel ◽  
Creep Fracture ◽  
Heat Resistant ◽  
Temperature Creep ◽  
Before And After

The high temperature creep test of heat-resisting steel 30Cr25Ni20 for automobile exhaust manifolds was carried out, and the creep strain-time curves at 650°C and 700°C in the different loads were obtained. The effects of different creep temperature and stress on creep life of materials were studied. The microstructure of the fracture after creep was observed by scanning electron microscopy. Microstructures before and after creep at different temperatures were compared by optical microscopy. The results show that the creep fracture life of heat-resistant steel decreases with the increase of stress at the same temperature. The creep fracture life decreases with the increase of temperature at the same stress, too. The fracture of heat-resistant steel shows good high temperature plasticity and a ductile fracture after creep. The fracture dimples become deeper with the increase of stress. At 650°Cand 700°C, the stress exponent is 8.6 and 6, respectively. When the sample was subjected to high temperature creep at 700°C, the precipitates increase obviously and the reticular structure became very large. At this point, the internal structure of the material is destroyed, and the matrix structure becomes unevenly distributed. The failure of the internal structure leads to the dramatic increase of the creep strain, and the failure of the internal structure will be more serious with the deformation of the sample.

High-Temperature Oxidation Behaviors of 30Cr25Ni20Si Heat-Resistant Steel in Air

2020 ◽  
Vol 861 ◽  
pp. 83-88
Author(s):  
You Yang ◽  
Xiao Dong Wang
Keyword(s):  
High Temperature ◽  
Oxide Film ◽  
High Temperature Oxidation ◽  
Film Growth ◽  
Surface Oxidation ◽  
Mass Gain ◽  
Resistant Steel ◽  
Temperature Oxidation ◽  
Heat Resistant Steel ◽  
Heat Resistant

High temperature oxidation dynamic behaviors and mechanisms for 30Cr25Ni20Si heat-resistant steel were investigated at 800, 900 and 1000°C. The oxide layers were characterized by scanning electron microscopy (SEM-EDS), X-ray diffractometer (XRD). The results showed that the oxidation rate of test alloys is increased with increasing the oxidation time. The oxidation dynamic curves at 800 and 900°C follow from liner to parabolic oxidation law. The transition point is 10 h. At 1000°C, the steel exhibits a catastrophic oxidation, and the oxidation mass gain value at 50 h is 0.77 mg/cm2. This suggests that the steel at 900°C has formed a dense protective surface oxidation film, effectively preventing the diffusion of the oxygen atoms and other corrosive gas into the alloy. Therefore, at the first stage of oxidation, chemical adsorption and reaction determine the oxide film composition and formation process. At the oxide film growth stage, oxidation is controlled by migration of ions or electrons across the oxide film. When the spinel scale forms, it acts as a compact barrier for O element and improving the oxidation resistance.

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