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C. The figure below displays the profile of temperature (a) and stress across the blade of the Katana sword during the quench process. t= 0.0 s 1.0 1 .5 2.3 4.0 5.0 (a) 400 800 'C (b) Longitudinal -1300 1300 MPa Temperature stress (1) Describe why the sword initially bends downwards (~1 to 2.3 s) and subsequently bends upwards (> 4 s) during the quench process. Consider thermal expansion and residual stress in your answer. (2) What kind of stress is generated at the cutting edge of the sword as a result of the quench? Compressive or tensile stress? Is it beneficial or deleterious for the performance of the sword? Justify your answer.2. The Katana Sword The Katana sword is a metallurgical marvel developed empirically by generations of Japanese blacksmiths along centuries. Its production and properties highlight many important aspects of the microstructure and processing of Fe-C alloys including selection of Fe-C alloys with specific carbon concentrations, strengthening by grain size reduction and residual stress, and generation of a composite microstructure composed of hard and strong phases (martensite) with tough and ductile phases (bainite and pearlite) at specific positions in the sword where they are needed