Effect of tempering temperature and carbide free bainite on the mechanical characteristics of a high strength low alloy steel

Dongyu, Liu; Bai, Bin; Fang, Hongwei; Zhang, Wenzheng; Gu, Jing; Chang, Kaidi

doi:10.1016/s0921-5093(03)00270-3

Cited by 48 publications

(15 citation statements)

References 12 publications

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“…Among all these AHSS candidates, carbide-free bainite/martensite steels have been focused on due to their excellent properties during the past few years [3][4][5][6][7]. By addition of Si, carbide formation is suppressed during bainite transformation, and carbon enriched austenite films located between bainitic ferrite plates with high stability are retained, which promote the transformation induced plasticity (TRIP) effect and lead to the achievement of better mechanical properties [3][4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

A carbide-free bainite/martensite/austenite triplex steel with enhanced mechanical properties treated by a novel quenching–partitioning–tempering process

Gao

Zhang

Tan

et al. 2013

Materials Science and Engineering: A

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106

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Section: Introductionmentioning

confidence: 99%

A carbide-free bainite/martensite/austenite triplex steel with enhanced mechanical properties treated by a novel quenching–partitioning–tempering process

Gao

Zhang

Tan

et al. 2013

Materials Science and Engineering: A

Self Cite

106

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“…Many studies 10–12 have indicated that the strength and toughness of steels with bainite–martensite duplex‐phase structure were superior to those with the single martensite structure. Wei et al's study about the fatigue behaviour of 1500 MPa bainite–martensite duplex‐phase high‐strength steel showed that the steel has higher fatigue strength and fatigue crack threshold and lower crack propagation rate compared with fully martensitic steel 12 .…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, other methods such as controlling microstructure besides controlling inclusions should be explored to minimize the detrimental effect of inclusions and to improve the fatigue properties of highstrength steels. Many studies [10][11][12] have indicated that the strength and toughness of steels with bainite-martensite duplex-phase structure were superior to those with the single martensite structure. Wei et al's study about the fatigue behaviour of 1500 MPa bainite-martensite duplex-phase high-strength steel showed that the steel has higher fatigue strength and fatigue crack threshold and lower crack propagation rate compared with fully martensitic steel.…”

Section: Introductionmentioning

confidence: 99%

Very high cycle fatigue behaviour of 2000‐MPa ultra‐high‐strength spring steel with bainite–martensite duplex microstructure

Nie

Wang

et al. 2009

Fatigue Fract Eng Mat Struct

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A B S T R A C T The very high cycle fatigue and fatigue crack growth (FCG) behaviours of 2000-MPaultra-high-strength spring steel with different bainite-martensite duplex microstructures (designated as B-M1 and B-M2) obtained through isothermal quenching and fully martensite (designated as M) for comparison were studied in this paper by using ultrasonic fatigue testing and compact-tension specimens. It was found that for the B-M1 sample with wellcontrolled thin and uniformly distributed bainite, the fatigue crack threshold K th is higher and FCG rate da/dN at an early stage is lower than those of the M sample. Therefore, the former has rather longer fatigue life at high stress amplitude, though both have almost identical fatigue strength. However, the fatigue properties of bainite-martensite duplex microstructure are significantly deteriorated with the formation of large bainite. Furthermore, like that of the M sample, the S-N curves of the B-M1 and B-M2 samples also display continuous declining type and fish-eye marks were always observed on the fracture surface in the case of internal fractures, which were mainly induced by inclusion. A granular bright facet (GBF) was observed in the vicinity around the inclusion. For each of the three samples, the stress intensity factor range at the boundary of inclusion ( K inc ) decreases with increasing the number of cycles to failure (N f ), while the stress intensity factor range at the front of GBF( K GBF ) is almost constant with N f and equals to its K th . This indicates that K GBF might be the threshold value governing the beginning of stable crack propagation.Keywords bainite-martensite duplex microstructure; fatigue crack growth; medium carbon ultra-high-strength spring steel; stress intensity factor range; very high cycle fatigue.

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“…In general, Si suppresses carbide formation in steel, 5,15) similarly to Al. 9) Thus, it is considered that Si addition of 1.5 mass% results in such microstructural characteristics.…”

Section: Discussionmentioning

confidence: 98%

Microstructure and Retained Austenite Characteristics of Ultra High-strength TRIP-aided Martensitic Steels

Kobayashi¹,

Song²,

Sugimoto³

2012

ISIJ Int.

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A new type of 0.2%C-1.5%Si-1.5%Mn ultra high-strength low alloy TRIP-aided steel consisting of lath martensite structure matrix and metastable retained austenite films, "TRIP-aided martensitic steel; TM steel", was developed by means of quenching and partitioning process. In addition, effects of partitioning temperature and time on the microstructure and retained austenite characteristics were investigated. The matrix structure was composed of two kinds of lath martensite structures, or wide and narrow lath martensite structures. Most of the retained austenite of about 3 vol% was located along the narrow martensite lath boundary. On the other hand, a small amount of fine and needle-like carbides precipitated only in wider lath martensite structure. Partitioning at temperatures lower than 250°C for 1 000 s after quenching in oil or ice brine considerably increased carbon concentration of the retained austenite phase to about 1.0 mass%, maintaining volume fractions of retained austenite and carbide. Also, the carbon-enrichment mechanism in the retained austenite was proposed through TEM observation, as well as the carbide precipitation and coarsening mechanisms.

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Effect of tempering temperature and carbide free bainite on the mechanical characteristics of a high strength low alloy steel

Cited by 48 publications

References 12 publications

A carbide-free bainite/martensite/austenite triplex steel with enhanced mechanical properties treated by a novel quenching–partitioning–tempering process

A carbide-free bainite/martensite/austenite triplex steel with enhanced mechanical properties treated by a novel quenching–partitioning–tempering process

Very high cycle fatigue behaviour of 2000‐MPa ultra‐high‐strength spring steel with bainite–martensite duplex microstructure

Microstructure and Retained Austenite Characteristics of Ultra High-strength TRIP-aided Martensitic Steels

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