Articles By D. Scott MacKenzie, Ph.D., FASM

 

Hot Seat: Metallurgical Reasons for Grinding Cracks and Their Detection

Aggressive grinding can result in thermal damage and potential cracking of a ground part, but methods exist to detect grinding burns and cracks.


Hot Seat: Hardenability

Factors that affect hardenability and the rate of austenite transformation — carbon content, grain size, and alloying elements — can be used to calculate hardenability for comparing alloy grades.


Hot Seat: Applications of Hardenability

A method is described to either calculate the hardness in a component given the quenchant used or to select a quenchant to achieve a desired hardness at the core or surface of a part.


Hot Seat: Development of Residual Stresses During Machining and Workholding

Machining and fixturing prior to heat treatment are among the many potential sources for distortion and residual stress.


Hot Seat: Surface Engineering of Steels

Surface engineering draws upon chemistry, material science, metallurgy, tribology, and biology to enhance surface properties for improving parts.