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High Cr ferrite/martensite steels are the primary candidate structural material used in first-wall of Test Blanket Module(TBM)for fusion reactor applications.In this paper,the influence of compressive deformation in metastable austenite zone(at 700,600 and 500 ℃,respectively)on martensitic transformation behavior and microstructural characteristic for the high Cr ferrite/martensite steel is investigated by using high-resolution dilatometry and transmission electron microscopy(TEM)observation.The results show that compressive deformation in metastable austenite zone results in decrease of martensite lath width,and increase of martensite starting temperature(Ms),due to increase of defection density for martensitic nucleation.