Abstract The structural stability of ausferrite in thin-walled Austempered Ductile Iron (ADI) castings with 5 mm wall thickness is compared to a reference casting 25 thickness. and were first austenitized between 850 925 °C, then austempered 250 380 °C. X-ray diffraction (XRD) investigations changing temperature performed − 260 up + 450 °C investigate the change phase fraction, lattice paramete...

In the present study, isothermal decomposition of austenite to bainite in 1.0 wt% carbon, 0.21% silicon steel during partitioning step a quenching and (Q&P) heat treatment has been investigated dilatometer temperature range 200 350 °C compared conventional austempering treatment. The transformation was shortened by about 75% presence pre-existing martensite (QP). kinetics is described well-...

In this study, a multi-element microalloyed GCr15Si1MoNbV bainitic bearing steel was designed by adding trace amounts of Nb and V. The bainite/martensite/retained austenite/undissolved carbide multiphase with short heat-treated cycle remarkable comprehensive mechanical properties prepared via low-temperature austempering, which compared traditional quenched tempered martensitic microstructure. ...

Abstract The microstructure of a low alloy medium carbon bainitic steel, austempered in the temperature range 275 °C to 450 has been investigated by detailed electron backscatter diffraction and variant pairing analysis. It is observed that tendency two distinct changes with varying temperature. At V1-V6 most frequent, whereas V1-V2 frequent at intermediate highest temperature, V1-V4 dominates....

In the paper fundamentals of steel parts quench process in liquid media are considered which used for designing new technologies such as intensive quenching that results obtaining fine and nano – bainitic microstructure. These include French law transient nucleate boiling establishing during media, duration, when film is absent, self regulated thermal process. Based on listed fundamentals, vers...