Laboratory Six - TTT Diagrams

During this laboratory experiment we will examine if the predictions (structure and properties) of the TTT Diagram are experimentally observed. We will examine the hardness and microstructure of 1075 or 1080 steel processed as follows.

●           Untreated

●           Heated to 950F and held for 1 hr and Quenched to Room Temperature

●           Heated to 1120F and held for 1 hr and Quenched to Room Temperature

●           Heated to 1300F and held for 1 hr and Quenched to Room Temperature

●           Heated to 1700 F and held for 1-2 hrs and Quenched to Room Temperature

●           Heated to 1700 F held for 1-2 hrs , cooled to 950F held for 1 hr minutes, and Quenched to Room Temperature

●           Heated to 1700 F held for 1-2 hrs , cooled to 1120F held for 1 hr minutes, and Quenched to Room Temperature

●           Heated to 1700 F held for 1-2 hrs , cooled to 1300F held for 1 hr minutes, and Quenched to Room Temperature

●           Heated to 1700 F held for 1-2 hrs , Quenched to Room Temperature, heated 950F held for 1 hr minutes, and Quenched to Room Temperature

●           Heated to 1700 F held for 1-2 hrs , Quenched to Room Temperature, heated 1120F held for 1 hr minutes, and Quenched to Room Temperature

●           Heated to 1700 F held for 1-2 hrs , Quenched to Room Temperature, heated 1300F held for 1 hr minutes, and Quenched to Room Temperature

We will measure Hardness using the Rockwell A Scale. Ensure that any flakes are removed from the surface of the steel. We will mount and polish the samples as during lab 2 .

A lab data sheet is included to help you better prepare your notes for the technical memorandum describing the results of the laboratory experiment. This sheet is not to be turned in with the HW assignment. However, you are encouraged to use it to help prepare your answer to the HW question.