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Farah Siddique,Fuguo Li,Mirza Zahid Hussain,Qian Zhao,Qinghua Li 대한금속·재료학회 2023 METALS AND MATERIALS International Vol.29 No.12
High speed impact at strain rates > 103s−1 has generic characteristics in context of energy absorption and adiabatic temperaturerise. An ultra-high strength low alloy steel (USLA, 3.8 mm thick) subjected to high-speed impact has been investigatedby focusing on energy absorption driven by thermo-kinetics phenomenon in correlation with the target plate thickness. Resultwas bulge and reduction in thickness up to 2 mm at impact point. An analytical model has been proposed by establishing arelation between absorbed energy and plate thickness to explain deformation characteristics. EBSD analysis was carried outat three specified points, i.e., impact zone (IZ), impact affected zones (IAZ; through-thickness direction near backside) and(IAZ; radial/circumferential direction) with in 3 mm diameter. Impact analysis was carried out in Ls Dyna computer code. EBSD and FE (finite element) analysis revealed that the shear wave velocity under the influence of adiabatic temperaturerise up to 520 K has generated adiabatic shear bands in IZ and IAZ (through-thickness direction), however in the IAZ (radialdirection), the plate experienced no adiabatic temperature and increased stress due to compressive wave velocity resultedin greater proportion of recrystallized grain structure which is 25.79% as compared to 10.98% in IAZ(through-thicknessdirection) and 6.19% in IZ (impact zone). Micro hardness testing of these three distinct zones also revealed that IAZ (radialdirection) has higher hardness (630HV) than IZ (600HV) and IAZ (through-thickness direction) (570HV) owing to increasedand evenly distributed fine-grained microstructure in IAZ (radial direction), and relatively less deformation damage.
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Liying Niu,Dajing Li,Chunquan Liu,Fuguo Liu 한국식품과학회 2015 Food Science and Biotechnology Vol.24 No.3
Lipoxygenases (LOX) in milk-stage sweet corn and waxy corn were extracted using a phosphate buffer (pH 7.0) and enzyme activities were determined using linoleic acid as a substrate. Michaelis constant (Km) values, decimal reduction times (D value), temperature sensitivity parameters (Z value), and activation energies (Ea) were calculated. Enzymes from both corn types followed first-order inactivation kinetics within 0-25 min and 50- 70℃. However, enzymes exhibited different pH profiles and affinities toward linoleic acid. Km values (4.34 and 1.40 mM for sweet corn and waxy corn, respectively), heat stability values, and Ea values (116.81 and 246.82 kJ/mol) were different. Waxy corn LOX was more heat stable below 65℃ with a higher D value, but was more temperature sensitive with a lower Z value. The different characteristics suggested the presence of different isoenzymes and necessitated the use of different parameters for blanching.
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Zhanwei Yuan,Shanglin Wang,Hao Zhang,Fuguo Li,Rui Ma,Jie Bai 대한금속·재료학회 2023 METALS AND MATERIALS International Vol.29 No.11
GH3536 nickel-based superalloy was prepared using selective laser melting (SLM) to study its hot deformation behavior,microstructure evolution, and recrystallization mechanism during hot compression. GH3536 superalloy was hot compressedby a Gleeble-3800 hot simulation testing machine. The compression temperature was 900℃~1050℃, and the strain rate was0.01s− 1~10s− 1. The results show that the deformation conditions will significantly affect the flow stress, dislocation density,and the development of grain boundary and subgrains boundary. The dynamic recrystallization (DRX) mechanism is alsoeasily affected by the deformation conditions and different deformation regions. The alloy has experienced work hardening(WH), dynamic recovery (DRV), and DRX in hot deformation and finally entered the steady-state rheological stage. Thedynamic softening effect is more evident at a low strain rate. The temperature will strongly affect the migration of dislocationsand limit the transformation from LAGB to HAGB, thus affecting the formation of grain boundaries and finally affectingthe DRX mechanism. It is found that DRX is not a single process, and discontinuous dynamic recrystallization (DDRX)and continuous dynamic recrystallization (CDRX) exist at the same time. DDRX is the primary nucleation mechanismcharacterized by grain boundary expansion. CDRX is an auxiliary nucleation mechanism characterized by gradual rotationof subgrains, and CDRX is easier to activate at low temperatures.
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