Delaminating Crack Paths in Ultrafine, Elongated Ferritic Steel

Wang, Chengduo; Qiu, Hai; Inoue, Tatsuo

doi:10.2355/isijinternational.53.2272

Cited by 8 publications

(5 citation statements)

References 21 publications

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“…Specimens of 10 mm × 10 mm × 3 mm were machined from the heat-treated samples and polished to obtain a damage-free surface suitable for the EBSD measurements. The procedure was described in detail elsewhere [35]. The microstructure was examined using EBSD in a FE-SEM instrument (Zeiss LEO 1550, Zeiss, Oberkochen, Germany) equipped with the TexSEM Laboratories (TSL) system.…”

Section: Methodsmentioning

confidence: 99%

Morphology and Crystallography of Ausferrite in Austempered Ductile Iron

Wang

et al. 2017

Metals

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The microstructure of austempered ductile iron was investigated by electron backscatter diffraction technique. The results show that the orientation relationship between acicular bainitic ferrite and austenite is Greninger-Troiano relationship. A single austenite grain is divided into four packets and each packet contains six variants that share a {011} α (i.e., {111} γ) plane. When two γ grains are twinned, the twins share a {111} γ plane and have seven packets. The adjacent acicular bainitic ferrite plates (or laths) sharing a 001 γ axis have small misorientation of about 5.7 •. The adjacent acicular bainitic ferrite plates (or laths) not sharing a 001 γ axis have two high misorientation angles of~54.3 • and~60.0 •. Further, the low angle boundary to high angle boundary ratio is far less than the ratio of the variant pairs with small misorientation to the ones with large misorientation. This work is available for structures obtained as a consequence of the heat treatment of austempering.

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Section: Methodsmentioning

confidence: 99%

Morphology and Crystallography of Ausferrite in Austempered Ductile Iron

Wang

et al. 2017

Metals

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“…Since 2000, Japanese researchers have found that a bar with a fibrous microstructure has remarkable delamination toughening phenomenon. [1][2][3] For example, Kimura et al made a Fe-0.4C-2Si-1Cr-1Mo steel with a fibrous and ultrafine-grained microstructure by warm caliber rolling. The tensile strength was 1,850 MPa, and the Charpy V-notch impact toughness (CVN) was up to 290 J at À60 °C.…”

Section: Introductionmentioning

confidence: 99%

Relationship Between Microstructure, Delamination Behavior, and Toughness of Steel Plates Rolled in the Intercritical Region Under Variable Deformation

Shen

Wang

Chen

et al. 2023

steel research int.

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“…[3] Compared with the TMCP and SPD methods, imposing deformation to the quenched martensite during tempering, i.e., tempforming, is a new strategy that can produce high-strength and tough steels with lean compositions. [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22] The microstructure obtained by tempforming contains fibrous grains decorated with nano-sized carbides. The diameter of fiber grains can be reduced to hundreds of nanometers, which offers a unique strategy to produce steels with high yield stress and excellent toughness.…”

Section: Introductionmentioning

confidence: 99%

“…[4][5][6][7] To date, numerous studies are devoted to investigate the effect of forming temperature, area reduction rate, and the addition of a small amount of alloying element on the strength and toughness of steels after tempforming. [8][9][10][11][12][13][14][15][16][17][18][19][20][21][22] Energy consumption is the other unavoidable consideration for the development of advanced engineering materials. In this study, for the first time, tempforming process was directly employed in the commercial hot-rolled and air-cooled low-alloyed steels.…”

Section: Introductionmentioning

confidence: 99%

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Strengthen and Toughen the Low‐Alloyed Steel by Direct Tempforming

et al. 2022

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Improving strength without sacrificing toughness is a permanent request for the development of advanced engineering materials. Herein, a novel energy‐saving strategy is developed to obtain strong but tough low‐alloyed steels. A medium‐carbon steel (42CrMo) is used for demonstration. Warm deformation (tempforming) is applied to the hot‐rolled and air‐cooled 42CrMo steel. After tempforming, the microstructure consists of nano‐sized carbides and highly textured ultrafine grains. The tensile strength of the tempformed steels can reach 1.2 GPa, while the impact toughness is higher than 100 J even at temperatures as low as −80 °C, which are one order of magnitude higher than the counterpart steel after tempering. The present work sheds light on the design and fabrication of high‐performance engineering steels with an excellent combination of strength and toughness.

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Delaminating Crack Paths in Ultrafine, Elongated Ferritic Steel

Cited by 8 publications

References 21 publications

Morphology and Crystallography of Ausferrite in Austempered Ductile Iron

Morphology and Crystallography of Ausferrite in Austempered Ductile Iron

Relationship Between Microstructure, Delamination Behavior, and Toughness of Steel Plates Rolled in the Intercritical Region Under Variable Deformation

Strengthen and Toughen the Low‐Alloyed Steel by Direct Tempforming

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