Linking constituent phase properties to ductility and edge stretchability of two DP 980 steels

Hu, Xiaohua; Sun, Xin; Raghavan, K. S.; Comstock, R. J.; Ren, Yang

doi:10.1016/j.msea.2020.139176

Cited by 24 publications

(8 citation statements)

References 28 publications

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“…The development of high strength steels has gone through several stages in the last two decades. Among the first group of high strength steels are low alloyed DP (dual phase) and TRIP (transformation induced plasticity) steels [1][2][3]. For both of them, special heat or thermo-mechanical treatment methods were developed, respectively for steels with carbon contents typically around 0.2%.…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, both types of steel were also investigated mainly for applications in the automotive industry. While DP steels aim at a two-phase microstructure consisting of the mixture of ferrite and martensite [2], the TRIP steels possess more complex microstructures of ferrite, bainite and retained austenite [3][4]. DP thus requires quick quenching once the sufficient amount of ferrite is obtained, while TRIP steels need a second isothermal hold at the temperature of intensive bainitic transformation to obtain a special, carbide-free bainite consisting of the bainitic ferrite and retained austenite laths [4].…”

Section: Introductionmentioning

confidence: 99%

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Effect of various heat and thermo-mechanical treatments on low alloyed CMnAlNb high strength steel

Kučerová¹,

Tichá²,

Stehlík³

2022

Manufacturing Technology

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Low carbon low alloyed high strength steel with the chemical composition suitably designed to support the stabilization of retained austenite was used in this work. The steel was processed by conventional annealing for a reference and several different heat and thermomechanical treatments were further proposed to test typical TRIP (transformation induced plasticity), DP (dual phase) steel and QP (quenching and partitioning) processing routes. All the processing methods used the same soaking temperature of 1050 °C. Processed samples were subjected to metallographic analysis, hardness measurement and tensile test to characterise resulting microstructures. While simple annealing reached tensile strength of 861 MPa with 25% of total elongation, the best combination of the highest tensile strength of 903 MPa and a total elongation of 32% was obtained after processing typical for TRIP steel. QP treatment resulted in the highest tensile strength of 1289 MPa with a total elongation of 19%.TRIP steel DP steel QP treatment high strength steel

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of various heat and thermo-mechanical treatments on low alloyed CMnAlNb high strength steel

Kučerová¹,

Tichá²,

Stehlík³

2022

Manufacturing Technology

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show abstract

“…Understanding the balance of these deformation modes is important for determining suitable materials for a given application. Hu et al [ 1 ] showed that an increase in the local elongation of dual phase (DP) 980 steel correlated with an improvement in the hole expansion ratio obtained during hole piercing tests, classified as the edge stretchability. Taylor et al [ 2 ] reported that the hole expansion ratio of DP980 steel decreased as the martensite hardness and martensite/ferrite hardness ratio (as determined by nanoindentation tests) increased.…”

Section: Introductionmentioning

confidence: 99%

Hardness–Deformation Energy Relationship in Metals and Alloys: A Comparative Evaluation Based on Nanoindentation Testing and Thermodynamic Consideration

2021

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Nanoindentation testing using a Berkovich indenter was conducted to explore the relationships among indentation hardness (H), elastic work energy (We), plastic work energy (Wp), and total energy (Wt = We + Wp) for deformation among a wide range of pure metal and alloy samples with different hardness, including iron, steel, austenitic stainless steel (H ≈ 2600–9000 MPa), high purity copper, single-crystal tungsten, and 55Ni–45Ti (mass%) alloy. Similar to previous studies, We/Wt and Wp/Wt showed positive and negative linear relationships with elastic strain resistance (H/Er), respectively, where Er is the reduced Young’s modulus obtained by using the nanoindentation. It is typically considered that Wp has no relationship with We; however, we found that Wp/We correlated well with H/Er for all the studied materials. With increasing H/Er, the curve converged toward Wp/We = 1, because the Gibbs free energy should not become negative when indents remain after the indentation. Moreover, H/Er must be less than or equal to 0.08. Thermodynamic analyses emphasized the physical meaning of hardness obtained by nanoindentation; that is, when Er is identical, harder materials show smaller values of Wp/We than those of softer ones during nanoindentation under the same applied load. This fundamental knowledge will be useful for identifying and developing metallic materials with an adequate balance of elastic and plastic energies depending on the application (such as construction or medical equipment).

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“…However, a recent study showed that materials of similar AHSS grades from different steel makers have very different hole expansion formability, although they have similar specifications [13]. Phase property disparity has been found to be a key factor [14,15] that influences the true fracture strain and formability in cases in which no deformation instability or necking is present, such as hole expansion.…”

Section: Classification Of Steelsmentioning

confidence: 99%

Advanced High-Strength Steel - Basics and Applications in the Automotive Industry

Feng

2021

Self Cite

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Linking constituent phase properties to ductility and edge stretchability of two DP 980 steels

Cited by 24 publications

References 28 publications

Effect of various heat and thermo-mechanical treatments on low alloyed CMnAlNb high strength steel

Effect of various heat and thermo-mechanical treatments on low alloyed CMnAlNb high strength steel

Hardness–Deformation Energy Relationship in Metals and Alloys: A Comparative Evaluation Based on Nanoindentation Testing and Thermodynamic Consideration

Advanced High-Strength Steel - Basics and Applications in the Automotive Industry

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