10_14

Materials Science and Engineering: An Introduction

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240 10.35 This problem asks for estimates of Brinell hardness values for specimens of an iron-carbon alloy of composition 0.45 wt% C that have been subjected to some of the heat treatments described in Problem 10.16. (a) The microstructural product of this heat treatment is 100% martensite. According to Figure 10.24, the hardness of a 0.45 wt% C alloy consisting of martensite is about 630 HB. (d) The microstructural product of this heat treatment is 100% spheroidite. According to Figure 10.22(a) the hardness of a 0.45 wt% C alloy with spheroidite is about 150 HB. (h) The microstructural product of this heat treatment is proeutectoid ferrite and fine pearlite. According to Figure 10.22(a), the hardness of a 0.45 wt% C alloy consisting of fine pearlite is about 200 HB. 10.36 This problem asks for estimates of tensile strength values for specimens of an iron-carbon alloy of eutectoid composition that have been subjected to some of the heat treatments described in Problem 10.19. (a)
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