Abstract
A popular issue of recent scientific research is surface modification technologies, such as using ultrasonic shot peening (USP) to make a nanocrystalline layer on workpiece surface, which made an enhanced layer has excellent mechanical properties. It's been also well explained of the microstructure evolution in deformation layers, including grain refinement and phase transformation. However, their physical properties, such as magnetic properties change upon treatment are rarely concerned. In this work, the magnetic properties and microstructure of 301 stainless steel upon ultrasonic shot peening for 5, 10 mins have been investigated. Their microhardness increased from 220 to 550 HV after USP treatment, meanwhile the thickness of enhanced layers were ~450 micro. From treat surface to matrix, specimens were grinded by per 100 ?m thickness (0~100 micro, 100~200 micro, etc.). Their magnetic properties were measured by physical property measurement system (PPMS) and magnetic property measurement system (MPMS). Corresponding microstructural evolution were measured by XRD, EBSD, and TEM. Magnetic properties (saturation magnetization and coercivity) and microstructures (martensite transformation, grain refinement) were significant changed in their gradient layers. The relationship between saturation magnetization and martensitic phase variable, coercivity and grain refinement will be discussed in this work.
Published Version
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