Dynamic Recrystallization and Dynamic Precipitation Behaviors of a 17Ni–0.2C Martensite Steel Studied by In Situ Neutron Diffraction

Abstract

Fig. 7. Austenite (111) peaks and fitting results: (a, b) non-splitting, eϭ0.0; (c, d) peak splitting at eϭ0.15; (e, f) disappearance of peak splitting at eϭ0.33.

Combination of dynamic transformation and dynamic recrystallization for realizing ultrafine-grained steels with superior mechanical properties

“…3a2), austenite is firstly deformed prior to the formation of ferrite. At high temperatures, ferrite phase is softer than the work-hardened austenite phase3050. Once ferrite is dynamically transformed from austenite, the strain will be more concentrated on the soft ferrite phase (i.e., ε α d(V i ) >  ε γ d(V j )).…”

Effects of Volume Fraction and Carbon Concentration of Austenite on Formation of Ultrafine Grained Ferrite/Austenite Duplex Microstructure by Warm Compression

“…The in situ neutron diffraction study about 3.6 ks pretempered 17Ni-0.2C steel 20) has shown that the heterogeneous deformation occurs during warm compression and the ferrite matrix is subject to larger plastic deformation than the carbon-enriched austenite, i.e. the former is softer than the latter.…”

“…In this paper, the effects of austenite precipitation and the carbon enrichment/depletion in austenite on the dynamic recrystallization during warm compression were investigated by using two high-nickel martensite steels with different carbon contents through microstructure observations. Considering that the neutron diffraction has been employed as a powerful technique for in situ materials characterization, 18,19) in another complementary paper, 20) the warm deformation and dynamic recrystallization behaviors of the carbon-added high-nickel martensite steel were in situ investigated by neutron diffraction to make clear the grain refinement mechanism and the related crystallographic evaluation data were reported.…”

In situ TOF neutron diffraction during phase transformation in an engineering steel

“…Therefore, in situ neutron diffraction must bring a big impact to develop advanced material processing. The content of this paper was partially reported by oral presentations [5][6][7] and the full papers are now under preparation. …”

“…Particularly, Time Of Flight (TOF) measurements with multidetectors provide useful data on phase volume fraction, texture, phase and intergranular strains (stresses), which cannot be obtained by any other experimental techniques. This method is expected to be applied to diffusional transformations and recrystallization in different steels and such a challenge has been reported [3,4]. Although the time resolution is not enough to follow the quick transformation kinetics at the present, the situation must be improved in near future at J-PARC.…”