Combination of Strengthening Mechanisms

1. Combined Strengthening: Introduction
2. Ferrite-Pearlite Steels: Formation of Microstructure
3. The Law of Mixtures
4. Strengthening by Pearlite
5. Strengthening by Pearlite II
6. The Standard Model
7. Measuring Precipitates
8. Estimating Precipitation Hardening
9. Solid Solution Hardening
10. Applications of the Linear Model
11. Alternative Models I
12. Alternative Models II
13. Combining Strengthening Mechanisms to Design Steels
14. Summary
15. Design-a-Steel Exercise

In this section, you will examine the ways in which individual strengthening mechanisms contribute to the yield strength of a given steel and how they can be used to create required combinations of strength and toughness of steels for a variety of structural applications.

There is also a wealth of information on structure/property relationships in steels in the Microalloying series of conferences, a search on the internet using microalloying will generate a large selection.

Pre-Requisites

Before starting, it is important that you are familiar with the following terms:  Yield stress; Strain ageing (External site);

You should be familiar with the concepts covered in:

• Tensile Test
• Grain Size Strengthening
• Solid Solution Strengthening
• Dislocation Strengthening
• Particle Strengthening

References

• Gladman, T,  The Physical Metallurgy of Microalloyed Steels, Institute of Materials, 0 901716 81 2 
• Baker, TN,  Future Developments in Metals and Ceramics, Institute of Materials,  
• Llewellyn, DT & Hudd, RC,  Steels, Metallurgy and Applications, Butterworths-Heinemann,  
• Pickering, FB,  Physical Metallurgy and the Design of Steels, Applied Science Publishers Ltd,  
• Leslie, WC,  The Physical Metallurgy of Steels, McGraw-Hill,