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Abstract
Hot compression and hot tension experiments on 9%Cr ferritic/martensitic steels were conducted by using a Gleeble 1500D thermal–mechanical simulator. Flow stress–strain data obtained from the compression tests were used to develop processing maps. Deforming mechanisms in different zeroes were summarized, and typical deformation microstructures had been observed. A thermoplastic graph under different temperatures was also obtained. The results indicate that flow stress, deformation microstructure, and power dissipation efficiency are closely connected with the hot deformation mechanism. The power dissipation rate in the flow instable domains is lower, and the corresponding microstructure can be categorized as dynamic recovery. And softer δ-ferrites are dispersed at the austenite boundaries with the help of hot deformation force. Thus, a new method of removing δ-ferrite of 9%Cr ferritic/martensitic steel is provided, and the optimum hot working condition is determined at higher temperatures (1100°C to 1250°C) and higher deformation rates (0.05 to 5 s−1).