Effect of retained austenite on the dynamic tensile behavior of a novel quenching-partitioning-tempering martensitic steel

Qin, Hao; Qin, Shengwei; Liu, Yu; Zuo, Xunwei; Chen, Nailu; Wen, Hao; Rong, Yonghua

doi:10.1016/j.msea.2016.03.007

Cited by 39 publications

(33 citation statements)

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“…Both the increased temperature and strain rate affect the mechanical response of steels, especially of steels with a (meta)stable austenite fraction. Several authors reported excellent behaviour of Q & P steels tested at high strain rates (500-2000 s −1 ), certainly concerning the deformation capacity [39,40].Although static tests were performed at high and low temperatures and dynamic room temperature tests, all revealed interesting aspects on the mechanical behaviour of Q & P steels and limited to no data is available on the dynamic response of Q & P steels at temperatures different from room temperature. Assessment and understanding of the combined effect of high strain rates and temperatures deviating from room temperature on the metastable austenite are crucial in evaluating the potential of Q & P steels.…”

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Temperature Dependence of the Static and Dynamic Behaviour in a Quenching and Partitioning Processed Low-Si Steel

Vercruysse

Celada-Casero

Linke

et al. 2020

Metals

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Because of their excellent combination of strength and ductility, quenching and partitioning (Q & P) steels have a great chance of being added to the third generation of advanced high strength steels. The large ductility of Q & P steels arises from the presence of 10% to 15% of retained austenite which postpones necking due to the transformation induced plasticity (TRIP) effect. Moreover, Q & P steels show promising forming properties with favourable Lankford coefficients, while their planar anisotropy is low due to a weak texture. The stability of the metastable austenite is the key to obtain tailored properties for these steels. To become part of the newest generation of advanced high strength steels, Q & P steels have to preserve their mechanical properties at dynamic strain rates and over a wide range of temperatures. Therefore, in the present study, a low-Si Q & P steel was tested at temperatures from −40 • C to 80 • C and strain rates from 0.001 s −1 to 500 s −1 . Results show that the mechanical properties are well-preserved at the lowest temperatures. Indeed, at −40 • C and room temperature, no significant loss of the deformation capacity is observed even at dynamic strain rates. This is attributed to the presence of a large fraction of austenite that is so (thermally) stable that it does not transform in the absence of deformation. In addition, the high stability of the austenite decreases the elongation at high test temperatures (80 • C). The additional adiabatic heating in the dynamic tests causes the largest reduction of the uniform strain for the samples tested at 80 • C. Quantification of the retained austenite fraction in the samples after testing confirmed that, at the highest temperature and strain rate, the TRIP effect is suppressed.Metals 2020, 10, 509 2 of 22 twinning induced plasticity (TWIP) and austenitic steels. These steels have excellent properties, though their use is limited because they require large amounts of expensive alloying elements such as Ni, Mn and Cr [8][9][10][11]. In recent years, a third generation of AHSS is being developed. Steels which may claim to be part of the third generation are medium to high manganese steels [12][13][14][15], complex phase steels [16], steels produced via severe plastic deformation [17] or ultrafast thermal processing routes [18][19][20][21], and quenched and partitioned (Q & P) steels [22,23].Q & P steels first appeared in literature in 2003 and have gained research interest since then [23]. Q & P steels combine high strength and ductility because of their complex multi-phase microstructure. This microstructure is obtained by imposing a (two-step) thermal cycle to low carbon steel with Si/Al as most the important alloying elements. After initial austenisation, the material is quenched to the quenching temperature situated in between the martensite start (Ms) and martensite finish temperature (Mf). This creates a microstructure of martensite and austenite of equal carbon content. The fractions of both are determined by the quenching temperature ...

