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With heat treating, we push metallurgical limits to maximize material performance and prepare parts for a life of heavy service. But it doesn’t come without risk. Hypervigilance around the conditions that cause cracking from design to production is key for preventing defects that compromise critical parts.  

In this guide, we delve into the various factors contributing to crack formation and how to effectively manage risk of cracking during heat treatment.

Part 1

Conditions That Cause Cracking

Part 2

Understanding Thermal Expansion

Part 3

Design for Crack Prevention

Part 4

Heat Treating Process Recommendations

Part 5

Partners in Crack Risk Mitigation


Part 1

Conditions That Cause Cracking

Cracking most commonly occurs at the surface of a part when stresses at the surface become greater than the strength of the hardened material. Surface stress builds during the transformative phases of heat treatment as part undergoes metallurgical changes, along with expansion and contraction in response to the heat. These conditions can be influenced by several factors, including part design and quench rate, and can easily be avoided.

In this guide, we discuss:

  • The nature of metal parts and thermal expansion
  • How parts expand and behave during heat treatment
  • Design characteristics and considerations for lowering crack risk

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