Heat Treatment of Mild Steel
Title: Heat Treatment of Ferrous
Objective:
To determine the effect of heat treatment on mechanical properties of 1050 Steel.
To reveal the microstructures of 1050 steel during heat treatments.
Abstract
In this experiment, we observed how the properties of plain carbon steel vary with the heat treatment condition. We prepared six different samples in three different heat treatment configurations and performed hardness tests on them by using the Rockwell tester and observed the microscopic using optical microscope. Based on the optical microscope observation, we found that the crack is appeared at the tempering stage, because the grain size is larger compared at the austenitizing stage at higher tempering temperature. Larger grain will cause the less phase boundary area, lower strength and higher ductility which give the reasons for a crack to appear. Conventional heat treatment procedures for producing martensitic steels generally involve continuous and rapid cooling of an austenitized specimen in water and room temperature for tempered specimen. The properties of a steel that has been quenched and then tempered depends largely on the rate of cooling and tempering times and temperatures. During the quenching heat treatment, the specimen can be converted to a variety of microstructures including soft and ductile spheroidite to hard and brittle martensite. The production of pearlitic and bainitic steels is lower in cost and suffices for most applications. Martensitic steels must be tempered prior to use due to their extreme brittleness. Pearlite, Bainite and Martensite will all be produced through variations in the cooling rates of initially austenized samples. The second experiment involved in the study of the heat treatment examines is hardness test by using Rockwell tester. Overall, heat treatment has a tremendous impact on some of the properties of materials used by engineers, and the effects of heat treatment should always be considered. 1.0
Objective:
To determine the effect of heat treatment on mechanical properties of 1050 Steel.
To reveal the microstructures of 1050 steel during heat treatments.
Abstract
In this experiment, we observed how the properties of plain carbon steel vary with the heat treatment condition. We prepared six different samples in three different heat treatment configurations and performed hardness tests on them by using the Rockwell tester and observed the microscopic using optical microscope. Based on the optical microscope observation, we found that the crack is appeared at the tempering stage, because the grain size is larger compared at the austenitizing stage at higher tempering temperature. Larger grain will cause the less phase boundary area, lower strength and higher ductility which give the reasons for a crack to appear. Conventional heat treatment procedures for producing martensitic steels generally involve continuous and rapid cooling of an austenitized specimen in water and room temperature for tempered specimen. The properties of a steel that has been quenched and then tempered depends largely on the rate of cooling and tempering times and temperatures. During the quenching heat treatment, the specimen can be converted to a variety of microstructures including soft and ductile spheroidite to hard and brittle martensite. The production of pearlitic and bainitic steels is lower in cost and suffices for most applications. Martensitic steels must be tempered prior to use due to their extreme brittleness. Pearlite, Bainite and Martensite will all be produced through variations in the cooling rates of initially austenized samples. The second experiment involved in the study of the heat treatment examines is hardness test by using Rockwell tester. Overall, heat treatment has a tremendous impact on some of the properties of materials used by engineers, and the effects of heat treatment should always be considered. 1.0