Selecting Composition and Effects of Annealing in Direct Hardening Steels

Description

When hot steel is quenched, most of the cooling happens at the surface, as does the hardening. This propagates into the depth of the material. Alloying helps in the hardening and by determining the right alloy one can achieve the desired properties for the particular application. Such alloying also helps in reducing the need for a rapid quench cooling, thereby eliminating distortions and potential cracking. In this module a definition and process explanation of Direct Hardening Alloy Steel will be presented. The different alloy elements will be detailed. Then, with the help of the Jominy test, a characterisation of alloy hardenabillity will be studied. Finally, the effects of tempering on direct hardening alloy steels and the properties of direct hardening alloy steels will be evaluated with a graph.

What you will learn

- Define direct hardening alloy processes;outline the properties of direct hardening alloy steels;
- Outline the properties of direct hardening alloy steels;
- Select composition for direct hardening applications;
- Explain the effects of tempering and heat treatment on direct hardening alloy steels.

Module content

Related Occupations

Related Qualifications