Heat Treatment of Mild Steel

Topics: Austenite, Steel, Rockwell scale Pages: 13 (2839 words) Published: April 7, 2014
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 Introduction
The automobile is a typical industrial product that involves a variety of materials and technologies. The present societal needs necessitate that vehicle weight reduction be achieved through the use of relatively lighter materials. However, in spite of the increased use of aluminum and plastics, iron and steel content of a modern vehicle continues to be as high as 70%. Metallic materials are ideally suited for applications in heavily stressed components that require high durability. The degree of functionality and component performance is strongly tied to the effectiveness of the processing technology deployed for a given application.

Body parts are usually produced from steel sheets that have been rolled and thermally processed to create the desired properties. The heavier body part components are manufactured through a process traditionally characterized by stamping, welding and coating leading up to the assembly process. Automotive gears represent another important category of components that are heavily stressed and require high levels of performance in the areas of both fatigue and wear resistance. Effective and appropriate heat treatment and surface modification technologies are utilized to optimize properties of virtually all types of metallic components with durability featuring prominently in a great number of applications. Beginning with raw metal products leading all the way to final component assembly, various types of heat treatment and surface engineering processes are applied in the manufacture of automotive components. Heat treatment processes impart the required strength or hardness properties as dictated by the given component application. Other processes involved in metal processing may include forming, machining as well as quench and tempering, carburizing and hardening and nitriding during production. Surface modification, when properly applied, yields optimum surface properties enhancing corrosion and wear resistance while...
Continue Reading

Please join StudyMode to read the full document

You May Also Find These Documents Helpful

  • Essay on Heat Treatment of Steel
  • Steel and Heat Treatment Essay
  • Essay about Heat Treatment of Aluminium
  • Essay about tensile test of aluminum and mild steel
  • Heat Treatment and Qualitative Metallographic Analysis Lab Essay
  • The heat Essay
  • Carbon Steels Essay
  • Essay about Heat

Become a StudyMode Member

Sign Up - It's Free