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Odkształcenia szokowe w meteorytach żelaznych skutkiem rozprężenia materii jądra małych planet po ich kolizyjnym rozbiciu

100%

Specht J.

2016

tom 7

123-132

The interiors of small planets under high pressure of a few GPa formed iron-nickel core. During slow cooling, this matter underwent crystallization into forms of small bars made of kamacite. After breaking the planets as a result of cosmic collisions of nuclei matter has rapidly expanded and created rapid pressure waves, which resulted in the formation of Neumann lines.

We wnętrzach małych planet, w warunkach wysokiego ciśnienia, rzędu kilku GPa, powstały żelazoniklowe jądra. W trakcie powolnego wychładzania materia ta ulegała krystalizacji do postaci beleczek kamacytu. Po rozbiciu planet na skutek kosmicznych kolizji, materia jąder ulegała gwałtownemu rozprężeniu. Powstały gwałtowne fale ciśnienia, które także mogą wyjaśnić zniekształcenia szokowe w postaci linii Neumanna lokalizujących bliźniaki odkształcenia.

Tailoring the strength-ductility balance of a commercial austenitic stainless steel with combined TWIP and TRIP effects

72%

Sohrabi M. J. , Mirzadeh H. , Sadeghpour S. , Geranmayeh A. R.

2023

tom Vol. 23, no. 3

art. no. e170, 2023

The sequential twinning-induced plasticity (TWIP) and transformation-induced plasticity (TRIP) effects were induced in a commercial AISI 304L stainless steel by tailoring the average austenite grain size (via thermomechanical processing of cold rolling and reversion/recrystallization annealing), leading to a combination of high yield stress and total elongation as well as a remarkable strength-ductility synergy similar to advanced high-strength steels (AHSS) for automotive industry. In fact, the refinement of grains promoted the TWIP effect at the expense of the TRIP effect due to its effect on increasing the apparent stacking fault energy; while the coarsening/growth of grains led to a pronounced TRIP effect via deformation-induced martensitic phase transformation during straining. Moreover, the TRIP/TWIP effects were characterized by the simple work-hardening analysis such as slope change and appearance of extremum points on the curves of work-hardening rate, logarithmic and parabolic segments on the curves of instantaneous work-hardening exponent, and deviations from the strain-hardening Hollomon lines. The results were supported by the interrupted tensile tests and detailed electron backscattered diffraction (EBSD) analysis, where the merit of the TWIP-TRIP steels was shown in the case of a commercial austenitic stainless steel.