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  3.   a) assume that you have two aisi 1045 cylindr

  a) Assume that you have two AISI 1045 cylindrical samples with two different diameters: one...

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Mechanical Engineering

 

a) Assume that you have two AISI 1045 cylindrical samples with two different diameters: one 1 in. thick and the other 2 in. thick. You astenitize and quench both samples in water. Then you cut a section and measure the hardness at the center of each sample. Would you expect to get the same results? Explain your answer.

b) Assume that you have two cylindrical steel samples with 1 in. diameter, one made out of AISI 1045 and another one made out of AISI 4140. You austenitize and quench both samples in oil. Then you cut a section and measure the hardness at the center of each sample. Would you expect to get the same results? Explain your answer.

Answer & Explanation Solved by verified expert
3.6 Ratings (505 Votes)
a AISI 1045 steel is a medium tensile steel supplied in the black hot rolled or normalized condition It has a tensile strength of 570 700 MPa and Brinell hardness ranging between 170 and 210 The term austenitization means to heat the steel to a temperature at which it changes crystal structure from ferrite to austenite The ferrite exists from room temperature to about 1330 degrees F at which point under equilibrium conditions it begins to change to austenite A medium carbon steel will be    See Answer
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