Fatigue Strength of Structural Steel DAN400 Plate Produced by Thermomechanical Treatment Technology with Accelerated Cooling

Metallurgist ◽  
2021 ◽  
Vol 64 (11-12) ◽  
pp. 1264-1269
Author(s):  
E. A. Goli-Oglu ◽  
O. I. Sarkits ◽  
E. I. Mansyrev ◽  
D. E. Mansyrev
2020 ◽  
Vol 72 (1) ◽  
pp. 2-20

The article presents the results of studies on the impact of accelerated cooling after the austenitisation of bars with a diameter of 180 mm made of structural steel S355J2 on the microstructure and mechanical properties. The aim of the research was to develop basic parameters of heat treatment technology using the heat remaining in the bars after hot rolling. Tests of heating and cooling of the bars were carried out in devices included in the line for semi-industrial hot rolling simulation, controlled cooling and heat treatment (LPS-B) at Łukasiewicz – IMŻ. The following cooling operations were performed after bar austenitisation: cooling in still air, controlled cooling with air blow, water-air mixture, water spraying and immersion cooling in water. Based on the research and analyses, it was found that the use of optimised variants of accelerated cooling leads to the modification of the microstructure and to grain refinement, without the formation of undesirable phase components. Consequently, the mechanical properties (yield strength and impact toughness) increase above the level obtained as a result of cooling in still air, including standard normalisation. Preliminary tests of accelerated air stream cooling of bars were carried out after austenitising in industrial conditions. The final criterion for selecting and implementing the type of technology for heat treatment of bars using heat after hot rolling in Huta Bankowa’s technical and technological conditions will be the assessment of the economic efficiency of the project.


1999 ◽  
Vol 13 (5) ◽  
pp. 385-391
Author(s):  
Y Kobayashi ◽  
Y Tanaka ◽  
H Goto ◽  
K Matsuoka ◽  
Y Motohashi

1976 ◽  
Vol 7 (5) ◽  
pp. 761-762 ◽  
Author(s):  
Farhad Mehrpay ◽  
David L. Kudsin ◽  
W. L. Haworth

2015 ◽  
Vol 15 (3) ◽  
pp. 33-40
Author(s):  
T. Lipiński ◽  
A. Wach ◽  
E. Detyna

Abstract The article discusses the effect of large oxide impurities (a diameter larger than 10 μm in size) on the fatigue resistance of structural steel of high purity during rotary bending. The study was performed on 7 heats produced in an industrial plant. The heats were produced in 140 ton electric furnaces. All heats were desulfurized. The experimental material consisted of semi-finished products of high-grade, carbon structural steel with: manganese, chromium, nickel, molybdenum and boron. Steel sections with a diameter of 18 mm were hardened from austenitizing by 30 minutes in temperature 880°C and tempered at a temperature of 200, 300, 400, 500 and 600°C for 120 minutes and air-cooled. The experimental variants were compared in view of the heat treatment options. Fatigue tests were performed with the use of a rotary bending machine at a frequency of 6000 cpm. The results were statistical processed and presented in graphic form. This paper discusses the results of the relative volume of large impurities, the fatigue strength for various heat processing options.


1983 ◽  
Vol 1983 (337) ◽  
pp. 67-74 ◽  
Author(s):  
Kentaro YAMADA ◽  
Makoto MURAYAMA ◽  
Akimasa KONDO ◽  
Yoichi KIKUCHI

2014 ◽  
Vol 891-892 ◽  
pp. 1482-1487
Author(s):  
Kazue Murai ◽  
Ryota Toyama ◽  
Jun Komotori ◽  
Kengo Fukazawa ◽  
Yoshitaka Misaka ◽  
...  

To improve the fatigue properties of structural steel, a novel surface modification process which combines high-frequency induction heating (IH) with fine particle peening (FPP) was developed. IH-FPP treatment was performed on the surface of structural steel specimens (0.45%C) at temperatures from 600 to 750 °C, with peening times of 60 and 120 s. To determine the characteristics of the treated surfaces, the microstructure was observed using an optical microscope and a scanning electron microscope. Vickers hardness and residual stress distributions were also measured. The characteristics of fine-grained microstructures were examined by electron backscatter diffraction. Furthermore, in order to investigate the effect of the grain refinement achieved by IH-FPP treatment, rotational bending fatigue tests were performed on treated specimens. Results showed that IH-FPP treatment created fine-grained microstructures beneath the surfaces of steel samples. The average ferrite grain size was 4.06 μm for a treatment temperature of 700 °C, and finally 0.76 μm for 600 °C . This was due to dynamic recrystallization in the processed region. IH-FPP treated specimens exhibited a higher fatigue strength than untreated specimens. As almost no compressive residual stress was measured in the treated or untreated specimens, the increase in fatigue strength resulting from IH-FPP treatment was due solely to grain refinement.


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