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Temperature Dependence of the Static and Dynamic Behaviour in a Quenching and Partitioning Processed Low-Si Steel

Vercruysse

Celada-Casero

Linke

et al. 2020

Metals

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“…Previous studies involving quasi-static tensile tests have indicated that the ρ ̅ A of retained austenite rapidly increases from 11.62×10 14 m −2 before deformation to 42.16×10 14 m −2 with an increase in the strain due to the multiplication of dislocations, which leads to a high strain hardening behavior. However, the ρ ̅ M of martensite does not exhibit a similar change, but instead decreases from 6.59×10 14 m −2 before deformation to 4.99×10 14 m −2 at 3% strain, and then gradually increases to 6.52×10 14 m −2 at fracture, a value which is still lower than that before deformation [48]. This phenomenon was explained by the DARA effect, in that the reduction in ρ ̅ M during initial deformation reflects the fact that the number of dislocations transported to the retained austenite exceeds the number produced in the martensite by dislocation multiplication.…”

Section: Effect Of Microstructure On Apparent Parametersmentioning

confidence: 85%

“…The results obtained indicate that Q-P-T steel consists of a martensitic matrix with retained austenite, whereas the Q&T steel consists essentially of single-phase martensite. Previous work has indicated that the average dislocation density ( M p ) in the martensite of this Q-P-T steel is 6.59×10 14 m −2 before deformation, but is 6.78×10 14 m −2 in Q&T steel, and so it is the lower dislocation density of Q-P-T steel that leads to its lower yield strength [48]. This lower dislocation density is attributed to a depletion of carbon in the martensite matrix during Q-P-T that is caused by a partitioning of carbon from the supersaturated martensite to retained austenite, a phenomenon that does not occur in Q&T steel due to the effective absence of retained austenite.…”

Section: Effect Of Microstructure On Apparent Parametersmentioning

confidence: 86%

“…In Q&T steel, on the other hand, the linear increase in the ρ ̅ M of martensite from 6.78×10 14 m −2 before deformation 16 to 7.85×10 14 m −2 at fracture indicates that there is no DARA effect, most likely because of insufficient retained austenite [48]. This same DARA effect is evident in the Q-P-T samples of the present study, as evidenced by the fact that the ρ ̅ M of the T-C sample decreases from 6.59×10 14 m −2 before deformation to 5.96×10 14 m −2 at location No.1 in Table 5 with increasing strain, and then gradually increases to 6.56×10 14 m −2 at position No.…”

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confidence: 99%

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Relation between microstructure and formability of quenching-partitioning-tempering martensitic steel

Qin

Liu

et al. 2016

Materials Science and Engineering: A

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Effects of Retained Austenite and Softened Martensite on High‐Cycle Fatigue Behavior of Spring Steel under Two Loading Modes

Qin

Zhou

Yang

et al. 2023

steel research int.

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A novel quenching-partitioning-tempering (Q-P-T) process is applied to 60Si2Mn spring steel, resulting in multiphase microstructures consisting mainly of retained austenite (RA) and softened martensite (SFM). The influence of multiphase microstructures on the high-cycle fatigue behavior of Q-P-T and traditional quenching and tempering (Q&T) spring steels are investigated under rotating-bending and tensiontension loading. The results indicate that the fatigue strength of Q-P-T spring steel with RA, SFM, and lower quenching stress increases by 23.9 and 14.4% under cyclic rotating-bending and tension-tension loadings, respectively, compared with that of Q&T spring steel. Under both loading modes, the fatigue crack of the Q-P-T spring steel is mainly initiated from the interface between the martensitic matrix and inclusions or carbides. In contrast, the fatigue crack of the Q&T spring steel is mainly initiated from the plastic area around the martensitic matrix rather than inclusions. The RA, SFM, and lower quenching stress of the Q-P-T spring steel are conducive to the formation of dimples and tear ridges in the crack propagation and ultimate failure areas, whereas the inadequate SFM and higher quenching stress of the Q&T spring steel are prone to the formation of quasi-cleavage facets and secondary cracks.

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Effect of retained austenite on the dynamic tensile behavior of a novel quenching-partitioning-tempering martensitic steel

Cited by 39 publications

References 40 publications

Temperature Dependence of the Static and Dynamic Behaviour in a Quenching and Partitioning Processed Low-Si Steel

Temperature Dependence of the Static and Dynamic Behaviour in a Quenching and Partitioning Processed Low-Si Steel

Relation between microstructure and formability of quenching-partitioning-tempering martensitic steel

Effects of Retained Austenite and Softened Martensite on High‐Cycle Fatigue Behavior of Spring Steel under Two Loading Modes

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