Emerging technologies are focusing on the deposition methods of coating the steel surface with a hard metal (or combinations of metals).

Salt-bath nitriding is a low-temperature operation utilizing cyanide-based salts, and the die is nitrided in the molten salt.

The surface treatment of H13 hot-work tool steel for extrusion and forging dies is a technique that has been practiced for many years to extend the performance of the die surface. Many different methods of surface treatment have been tried with varying degrees of success.

Here is the conclusion of this series on surface cracking of the compound layer of a gas-nitrided component.

The early and original process can still be used as the measurement of the thermal decomposition of the ammonia process gas. This method employs the simple measurement of dissociation of the ammonia process gas.

It is most interesting to note that the process technology of gaseous nitride is still being used in today’s surface-treatment processing world.

This is the conclusion to David Pye's blog on retained austenite.

The company is using the Alnor dew-point test unit. The Alnor unit has been in the heat-treatment industry since the mid-1920s.

While in the U.K. on metallurgical consulting assignments, the writer was presented with a problem of varying surface hardness due to inconsistent formations of retained austenite on repeated batches of carburized and hardened heat-treated components.

This is a continuation of part 3, which can be found here.