Effect of aging temperature and martensite by volume on strain aging behaviour of dual phase steel

Gündüz, Süleyman; Demir, Bilge; Kaçar, Ramazan

doi:10.1179/174328107x203949

Cited by 21 publications

(10 citation statements)

References 25 publications

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“…The higher ductility in steels with fibrous morphology is also related to the nucleation, growth and coalescence of microvoids; the reason for the higher ductility of specimens with fibrous martensite morphology compared to specimens with network or coarse, blocky martensite may also be explained by the presence of a higher potential of microvoid formation sites, as suggested by Gü ndü z et al 28 There could be a greater number of martensite particles per unit volume and therefore more microvoid nucleation sites in specimens with fibrous martensite morphology. Among the different specimens, the fibrous morphology clearly shows the most attractive combination of strength and ductility compared to specimens with networked or coarse, blocky martensite after aging for different time periods (see Table 1 and Fig.…”

Section: Mechanical Propertiesmentioning

confidence: 85%

Martensite morphology and strain aging behaviours in intercritically treated low carbon steel

Türkmen

Gündüz

2011

Ironmaking & Steelmaking

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The strain aging behaviour of intercritically annealed low carbon steel with different martensite morphologies has been investigated. Aging experiments after 4% prestrain were carried out at 180uC for different times ranging from 10 to 160 min. It was found that the variation in bake hardening response DY, lower yield stress and ultimate tensile stress with aging time describes a similar trend for all three microstructural variants, but the absolute values of bake hardening response, lower yield stress and ultimate tensile stress are higher for the microstructure containing fibrous, more uniformly distributed martensite. The aging response of fibrous martensite was also found to be slower, and the fibrous martensite morphology provided the best combination of strength and ductility as desired for dual phase steels.

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Section: Mechanical Propertiesmentioning

confidence: 85%

Martensite morphology and strain aging behaviours in intercritically treated low carbon steel

Türkmen

Gündüz

2011

Ironmaking & Steelmaking

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“…At even higher temperature, however, R p0. 2 and R m decrease due to softening caused by tempering of the martensite phase [8].…”

Section: Introductionmentioning

confidence: 98%

The influence of temperatures and strain rates on the mechanical behavior of dual phase steel in different conditions

Cao

Ahlström

Karlsson

2015

Journal of Materials Research and Technology

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j m a t e r r e s t e c h n o l . 2 0 1 5;4(1):68-74 w w w . j m r t . c o m . b r Dual phase steel Tensile properties Ductility Strain rate sensitivity Strain hardening a b s t r a c tThis study deals with the mechanical behavior of DP steel. A commercial dual phase steel (DP 800) was strained to 3.5% followed by annealing at 180 • C for 30 min to simulate the pressing of the plates and the paint-bake cycle involved in the manufacturing process of automobile body structures. The effect of temperature and strain rate on the mechanical behavior of this material was investigated by uniaxial tensile tests, covering applicable temperatures (−60 • C to 100 • C) and strain rates (1 × 10 −4 to 1 × 10 2 s −1 ) experienced in automotive crash situations. Yield and ultimate tensile strength, ductility, temperature effects and strain rate sensitivity as well as strain hardening rate have been determined and discussed.

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“…Gündüz vd. [10] yaptıkları çalışmada, çift fazlı çeliklerin farklı sıcaklıklarda yaşlandırılmaları sonrası mekanik özelliklerini incelemişlerdir. Akma ve çekme değerlerinin 200 °C yaşlanma sıcaklığına kadar arttığını, bu değerlerin 250 °C'de yaşlanma sıcaklığın ile azaldığını belirtilmiştir.…”

Section: The Effect Of Double Strain Aging On the Mechanical Propertiunclassified

DP600 Çeliğinin Mekanik Özelliklerine Çift Gerinim Yaşlanma İşleminin Etkisi

Topbaşoğlu

Dinler

Kaya

et al. 2020

Gazi Üniversitesi Fen Bilimleri Dergisi Part C: Tasarım Ve Teknoloji

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In this study, the effect of double strain aging behavior in DP600 steels was investigated. After strain aging in DP600 steels; microstructure, hardness, fractured surface and tensile properties were investigated . Figure A. Schematic representation of the strain aging processPurpose: The aim of this study is to investigate the effect of double strain aging behavior on mechanical properties in commercial DP600 steels.Theory and Methods: Specimens with single strain aging were statically aged for 30 and 60 minutes at temperatures of 140 °C and 190 °C after 2% prestrain. As a result of aging at 140 °C for 60 minutes, continuous yield behavior has been preserved, but discontinuous yield behavior has been observed at 190 °C. After aging the samples with 2% pre-strain for 30 minutes at 140 °C and 190 °C, second strain for 3% was applied and re-aging was performed at the same temperatures.Results: While yield and tensile strength, hardness increased, uniform elongation and strain hardening exponent decreased at all temperatures. Continuous yield behavior was observed after 30 minutes at both ageing temperatures. It was determined that the yield and tensile strength and hardness of 30 minutes aged samples were higher than the 60 minutes aged sample, but the elongation (%) and strain hardening exponent values decreased. Conclusion:Studies have shown that the results of double strain aging behavior at DP600 steels are compatible the mechanical tests.

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Effect of aging temperature and martensite by volume on strain aging behaviour of dual phase steel

Cited by 21 publications

References 25 publications

Martensite morphology and strain aging behaviours in intercritically treated low carbon steel

Martensite morphology and strain aging behaviours in intercritically treated low carbon steel

The influence of temperatures and strain rates on the mechanical behavior of dual phase steel in different conditions

DP600 Çeliğinin Mekanik Özelliklerine Çift Gerinim Yaşlanma İşleminin Etkisi

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