Back to basics: the metallurgical foundations of plastic deformation processes

Why can two seemingly similar materials behave differently during wire drawing? What determines the ductility, work hardening, and formability of a metal? What role do crystal structure, iron allotropy, and phase diagrams play in manufacturing processes?

These questions are answered not by machines or equipment, but by the structure of the materials themselves. Behind every metal forming process lies a complex interaction between crystal structure, lattice defects, grain size, and microstructural transformations, all of which determine how a metal behaves during processing.

With the second installment of the Back to Basics series, Eng. Sergio Rusconi takes readers into the heart of metallurgy, exploring the fundamental principles behind plastic deformation processes.

Looking inside the material

After tracing the origins and evolution of wire drawing in the first article, the focus now shifts to the phenomena that govern the behavior of metals during plastic deformation.

This new technical paper introduces some of the key concepts of metallurgy, covering topics such as metallic bonding, crystal structures and their direct influence on the ductility and formability of metals, grain formation during solidification, and its impact on the mechanical properties of materials. It also examines iron allotropy, the mechanisms of work hardening and recrystallization—two fundamental processes in cold working—as well as phase diagrams, essential tools for understanding the behavior of alloys during heat treatment and manufacturing operations.

The objective is not to address individual processes in isolation, but to provide an integrated knowledge base that enables readers to interpret microstructure as the key to understanding the behavior of metals during processing—an essential approach for professionals involved in wire drawing and metal forming.

We would like to thank Eng. Sergio Rusconi for his valuable contribution to this project. Follow the series to stay updated on upcoming installments—the next articles will explore dislocations and the mechanisms of plastic deformation at the lattice level.