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.

Hot Seat: Heat Treatment of AISI 52100 For Bearing Applications

Manufacturing a component is oftentimes extremely complex, even when that component seems as simple as a bearing.

Hot Seat: Surface Engineering of Steels: Understanding Carburizing

Carburizing is a widely used, effective technique to increase surface hardness of steel used in gears, and achieve a compressive residual stress. There are several methods, and hotter isn’t always better.