Lab06_Recrystallization_DKSinha_ - San Francisco State...

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Final HRB you measured during Cold Work Lab (Lab 05) San Francisco State University School of Engineering ENGR 200: Materials of Engineering Recrystallization I. OBJECTIVES The purpose of this experiment is to study the effect of annealing temperature and time on the hardness of cold worked metals. II. INTRODUCTION Recrystallization   is   a   process   by   which  deformed grains are replaced by a new set of undeformed grains that nucleate and grow until the original  grains  have been  entirely  consumed  [1].  Upon  heating  a  cold-worked metal  to a sufficiently  high  temperature, new strain-free grains are nucleated in the recovered metal structure and begin to grow as  shown in Figure 1 [2]. The process restores a cold-worked material to its precold-worked condition, and is  usually accompanied by a reduction in the strength and hardness of a material and a simultaneous increase  in its ductility [3].  Figure 1 . The influence of annealing temperature (duration = 1 hour) on the tensile strength and ductility of a brass alloy. Grain size as a function of annealing temperature is indicated [2]. 1
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This note was uploaded on 09/08/2011 for the course ENGR 200 taught by Professor Staff during the Spring '11 term at S.F. State.

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Lab06_Recrystallization_DKSinha_ - San Francisco State...

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