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Journal of Failure Analysis and Prevention

, Volume 9, Issue 5, pp 397–408 | Cite as

Fracture Assessment of Martempered and Quenched and Tempered Alloy Steel

  • J. Maciejewski
  • C. Regulski
Feature

The failure analyst is often put in the position to answer whether a fracture is “abnormal” for a material or whether a material was properly heat treated. In particular, the authors have been consulted regarding low alloy steels on two specific points.

The first common question is whether a steel has been martempered per a specification, rather than quenched and tempered (Q&T), and whether the heat treatment contributed to a fracture. Martempering (sometimes termed marquenching) is a commercially available heat treatment process that quenches the material to an intermediate temperature just above the martensite start temperature, Ms, and then air cools through the martensitic transformation range to room temperature [1, 2, 3, 4]. It is important to air cool through the transformation range since rapid cooling through this range is predicted to produce residual stress patterns similar to those produced by a direct quench and negate any advantages of the process [5]. Modified...

Keywords

Intergranular Fracture Austempering Transverse Crack High Carbon Steel Microvoid Coalescence 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© ASM International 2009

Authors and Affiliations

  1. 1.Applied Technical Services, Inc.MariettaUSA

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