Instrumented testing of simulated Charpy specimens made of microalloyed Mn−Ni−V steel

Cvetkovski, Sveto

doi:10.1016/s1566-1369(02)80010-3

Cited by 13 publications

(1 citation statement)

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“…Metals 2021, 11, 1055 9 of 18 compare the impact of different microstructures on the impact toughness, an instrumented impact tester was used to record the relationship between impact load (or impact absorption energy) and displacement during the impact test. According to the typical load-time curve, the whole impact process can be divided into four stages: elastic deformation stage, plastic deformation stage, crack propagation stage, and ductile fracture stage [24][25][26]. When the test temperature is in the ductile-brittle transition temperature range of the material, the load-displacement curve can completely show the four stages of the impact process.…”

Section: Impact Toughness and Fracture Morphologymentioning

confidence: 99%

Effects of Microstructure on the Low-Temperature Toughness of an X80 × D1422 mm Heavy-Wall Heat-Induced Seamless Bend

Liu

Wang

et al. 2021

Metals

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The relationship between the microstructure and the low-temperature toughness of an X80 × D1422 mm heavy-wall heat-induced seamless bend was investigated, including the influence of microstructure on crack initiation and crack propagation. Using optical microscopy, scanning electron microscopy, transmission electron microscopy, and electron backscattered diffraction, the microstructure and crystallographic orientation characteristics were studied. An instrumented impact tester was used to investigate the impact toughness. The results showed that during the hot bending process, there was a difference in the induction heating temperature and the cooling rate results in the uneven microstructure of the inner surface, center position, and outer surface of the bend. The center position was mainly composed of granular bainite and exhibited the best combination of strength and toughness. The ductile–brittle transition temperatures of the inner surface, center position, and outer surface were −88, −85, and −60 °C, respectively. In the process of impact deformation, the non-uniformly distributed strain concentration regions are likely to cause uneven distribution of plastic deformation and the nucleation of microcracks. The high ratio of high-angle grain boundaries and the smaller effective grain size of the inner surface and center position lead to higher crack growth absorption energy. The low crack propagation energy of the outer surface is attributed to the fact that the high-angle grain boundary does not effectively deviate or arrest the crack propagation, and multiple microcracks are connected to one another and cause fracture failure.

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Section: Impact Toughness and Fracture Morphologymentioning

confidence: 99%