Acoustic Emission Technique to Study the Effect of Strain Rate on the Deformation Behaviour of TRIP Aided Steels with Different Matrix Microstructures

Mukherjee, Madhumita; Mohanty, O. N.; Hashimoto, Seiya; Hojo, Tomohiko; Sugimoto, Koh Ichi

doi:10.2355/isijinternational.46.1241

Cited by 14 publications

(4 citation statements)

References 28 publications

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“…13,17,18) In this study, we investigated the high-speed tensile deformation behavior and the strain rate dependencies of tensile properties of TRIP steel with 1 GPa-grade tensile strength. We also focused on the effect of γ R morphology on the tensile properties of high-strength TRIP steel, which is related to the study by Mukherjee et al 19,20) The characteristics, potential, and drawbacks of the high-strength TRIP steel investigated in this study are discussed by comparing the obtained results to those previously reported for various steels.…”

Section: Introductionmentioning

confidence: 83%

“…This study focuses on high-strength TRIP steel with 1 GPa-grade tensile strength. Mukherjee et al 19,20) reported a 1 GPa class high-strength TRIP steel manufactured from 0.4 C steel, focusing on the effect of the matrix on the mechanical properties of TRIP steel. They manufactured TRIP steels from the same chemical composition but with different matrixes, conducted tensile tests under strain rates ranging from 3.33 × 10 −5 to 3.33 × 10 −2 s −1 at room temperature to 423 K. They discussed the relationship between the mechanical properties and changes in the deformationinduced transformation behavior with temperature and strain rate.…”

Section: Introductionmentioning

confidence: 99%

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High-speed Tensile Deformation Behavior of 1 GPa-grade TRIP-aided Multi-phase Steels

Tsuchida

Satoshi

Tanaka³

et al. 2018

ISIJ Int.

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High-speed deformation behavior and strain rate dependency of mechanical properties of 1 GPa-grade TRIP-aided multi-phase (TRIP) steels were studied. The strain rate range in this study was between 3.3 × 10 − 6 and 10 3 s − 1 , and the effect of retained austenite (γ R) shapes on TRIP effect in the 1 GPa-grade TRIP steel was also focused on. The effects of strain rate on tensile strength and flow stress in the TRIP steels were small whereas that on uniform elongation was large. The strain rate dependencies of tensile strength and uniform elongation in the TRIP steels were more closely to those of the metastable austenitic stainless steels than the conventional TRIP and dual-phase steels. The 1 GPa-grade TRIP steel with the γ R shape of needle-like showed better tensile properties and absorbed energy in the present strain rate range. The volume fraction of γ R more than 20% and the matrix microstructure of martensite seem to be important factors in the high-strength TRIP steels.

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Section: Introductionmentioning

confidence: 83%

Section: Introductionmentioning

confidence: 99%

High-speed Tensile Deformation Behavior of 1 GPa-grade TRIP-aided Multi-phase Steels

Tsuchida

Satoshi

Tanaka³

et al. 2018

ISIJ Int.

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“…Acoustic emission (AE) measurements were performed using an AE sensor with an operating frequency range of 100 to 1 000 kHz, a wideband differential piezo-electric transducer (WD, diameter of 18 mm, threshold amplitude of 30 dB). 14) For the root mean square (RMS) voltage of AE waves, the time constant was set to 0.8 s. Figure 2 shows the SEM images of the steel sheets used. The microstructure of Fig.…”

Section: Methodsmentioning

confidence: 99%

Spot-Welded Tensile Properties in Automobile Ultrahigh-Strength TRIP-Aided Martensitic Steel Sheet

et al. 2021

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Effect of heat-affected zone (HAZ) softening on tensile strength (TS) and total elongation (TEl) of spotwelded automobile ultrahigh strength TRIP-aided martensitic (TM) steel sheet was investigated for automobile applications. Tensile test was performed on an Instron type tensile testing machine at a crosshead speed of 3 mm/min (strain rate of 8.3 × 10 − 4 s − 1), using spot-welded specimen. The results are as follows. (1) The spot-welded specimen at the current value (I) of 6.5 kA for the TM steel with the maximum tensile stress (TS *) of 1 450 MPa and the fracture elongation (TEl *) of 7.0% was superior to that of hot stampted (HS1) steel sheet and it was found that the TS * and the TEl * for the TM steel possessed same level as those of base metal specimen for the HS1 steel with the tensile strength (TS) of 1 469 MPa and the total elongation (TEl) of 7.7%. (2) The TRIP effect for the TM steel with an excellent strength-ductility balance (TS × TEl) of 14.4 GPa% (i.e. the tensile strength (TS) of 1 532 MPa and the total elongation (TEl) of 9.4%) suppressed the HAZ softening and was able to express a high maximum stress (TS *) of 1 450 MPa of the spot-welded specimen for the TM steel.

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“…This steel contains less carbon than Si-alloy steel. By mass balance, the carbon content of the Alalloyed retained austenitic steel is lower, meaning that it reduces the stability of austenite during deformation (i.e., leads to almost complete transformation to martensite at low levels of deformation) and also reduces uniform elongation [66,67]. In the case of Al-alloy steel, the melting zone shows small changes in elongation.…”

Section: Weldability Of Progressive Steel Sheets For the Automotive Imentioning

confidence: 99%

Properties Evaluation of the Welded Joints Made by Disk Laser

et al. 2021

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The process of laser welding of sheets of HSLA (high-strength low-alloy steel), DP600 (dual-phase steel) and TRIP steels was investigated. A weld was successfully made in a double-sided hot-dip galvanized sheet with a thickness of 0.78–0.81 mm using a laser power of 2 kW per pass without any pretreatment of the weld zone. Microstructure studies revealed the presence of martensitic and ferritic phases in the weld zone, which could be associated with a high rate of its cooling. This made it possible to obtain good strength of the weld, while maintaining sufficient ductility. A relationship between the microstructural features and mechanical properties of welds made in the investigated steels has been established. The highest hardness was found in the alloying region of steels due to the formation of martensite. The hardness test results showed a very narrow soft zone in the heat affected zone (HAZ) adjacent to the weld interface, which does not affect the tensile strength of the weld. The ultimate tensile strength of welds for HSLA steel was 340–450 MPa, for DP600 steel: 580–670 MPa, for TRIP steel: ~700 MPa, respectively, exceeding the strength of base steels.

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Acoustic Emission Technique to Study the Effect of Strain Rate on the Deformation Behaviour of TRIP Aided Steels with Different Matrix Microstructures

Cited by 14 publications

References 28 publications

High-speed Tensile Deformation Behavior of 1 GPa-grade TRIP-aided Multi-phase Steels

High-speed Tensile Deformation Behavior of 1 GPa-grade TRIP-aided Multi-phase Steels

Spot-Welded Tensile Properties in Automobile Ultrahigh-Strength TRIP-Aided Martensitic Steel Sheet

Properties Evaluation of the Welded Joints Made by Disk Laser

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