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Próby napawania stali walcowanej termomechanicznie S700MC

Górka J.

Spajanie Materiałów Konstrukcyjnych

2018

Nr 4 (42)

10--13

W ostatnich latach nastąpił bardzo dynamiczny rozwój konstrukcji stalowych. Jest to spowodowane wzrostem wielkości tych konstrukcji oraz ich skomplikowania, jak również stawianym wobec nich wymaganiom eksploatacyjnym. W celu spełnienia tych kryteriów coraz częściej stosowanymi materiałami na te konstrukcje są stale o coraz to wyższych właściwościach wytrzymałościowych.

Hot-working in the γ + α region of TRIP-aided microalloyed steel

Grajcar A.

Archives of Materials Science and Engineering

2007

Vol. 28, nr 12

743-750

Purpose: The aim of the paper is to investigate the influence of hot-working in the γ + α range and isothermal holding temperature in a bainitic range on a stability of retained austenite in a TRIP-aided microalloyed steel. Design/methodology/approach: The thermomechanical processing in the γ + α range to obtain multiphase structures with the retained austenite in a microalloyed steel was realized. It consisted of plastic deformation of specimens at 750°C or 780°C, oil cooling and isothermal holding in a bainitic region. Degree of deformation was 28 or 50%. To reveal the multiphase structure optical and transmission electron microscopy were used. X-ray diffraction method was employed to determine a volume fraction of retained austenite. Findings: It was found that hot-working in the two-phase region influences essentially a multiphase structure of investigated steel. The ferrite fraction is comparable for heat-treated and thermo-mechanically processed specimens but the ferrite grain size is twice smaller in a case of plastically-deformed specimens. The optimum isothermal holding temperature in a bainitic range is 300°C, independent on austenitizing temperature. The specimens forged in the γ + α range and isothermally held at this temperature made it possible to obtain about 10% of retained austenite. Research limitations/implications: Investigations concerning the influence of isothermal holding time in a bainitic range on the stability of retained austenite should be carried out. Practical implications: The established conditions of the thermomechanical processing can be useful in a development of the hot-rolling technology for TRIP-aided microalloyed steels. Originality/value: The realized thermomechanical processing enabled to obtain about 10% fraction of retained austenite in a steel containing 0.5% Si.