Effect of dislocation density on the low temperature aging behavior of an ultra low carbon bake hardening steel

De, A. K.; Blauwe, Katrien De; Vandeputte, S.; Cooman, Bruno C. De

doi:10.1016/s0925-8388(00)00973-7

Cited by 72 publications

(39 citation statements)

References 10 publications

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“…The homogeneous and heterogeneous distributions of strain are also apparent in the plots shown in Figure 4d-f, where homogeneous straining for 5% and 10% was demonstrated along the gauge lengths and thicknesses, but the non-uniform distribution of strain was observed at the different sections in the sample gauge after strain for 15% at RT. Thus, the results demonstrated a limitation of pre-straining for up to 10% at RT in the present experimental conditions and, more importantly, this limitation in the amount of attainable strain restricts any potential of RT pre-straining for the development of forming techniques, such as bake hardening [14,20] and double thermomechanical treatment [21] of Al 7075 alloy. after strain for 15% at RT.…”

Section: Strain Distribution With Different Strain Levels In Al 7075 mentioning

confidence: 72%

“…after strain for 15% at RT. Thus, the results demonstrated a limitation of pre-straining for up to 10% at RT in the present experimental conditions and, more importantly, this limitation in the amount of attainable strain restricts any potential of RT pre-straining for the development of forming techniques, such as bake hardening [14,20] and double thermomechanical treatment [21] of Al 7075 alloy.…”

Section: Strain Distribution With Different Strain Levels In Al 7075 mentioning

confidence: 72%

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Effects of Pre-Strain on the Aging Behavior of Al 7075 Alloy for Hot-Stamping Capability

Jung

Lee

Kawasaki

2018

Metals

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Abstract:The present study investigates the significance of pre-strain on the T6 aging behavior of an Al 7075 alloy for evaluating the applicability of hot stamping. In practice, the alloy was pre-strained up to 15% during solution heat treatment at 480 • C prior to quenching, and artificial aging was conducted at 120 • C. The peak aging time and precipitation behavior were compared with the alloy with pre-straining at room temperature after quenching but immediately before the artificial aging. The results showed that increasing amounts of pre-strain tend to reduce the aging time up to 50% for achieving peak hardness, which is consistent with the alloy at the T6 condition. There is a limitation for the maximum attainable amount of pre-strain of 10% for the homogeneous distribution of strain when the alloy is strained at room temperature (RT) due to the low formability. The pre-strained alloy as hot stamping exhibited lowering of the peak reaction temperatures for dissolution and formation of Guinier-Preston (GP)-Zones and precipitated with increasing amounts of pre-strain towards 15% through the differential scanning calorimetry analysis, thereby confirming the shortening of the peak aging time. The present study confirms the excellent potential of the hot-stamping process to extend the capability of an Al 7075 alloy.

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Section: Strain Distribution With Different Strain Levels In Al 7075 mentioning

confidence: 72%

Section: Strain Distribution With Different Strain Levels In Al 7075 mentioning

confidence: 72%

Effects of Pre-Strain on the Aging Behavior of Al 7075 Alloy for Hot-Stamping Capability

Jung

Lee

Kawasaki

2018

Metals

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“…The BH kinetics in bainite are much faster, because of the high carbon content and higher dislocation density that reduces the diffusion distance for dislocation pinning by carbon. [13] However, as has been reported, [20] the BH response depends on the formation of mobile dislocations in the strain-aged steels, but the importance of the dislocation rearrangements and their interaction during PS, and the further effect of the BH in the DP and TRIP steels, has not been clearly identified.…”

mentioning

confidence: 93%

Transmission Electron Microscopy Characterization of the Bake-Hardening Behavior of Transformation-Induced Plasticity and Dual-Phase Steels

Timokhina

Hodgson

Pereloma

2007

Metall Mater Trans A

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The effect of prestraining (PS) and bake hardening (BH) on the microstructures and mechanical properties has been studied in transformation-induced plasticity (TRIP) and dual-phase (DP) steels after intercritical annealing. The DP steel showed an increase in the yield strength and the appearance of the upper and lower yield points after a single BH treatment as compared with the as-received condition, whereas the mechanical properties of the TRIP steel remained unchanged. This difference appears to be because of the formation of plastic deformation zones with high dislocation density around the ''as-quenched'' martensite in the DP steel, which allowed carbon to pin these dislocations, which, in turn, increased the yield strength. It was found for both steels that the BH behavior depends on the dislocation rearrangement in ferrite with the formation of cell, microbands, and shear band structures after PS. The strain-induced transformation of retained austenite to martensite in the TRIP steel contributes to the formation of a complex dislocation structure.

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“…This makes the restraining effect of dislocation tangles on bainite formation disappear gradually. Understandably, even if the stayed process after plastic deformation at 850 is not carried out, the micromophology of the sheaf-like bainite formed isothermally at 450 for 30min is similar to that in the samples stayed 100s [8,9]. Fig.4b) it can be determined that the laths shown in the Fig.6(a) are bainitic ferrite.…”

Section: Fig 4 the Xrd Patterns Of Samples Experienced Different Trementioning

confidence: 67%

Research on the Nanobainitic Features Formed in the Ultra-low Carbon Steel Non-Containing Nb and Ti Elements

Liu

Zhang

et al. 2016

MATEC Web Conf.

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Abstract. The XRD analysis, microstructure observation and mechanical test were used to investigate the phase composition, micromorphology and mechanical properties of the intermediate transformation products in an ultra-low carbon steel non-containing Nb and Ti elements. The results showed that even without the presence of Nb and Ti alloy compounds, the experimental steel still exhibited good Rockwell hardness level. When the steels were held for a shorter times at 450 , its Rockwell hardness under stayed 100s after plastic deformation at 850 was higher than that under cooled directly because the 100s-stayed process was benefit to the formation of nanobainite. However, when the steels were held over 30min at 450 , its Rockwell hardness under stayed 100s were close to that of non-stayed steel.

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Effect of dislocation density on the low temperature aging behavior of an ultra low carbon bake hardening steel

Cited by 72 publications

References 10 publications

Effects of Pre-Strain on the Aging Behavior of Al 7075 Alloy for Hot-Stamping Capability

Effects of Pre-Strain on the Aging Behavior of Al 7075 Alloy for Hot-Stamping Capability

Transmission Electron Microscopy Characterization of the Bake-Hardening Behavior of Transformation-Induced Plasticity and Dual-Phase Steels

Research on the Nanobainitic Features Formed in the Ultra-low Carbon Steel Non-Containing Nb and Ti Elements

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