When most people think about strengthening metal, they imagine high-tech alloys or heat treatments. But there’s another process that’s just as critical— shot peen . This surface treatment quietly improves the fatigue resistance of parts, prevents cracks, and keeps engines, gear systems, and turbines running longer. In this article, I’ll break down what shot peen is, how it works, and why industries worldwide depend on it. What is shot peen? Shot peen is a mechanical surface treatment where tiny spherical particles, called “shots,” are propelled at high speed against a metal surface. Each tiny impact leaves a small indentation. When millions of these impacts occur, they create a layer of compressive stress in the surface of the material. This matters because cracks in metals usually start at the surface under tensile stress . By replacing that with compressive stress, shot peen makes parts much more resistant to crack formation and growth. Think of it as giving the surface of a metal ...
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