Bainite Transformation and Resultant Tensile Properties of 0.6%C Low Alloyed Steels with Different Prior Austenite Grain Sizes

Ueji, Rintaro; Kimura, Yuuji; Ushioda, Kohsaku; Ohmura, Takahito; Inoue, Tatsuo

doi:10.2355/isijinternational.isijint-2020-389

Cited by 14 publications

(10 citation statements)

References 51 publications

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“…The reason for the choice of this steel is that several studies have already evaluated the mechanical properties of this steel with different microstructures such as tempered martensite, 30) deformed martensite 30) and bainite. 31,32) Some of these data enable the comparison to reveal the microstructural effect on the HE. The round bar with a dimension of 40 mm diameter × ~100 mm length was austenitized at 1 123 K for 1.8 ks followed by air cooling to obtain fully pearlite structure.…”

Section: Methodsmentioning

confidence: 99%

Preferable Resistance against Hydrogen Embrittlement of Pearlitic Steel Deformed by Caliber Rolling

2022

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High strengthened steel bar with elongated pearlite was prepared by caliber rolling at room temperature and its hydrogen embrittlement was studied. A 0.6%C -2%Si -0.2%Mn -1%Cr (in mass%) steel was caliber rolled to a reduction of area of 88%, resulting in the evolution of the elongated lamellar structure similar to those in cold drawn pearlitic steel. Mean lamellar spacing of the elongated pearlite was 70 nm and the texture of the rolled steel consisted of strong fiber texture with the rolling direction parallel to < 110 > . The rolled steel exhibited high yield strength of 1.4 GPa with large reduction of area at fracture (51%). It was demonstrated by both conventional and slow strain tensile tests (CSRT and SSRT) with circumferentially-notched bar specimens that the rolled steel with elongated pearlite performed higher resistance to hydrogen embrittlement than other thermo-mechanically treated steels in which fundamental microstructure is martensite. The possible mechanism for this desirable property is discussed with linking between the cracking path and the significant characters of the microstructure such as anisotropic morphology of lamellar structure and crystallographic texture.

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Section: Methodsmentioning

confidence: 99%

Preferable Resistance against Hydrogen Embrittlement of Pearlitic Steel Deformed by Caliber Rolling

2022

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“…According to recent research, a combination of bainite and retained austenite (RA) can achieve good strength-toughness combination. [23][24][25][26][27][28][29][30] As a metastable phase in steel, RA can significantly affect the material's mechanical properties, including hardening and fatigue behavior. 31,32 By adding a certain amount of austenite stabilizers, such as Si, Mn, Cr, and Ni, it becomes possible for the steel to obtain metastable austenite phase.…”

Section: Introductionmentioning

confidence: 99%

“…According to recent research, a combination of bainite and retained austenite (RA) can achieve good strength–toughness combination 23–30 . As a metastable phase in steel, RA can significantly affect the material's mechanical properties, including hardening and fatigue behavior 31,32 .…”

Section: Introductionmentioning

confidence: 99%

Investigation of retained austenite morphology‐dominated hardening and fatigue behavior in bainitic steel during wear process

Chen,

Huang,

Liao

et al. 2023

Fatigue Fract Eng Mat Struct

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This study aims to revealing the relationship among retained austenite (RA) morphology, deformation‐induced transformation (DIPT) behavior, and surface wear behavior. The hardening and fatigue behavior during wear of continuous film‐like RA (CFRA), blocky RA (BRA), discontinuous film‐like RA (DFRA), and point or flocculent RA (PRA) achieved through different tempering processes was investigated using quasi‐in situ fatigue test and impact abrasive wear test. RA morphology exhibited a significant influence on hardening and fatigue behavior during wear. CFRA exhibited the best wear properties, owing to its excellent fatigue performance and hardening capacity. The BRA displayed relative high wear performance, with adequate hardening capacity but weak fatigue performance. DFRA demonstrated comparable wear resistance to BRA because of better fatigue performance. PRA exhibited deficient wear performance because of insufficient fatigue properties and low work‐hardening ability.

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“…The published data about the tensile strength of the steels with different carbon content are summarized in Fig. 1(b) [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19] . This figure indicates rough tendency that the TRIP aided steel with higher carbon content is useful to obtain the higher tensile strength.…”

Section: Introductionmentioning

confidence: 99%

“…Figure 2 shows the previously published data of the volume fraction of austenite in the various steels 7,10,15,16,[21][22][23][24][25][26] . These data were plotted as a function of strain applied at room temperature.…”

Section: Introductionmentioning

confidence: 99%

Deformation-Induced Martensitic Transformation at Tensile and Compressive Deformations of High-Carbon Bainitic Steel

Shibata¹,

Tsuchida²,

Harjo³

et al. 2023

International Symposium on New Developments in Advanced High-Strength Sheet Steels

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Bainite Transformation and Resultant Tensile Properties of 0.6%C Low Alloyed Steels with Different Prior Austenite Grain Sizes

Cited by 14 publications

References 51 publications

Preferable Resistance against Hydrogen Embrittlement of Pearlitic Steel Deformed by Caliber Rolling

Preferable Resistance against Hydrogen Embrittlement of Pearlitic Steel Deformed by Caliber Rolling

Investigation of retained austenite morphology‐dominated hardening and fatigue behavior in bainitic steel during wear process

Deformation-Induced Martensitic Transformation at Tensile and Compressive Deformations of High-Carbon Bainitic Steel

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