Dynamic response of a Q&amp;P steel to high-strain-rate tension

Wang, Huanran; Zhang, Wenchao; De, Ma; Ma, Bohan; Chen, Danian; Yang, Xin; Fan, Caimei

doi:10.1016/j.camss.2017.09.003

Cited by 9 publications

(6 citation statements)

References 17 publications

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“…[77] In some studies of Q&P and TRIP steels, DIMT did not vary significantly during deformation at quasi-static or dynamic rates. [40,[88][89][90] In general, for Q&P steel microstructures, the mechanical stability of austenite is high and austenite volume fractions are relatively small, so perhaps a change in transformation behavior occurred, but was not easily resolvable; accurate measurement of austenite fractions in these steels remains challenging. [91,92] Another potential source of variability between studies arises due to evaluation of different austenitic microstructures; for example, austenite morphology and grain size can greatly affect the extent of DIMT because of the differences in alloy content, proximity to lath martensite and intercritical ferrite, and dislocation density of the lath martensite.…”

Section: B Mechanical Performance and Dimt In Trip-assisted Ahssmentioning

confidence: 99%

Strain Rate Dependent Ductility and Strain Hardening in Q&P Steels

Finfrock

Thrun

Bhattacharya

et al. 2021

Metall Mater Trans A

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Due to their high strength, formability and affordable cost, quenched and partitioned (Q&P) steels have shown the potential to reduce the mass of vehicles, thereby decreasing fuel consumption during service. Furthermore, because a lower mass of steel is used in each vehicle, energy consumption associated with the steelmaking process is also reduced. Q&P steels utilize the deformation-induced martensitic transformation (DIMT) of metastable retained austenite to enhance ductility and strain hardening. Accordingly, improvement of mechanical performance is contingent on the ability to precisely control the chemical and mechanical stability of austenite. Considering the multitude of factors that influence austenite stability, optimizing microstructures to delay necking or fracture is challenging, particularly as temperature and strain rate increase. Tensile tests of an intercritically annealed C-Mn-Si Q&P steel were performed over a range of strain rates (10 À4 to 10 À1 s À1 ) to evaluate effects on the DIMT and sheet tensile properties. As strain rates increased from 10 À4 to 10 À1 s À1 , the uniform elongation decreased from approximately 19 to 14 pct. This reduction in uniform elongation is associated with a decrease in the strain hardening exponent near the onset of strain localization. Based on experimental data from this study and review of previous research, it is postulated that the strengthening contribution of DIMT is controlled by competing effects of: (i) a decreasing chemical driving force for DIMT caused by deformation-induced heat accumulation at higher strain rates and (ii) an increasing number of martensite nucleation sites. This suggests that tailoring austenite stability for specific deformation conditions could enable further optimization of formability and vehicle crash behavior.

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Section: B Mechanical Performance and Dimt In Trip-assisted Ahssmentioning

confidence: 99%

Strain Rate Dependent Ductility and Strain Hardening in Q&P Steels

Finfrock

Thrun

Bhattacharya

et al. 2021

Metall Mater Trans A

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Section: Freeze-thaw Cycle and Dry-wet Cyclementioning

confidence: 99%

“…Considering the effect of dry-wet cycles on the disintegration of loess, the experiment results of Wang et al and Yang et al were slightly different [31,69]. Wang et al [31] used the surface loess of farmland in Yangling, Shaanxi Province, as the soil sample and conducted laboratory disintegration experiments under one to four dry-wet cycles. The results showed that the disintegration amount and average disintegration velocity of loess at the same moment decrease monotonously with the increase in the number of dry-wet cycles, indicating that dry-wet cycles inhibit loess disintegration.…”

Section: Freeze-thaw Cycle and Dry-wet Cyclementioning

confidence: 99%

“…Developed pores and fissures usually produce more severe rapid disintegration of loess. External factors encompass water environmental elements such as the temperature of the aqueous solution [21][22][23][24][25], hydrodynamic conditions [26], solution pH [27,28], salt concentration and type in the solution [21,29], and freeze-thaw and dry-wet cycles [30,31].…”

