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摘要
The microstructure observation, mechanical properties and magnetic properties tests of 304H austenitic stainless steel prepared by drawing process with different deformation amount were carried out by optical microscopy, scanning electron microscopy (SEM), magnetic flux-meter, X-ray diffractometer (XRD), tensile testing machine and Vickers hardness tester. The results show that the microstructure of 304H stainless steel is significantly refined with the increase of deformation amount, and the strength and hardness rise significantly. When the true strain of the material is less than 1.2, the contribution of steel wire drawing strength comes from dislocation intercalation and deformation twins; when the true strain is more than 1.2, the change of steel wire drawing strength is mainly attributed to martensite transformation and dislocation propagation mechanism. The martensite transformation of 304H austenitic stainless steel is a γ-fccα'-bcc type transition without formation of intermediate phase. The martensite phase induced by deformation is the main ferromagnetic phase in 304H stainless steel, and the volume fraction of martensitic phase fM is linear with the saturation magnetization Ms of the steel wire, Ms=99fM-2.9. ? 2020, Editorial Board of Journal of Plasticity Engineering. All right reserved.
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