Wires of Fe-0 .09wtO oAI-O.O I wt O oN alloy were cold-drawn by 68.6 % reduction in area after solution treatment of J 250°C X J hr and quenching into ice water.A large decrease in electrical resistivity was observed in a tem/)erature range from 450° to 620°C in 10°C-JO min isochronal annealing, which was attributed to the /n-ecip itation of AI N . This temperature range was about ] OO°C lower than that in unstrained specimen. The dissolution qf Cottrell atmospheres, which had beenJarmed by strain aging at low temperatures was not observed bejare the precipitation of AI N.T he precipitation process q{ AIN in a deformed matrix obeyed the law of fmt order kine tics after a cerlain /)eriod of time in isothermal annealing below about 580°C. T he activation ene~I!Y obtained for the jirst order process was 58 kcal jmol, which suggested that the rate of the precipitation of AI N in a dejarmed matrix was controlled b)1 the diffusion of aluminum in Q -U'On. .T he precipitates qf AI N of cubic lallice structure were occasionally found in the early period ofJJI"eci/)itation /)rocess, but AI N precipitated mainly in the hexagonal lattice structure.R eclystalliZfltion was inhibited strongly by the jine precipitates q{ AI N formed along dislocations, whichever the c,:rstalline structure was.
Synopsis:The influence of carbon content on cold rolling and annealing textures of Fe-C alloys containing 0.003, 0.011, 0.021 wt%C has been studied. To avoid the effects of pre-existing grain boundary and texture, hot rolled sheets with coarse grain and random texture are used. The results obtained are as follows.(1) The structure and the texture of cold rolled sheet are largely affected by the amount of carbon in solution. When the amount of carbon in solution is small, sharp cell structure and rolling texture are formed. In the deformed grains with {111} planes parallel to sheet surface, crystal rotation from {111}<112> to {111}<110> around the <111>//N.D. axis is dominant.The main components of the annealing texture are {111}<112> and {111}<110>. When the amount of carbon in solution is large, cell structure and rolling texture are diffuse in the cold rolled sheet. In this case, crystal rotation from {111}<112> to {110}<001> around the <110>//T.D. axis is indicated to be dominant in the {111}<112> deformed matrix. The main component of the recrystallization texture is {110}<001>.(2) The effect of reducing carbon in solution by precipitation treatment before cold rolling on the formation of rolling and annealing textures is more important than that of the precipitated cementite itself.
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