Effects of Microstructure and Notches on the Mechanical Properties of Dual-Phase Steels

Bayram, Ali; Uğuz, Agah; Ula, Murat

doi:10.1016/s1044-5803(99)00044-3

Cited by 99 publications

(49 citation statements)

References 21 publications

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“…The lower elongation of this material compared with other heat treated materials could be due to the fact that ferrite grains surrounded the martensite fracture in a brittle manner prior to the martensite fracture during necking [11]. The microstructure of the materials produced by the 890 and 850…”

Section: Resultsmentioning

confidence: 96%

The effect of strain rate on mechanical properties of cold forming sheet metals

Durmuş¹

2009

Materialwissenschaft Werkst

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Tensile mechanical properties of DIN EN 10268 -1999 cold forming sheet metals were investigated within a strain rate range from 1.10 -4 to 1.10 -1 s -1 using conventional tensile testing machine. This investigation also examined the influence of heat treatment on the mechanical properties of this material. The specimens were initially austenitized at 930 o C for 40 min and then water quenched. After reheated to 890, 850 and 810 o C, these were hold for 60 min and then water quenched as intermediate heat treatment. Consequently, it was determined that the yield and ultimate strength were increased 21 % and 7 % for the maximum value of strain rate, respectively. However, the failure strains were not notable affected with strain rate. For the heat treated materials, the considerable changing in mechanical properties was obtained at the 810 o C annealing temperature.

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Section: Resultsmentioning

confidence: 96%

The effect of strain rate on mechanical properties of cold forming sheet metals

Durmuş¹

2009

Materialwissenschaft Werkst

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“…It is not possible to find any study focusing on the effects of initial ferrite, pearlite and martensite grain sizes on microstructure and mostly on toughness of the material. It has been verified that microstructure particularly after an intermediate quenching treatment is different from that after an intercritical quenching process 12 . Thus, formation of fine martensite after intermediate quenching mostly degrades the tensile properties, but the percent elongation of the material increases gradually.…”

Section: Introductionmentioning

confidence: 94%

Studies of the properties of heat treated rolled medium carbon steel

2011

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Investigations were carried out to study critically the effects of heat treatment on the properties of rolled medium carbon steel. Representative samples of as-rolled medium carbon steel were subjected to heat treatment processes which are; Quenching, Lamellae Formation and Tempering in the following order (Q + Q + L + T), (Q + L + T) and (L + T). The steel was heated to the austenizing temperature of 830 °C and water quenched. The quenched steel was subjected to lamellae formation by reheating it to the ferrite-austenite dual-phase region at a temperature of 745 °C below the effective A C3 point and then rapidly quenched in water. The lamellae formed was tempered at 480 °C to provide an alloy containing strong, tough and lath martensite in a soft and ductile ferrite matrix. Mechanical tests were carried out on the samples and the results shows that the steel developed has excellent combination of tensile strength, hardness and impact strength which is very good for structural applications. The corrosion behaviour of the samples; heat treated rolled medium carbon steel and as-rolled medium carbon steel in sodium chloride medium were also investigated from where it was also confirmed that improved corrosion resistance is achievable by the treatment.

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“…17,28) The load at which crack initiation could be detected is found to be different for different specimens. Typically a load of 160.9 N is found to induce short cracks in the specimen containing 72.5 % bainite; at this load the number of cycles for crack initiation is found to be approximately 2.7ϫ10 5 . The values of stress to initiate cracks are found to range from 133.8 to 168.9 N. The magnitude of stress to initiate short cracks depends on the developed microstructure of the steel, the position of crack initiation with respect to the size and configuration of the micro notch.…”

Section: Crack Initiation Studies Related To Short Crackmentioning

confidence: 99%

“…The mechanical properties of dual-phase steels vis-à-vis their microstructures has been the subject of interest for over almost the last four decades because of their potential structural applications in automobile, defence, machinery components etc. [2][3][4][5][6][7][8] Considerable research efforts have been directed towards clarifying the tensile and impact toughness behaviour of dual-phase steels with respect to their microstructures, [9][10][11][12][13] whereas efforts to understand their fatigue properties are limited. Some fatigue studies on the ferrite-martensite dual-phase microstructures have been carried out by earlier researchers 14,15) with attempts to correlate this property with the volume fraction of martensite and its morphology.…”

Section: Introductionmentioning

confidence: 99%

Short Fatigue Crack Growth Behaviour in Ferrite–Bainite Dual-phase Steels

2008

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The influence of bainite content on the short crack growth behaviour has been examined in a series of ferrite-bainite dual phase steels containing 50.3-90.3 % bainite. Fatigue tests have been carried out using an earlier reported specimen configuration with the help of a rotating bending machine. These tests have been supplemented by characterization of the generated microstructures, determination of their hardness and tensile properties, and examinations of the nature of association of fatigue crack paths with microstructural constituents. The characteristic critical crack lengths above which linear elastic fracture mechanics may be applicable, the fatigue threshold values at the transition of short to long cracks, and the influence of microstructure on the crack path have been discussed. The maximum value of short crack fatigue threshold indicates a marginally increasing trend with increased amount of bainite. The fatigue crack path is found to be predominantly intra-granular for steels containing Ͻ70 % bainite while it is predominantly inter-granular for steels containing Ͼ70 % bainite.

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Effects of Microstructure and Notches on the Mechanical Properties of Dual-Phase Steels

Cited by 99 publications

References 21 publications

The effect of strain rate on mechanical properties of cold forming sheet metals

The effect of strain rate on mechanical properties of cold forming sheet metals

Studies of the properties of heat treated rolled medium carbon steel

Short Fatigue Crack Growth Behaviour in Ferrite–Bainite Dual-phase Steels

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Effects of Microstructure and Notches on the Mechanical Properties of Dual-Phase Steels

Cited by 99 publications

References 21 publications

The effect of strain rate on mechanical properties of cold forming sheet metals

The effect of strain rate on mechanical properties of cold forming sheet metals

Studies of the properties of heat treated rolled medium carbon steel

Short Fatigue Crack Growth Behaviour in Ferrite&ndash;Bainite Dual-phase Steels

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Short Fatigue Crack Growth Behaviour in Ferrite–Bainite Dual-phase Steels