The laboratory experiments have been carried out to investigate the effects of different power supply circuits on the solidification quality of GCr15 manufactured by the single‐power, two‐circuit electroslag remelting process. According to the previous research, the different power supply circuits are named as conventional electroslag remelting withdrawal process (ESRW), single power two circuits electroslag remelting process (ESR‐STCCM) with up power process (ESR‐STCCM‐U) and down power process (ESR‐STCCM‐D), respectively. The profile and depth of the molten pool, macroscopic and microscopic solidification structure, macrosegregation and microsegregation (macro‐/microsegregation) are analyzed. Compared with the ESRW process, ESR‐STCCM process can obtain a flatter and shallower molten pool. Besides, experimental and numerical results adequately prove ESR‐STCCM process can reduce the width of the mushy zone and the local solidification time (LST), therefore, the macro‐/microsegregation of segregation elements for ESR‐STCCM process are dramatically improved compared with ESRW process, especially for ESR‐STCCM‐D process.
An aluminium-containing medium manganese steel has been designed to undergo intercritical annealing followed by quenching in water and subsequent partitioning. Water quenching, replacing the quenching temperature (QT) between 150 and 300°C in conventional quenching and partitioning steels, is therefore adopted in QP alloys, in order to guarantee the precise QT in practice. The low intercritical annealing temperature of 750°C refines both ferrite and prior austenite grains into submicron size. The large fraction of ultra-fine ferrite, as well as the transformation-induced plasticity effect of retained austenite, improves the overall ductility of this water-quenched and partitioned steel. The alloy has achieved excellent mechanical properties of 1130 MPa ultimate tensile strength combined with 19.2% total elongation.
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