Cold Formability of 22SiMnCrB TRIP-aided Martensitic Sheet Steel

Kobayashi, Junya; Tonegawa, Hiroki; Sugimoto, Koh‐ichi

doi:10.1016/j.proeng.2014.10.153

Cited by 10 publications

(9 citation statements)

References 8 publications

(10 reference statements)

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“…It is also considered that the decrease in the M S temperature delays the martensite transformation at quenching, and increases the amount of the M-A phase. The mechanism of such a microstructural change of the TM steels owing to the addition of alloying elements has been reported in previous reports [12,20,21].…”

Section: Improvement Of Hydrogen Embrittlement Properties By Refinemesupporting

confidence: 52%

Effects of Alloying Elements Addition on Delayed Fracture Properties of Ultra High-Strength TRIP-Aided Martensitic Steels

Hojo

Kobayashi

Sugimoto

et al. 2019

Metals

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To develop ultra high-strength cold stamping steels for automobile frame parts, the effects of alloying elements on hydrogen embrittlement properties of ultra high-strength low alloy transformation induced plasticity (TRIP)-aided steels with a martensite matrix (TM steels) were investigated using the four-point bending test and conventional strain rate tensile test (CSRT). Hydrogen embrittlement properties of the TM steels were improved by the alloying addition. Particularly, 1.0 mass% chromium added TM steel indicated excellent hydrogen embrittlement resistance. This effect was attributed to (1) the decrease in the diffusible hydrogen concentration at the uniform and fine prior austenite grain and packet, block, and lath boundaries; (2) the suppression of hydrogen trapping at martensite matrix/cementite interfaces owing to the suppression of precipitation of cementite at the coarse martensite lath matrix; and (3) the suppression of the hydrogen diffusion to the crack initiation sites owing to the high stability of retained austenite because of the existence of retained austenite in a large amount of the martensite–austenite constituent (M–A) phase in the TM steels containing 1.0 mass% chromium.

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Section: Improvement Of Hydrogen Embrittlement Properties By Refinemesupporting

confidence: 52%

Effects of Alloying Elements Addition on Delayed Fracture Properties of Ultra High-Strength TRIP-Aided Martensitic Steels

Hojo

Kobayashi

Sugimoto

et al. 2019

Metals

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“…A volume fraction and stability of retained austenite are essential factors in designing TRIP steels. Numerous reports concern the stability of retained austenite in TRIP-assisted multiphase steels [3,4,6,26,27]. Nowadays, researchers are focused on C-Mn-Si-Al TRIP steels with microadditions such as Nb, Ti, and Mo [4,8,[17][18][19][20][21]28].…”

Section: Discussionmentioning

confidence: 99%

“…This enables predicting optimal mechanical properties of final products and monitoring the amount of available retained austenite in crash events. The experimental analysis of microstructural changes during straining was reported mostly for cold-rolled TRIP steels [1,3,4]. Several models describing the kinetics of strain-induced transformation of retained austenite in TRIP steels have been also developed [5].…”

Section: Introductionmentioning

confidence: 99%

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Quantitative Analysis of Microstructure Evolution in Hot-Rolled Multiphase Steel Subjected to Interrupted Tensile Test

Grajcar

Kozłowska

Radwański

et al. 2019

Metals

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A quantitative analysis of the microstructure evolution in thermomechanically processed Si-Al multiphase steel with Nb and Ti microadditions was performed in the study. The tendency of strain-induced martensitic transformation of retained austenite was analyzed during a tensile test interrupted at incremental strain levels. Optical micrographs and electron backscatter diffraction (EBSD) maps were obtained at each deformation step. The quantitative analysis of the martensitic transformation progress as a function of strain was performed. The results showed that the stability of retained austenite is mostly related to its grain size and morphology. Large, blocky-type grains of retained austenite located in a ferritic matrix easily transformed into martensite during an initial step of straining. The highest mechanical stability showed small austenitic grains and thin layers located in bainitic islands. It was found that the extent of martensitic transformation decreased as the deformation level increased.

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“…6) Since the edge of the hole is severely deformed by punching, the micro voids which are generated by punching are considered to greatly deteriorate the hole expanding ratio. [14][15][16][17] To explain the result in Fig. 5, the microstructures in the cross-sections of the punched edge were observed.…”

Section: Effects Of Volume Fraction Of Martensite On Holementioning

confidence: 99%

Void Generation in Cold-rolled Dual-Phase Steel Sheet Having Excellent Stretch Flange Formability

Takashima¹,

Hasegawa²,

Toji³

et al. 2017

ISIJ International

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The aim of this research is to investigate generation of micro voids affecting stretch flange formability in cold-rolled Dual-Phase (DP) steel sheets having a low volume fraction of martensite. The volume fraction of martensite was the dominant factor of the hole expanding ratio instead of the difference in hardness between ferrite and martensite when the difference in hardness between ferrite and martensite was large. On the other hand, the difference in hardness became the dominant factor of the hole expanding ratio in DP steel sheets having a low difference in hardness. Micro voids around the punched hole and the fracture edge of tensile deformation were observed in order to understand these different results. The void density is able to be associated with the hole expanding ratio under the same strain condition and the void density depends on the martensite spacing.

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Cold Formability of 22SiMnCrB TRIP-aided Martensitic Sheet Steel

Cited by 10 publications

References 8 publications

Effects of Alloying Elements Addition on Delayed Fracture Properties of Ultra High-Strength TRIP-Aided Martensitic Steels

Effects of Alloying Elements Addition on Delayed Fracture Properties of Ultra High-Strength TRIP-Aided Martensitic Steels

Quantitative Analysis of Microstructure Evolution in Hot-Rolled Multiphase Steel Subjected to Interrupted Tensile Test

Void Generation in Cold-rolled Dual-Phase Steel Sheet Having Excellent Stretch Flange Formability

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