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Keywords: Maraging aging steels, Spinning, Aging, Microstructure, Performance, Phase. Abstract. The raw material of tested T250 Maraging aging steel is solid-solution steel pipe. Microstructure, performance and phase changes of T250 steel pipe after spinning and aging were studied by Optical Microscope (OM), Scanning Electron Microscope (SEM), X-ray Diffraction (XRD), Three Dimensional Atom Probe (3DAP) tests and so on. The study shows that the structure of T250 is elongated and directional after spinning processing, and the matrix structure is martensite matrix with a large amount of global phases in diffuse distribution. After aging treatment, phases Al3Ti and Ni3Al transform into Ni3(Al,Ti) which gradually turns from globular to short rod, and Fe2Mo to MoSi2. The hardness of T250 steel pipe enhances mainly because of work hardening and aging strengthening.

Microstructure, Performance and Phase Study on T250 Maraging aging steel Pipe after Spinning and Aging