Section: Introductionmentioning

confidence: 99%

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Unraveling the Mystery of Water-Induced Loess Disintegration: A Comprehensive Review of Experimental Research

Chen,

Li,

Wang

et al. 2024

Sustainability

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Loess disintegration is a significant physicochemical and mechanical dissolution process that occurs when loess comes into contact with water. This phenomenon contributes to geological disasters such as loess cave erosion, landslides, and debris flows. The disintegration of loess can be influenced by both internal and external factors. Research on internal factors of loess disintegration has been widely recorded, but the research progress on external environmental factors that affect loess disintegration is not well summarized. This review summarizes the impacts of external water environmental factors on loess disintegration and reveals that six external water environmental factors, namely the temperature of the aqueous solution, hydrodynamic conditions, solution pH, salt concentration and type in the solution, freeze–thaw cycles, and dry–wet cycles, can significantly impact loess disintegration. Furthermore, this review delves into three key research areas in loess disintegration under the influence of these water environmental factors: experimental research on loess disintegration, the disintegration parameters used in such research and their variations, and the water–soil chemical reactions and microstructural changes during loess disintegration. It concludes that current experimental research on loess disintegration suffers from inadequate studies, with existing research associated with poor comparability and weak representativeness, and a lack of comprehensive, systematic analysis of its regularities of influence and response mechanisms from both microscopic and macroscopic perspectives. This paper can provide valuable insights for the prevention of loess geological disasters and engineering safety construction.

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“…Hu [6] determined the critical resolved shear stresses and hardening parameters of the constituent phases in QP980. Wang [7] provided the effects of strain rate and temperature on the dynamic tensile fracture strain of QP980 steel, whereas other scholars have studied the mechanical properties of TRIP800 steel [8][9][10][11]. Kussa [12] studied the austenite transformation kinetics and tensile properties of constructional 0.2 wt%C-Si2Mn2CrMoVNb TRIP-assisted steel.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Compression Properties of the Resistance Spot Welding of High Strength Steels under Varying Temperature Conditions

Fan

Wang

2021

Advances in Materials Science and Engineering

Self Cite

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In this paper, we have studied the dynamic compression performance of the RSW of QP980 steel and TRIP800 steel by using a split Hopkinson pressure bar (SHPB), and we have also examined the fracture mode of the two research objects. It is found that the spot welding zone is primarily composed of the martensite structure, and there is a sparse defect of crystal structure adjacent to the center of nugget. In addition, there are evident gaps between the plates on both sides of the spot welding zone. Through the measurement of the microhardness of the two grade steel, it is found that the average hardness of the RSW of QP980 steel is higher than that of TRIP800 steel. There is a softening region in the interface of the heat affected zone and the substrate zone. The dynamic compression experiments are carried out on the RSW of QP980 steel and TRIP800 steel under 200°C and 300°C conditions, and it is found that the strain rate would increase with the rising temperature, but the compressive strength would experience declines. Furthermore, the sparse defects of crystal structure adjacent to the center of nugget would lead to stress rebound when the specimen is compressed. Moreover, through the observation of the fracture surface of the recovered specimens, it is found that the fracture of the nugget is brittle, whereas the fracture mode of the sample is more complicated. In addition, the fracture surface features a number of “river pattern” cleavage facets, and there are very few dimples of ductile tearing. This study is expected to have huge implications to the safety of vehicle body under high-speed impact.

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Dynamic response of a Q&P steel to high-strain-rate tension

Cited by 9 publications

References 17 publications

Strain Rate Dependent Ductility and Strain Hardening in Q&P Steels

Strain Rate Dependent Ductility and Strain Hardening in Q&P Steels

Unraveling the Mystery of Water-Induced Loess Disintegration: A Comprehensive Review of Experimental Research

Dynamic Compression Properties of the Resistance Spot Welding of High Strength Steels under Varying Temperature Conditions

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