Uniform heat treatment process for hardening steel

Details Uniform heat treatment process for hardening steel Uniform heat treatment process for hardening steel

2011-03-08

2011-03-08

Wyszomierski, George (Department: 1793)

Metal treatment

Process of modifying or maintaining internal physical...

Heating or cooling of solid metal

C148S714000, C432S010000, C432S226000

Reexamination Certificate

active

07901523

ABSTRACT:
Heat treatment processes for hardening a workpiece such as a turbine blade include attaching a spacer to a workpiece surface, wherein the spacer comprises an inner profile mirroring the workpiece surface and an outer profile effective to generally uniformly distribute heat to the workpiece surface, heating the spacer to uniformly heat the workpiece surface at a temperature effective to form an austenitic microstructure in the workpiece surface, cooling the workpiece surface at a rate effective to transform the austenitic microstructure to a martensitic microstructure, and removing the spacer from the workpiece prior to or subsequent to cooling.

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M.K. Lee et al, Effects of the surface temperature and cooling rate on the residual stress in a flame hardening of 12Cr steel, Journal of Materials Processing Technology, vol. 176 (published Apr. 27th, 2006), p. 140-145.
Flame Hardening of Steels, Mechanical Engineer, http://www.pageranknet.com/mechanical-engineer.mechanical-engineer-archives/15-flam . . . , 25 pages, Published May 12, 2007.

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