scholarly journals Effects of Fine Particle Peening on Fatigue Properties of TRIP-Aided Bainitic Ferrite Steel

2015 ◽  
Vol 64 (8) ◽  
pp. 620-627 ◽  
Author(s):  
Masahiro NATORI ◽  
Yuta MIZUNO ◽  
Sung-moo SONG ◽  
Koh-ichi SUGIMOTO
Keyword(s):  
Fine Particle ◽  
Bainitic Ferrite ◽  
Fatigue Properties ◽  
Ferrite Steel

Effect of Fine-Grained Microstructure Induced by Induction-Heating Fine Particle Peening Treatment on Fatigue Properties of Structural Steel (0.45%C)

2014 ◽  
Vol 891-892 ◽  
pp. 1482-1487
Author(s):  
Kazue Murai ◽  
Ryota Toyama ◽  
Jun Komotori ◽  
Kengo Fukazawa ◽  
Yoshitaka Misaka ◽  
...  
Keyword(s):  
Residual Stress ◽  
Fatigue Strength ◽  
Structural Steel ◽  
Grain Refinement ◽  
Induction Heating ◽  
Fine Particle ◽  
Optical Microscope ◽  
Treatment Temperature ◽  
Fatigue Properties ◽  
Fine Grained

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.

scholarly journals Effect of Carbon Content and Intercritical Annealing on Microstructure and Mechanical Tensile Properties in FeCMnSiCr TRIP-Assisted Steels

Metals ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 1546
Author(s):  
Enzo Tesser ◽  
Carlos Silva ◽  
Alfredo Artigas ◽  
Alberto Monsalve
Keyword(s):  
Carbon Content ◽  
Retained Austenite ◽  
Volume Fraction ◽  
Intercritical Annealing ◽  
Bainitic Ferrite ◽  
Ferrite Matrix ◽  
Polygonal Ferrite ◽  
Isothermal Treatment ◽  
Ferrite Steel ◽  
Mechanical Tensile

Four TRIP (Transformation Induced Plasticity) assisted steels, three TBF (TRIP Bainitic Ferrite) steels and one TPF (TRIP Polygonal Ferrite) steel, were manufactured from three different carbon contents (0.2, 0.3 and 0.4 wt.% C), to study the evolution of their microstructure and tensile mechanical properties in 15 mm thick plates. TBF steels were subjected to the same austenitization heat treatment and subsequent bainitization isothermal treatment. The TPF steel was subjected to an intercritical annealing and subsequent isothermal bainitization treatment. All were microstructurally characterized by optical, scanning electron and atomic force microscopy, as well as X-ray diffraction. Mechanically, they were characterized by the ASTM E8 tensile test and fractographies. For the TBF steels, the results showed that when the carbon content increased, there were an increase in volume fraction of retained austenite, of the microconstituent “martensite/retained austenite” and in the tensile strength; and a decrease in the volume fraction of bainitic ferrite matrix and elongation; with an improvement in TRIP behavior due to the increase in retained austenite. The TPF steel presented around 50% ductile polygonal ferrite developing better TRIP behavior than the TBF steels. The evolution of the fractographies was ductile to brittle for TBF steels with an increase in carbon content, and for TPF, the appearance of the fracture surface was ductile.

Effects of Fine Particle Shot Peening Treatment on Fatigue Properties of Al-7Si-0.3Mg Alloy

2019 ◽  
Vol 28 (5) ◽  
pp. 2600-2609 ◽  
Author(s):  
Ming-Ze Wu ◽  
Ji-Wang Zhang ◽  
Gui-Ming Mei ◽  
Jin-Xin Zhang ◽  
Xing Li
Keyword(s):  
Shot Peening ◽  
Fine Particle ◽  
Fatigue Properties
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