A comparative study of salt-bath nitrocarburizing and gas nitriding followed by post-oxidation used as surface treatments of H13 hot forging dies

作者：Perez Marcos^*; Javier Belzunce Francisco

来源：Surface and Coatings Technology, 2016, 305: 146-157.

DOI：10.1016/j.surfcoat.2016.08.003

• Wear
• Hot forging
• AISI H13
• Salt-bath nitrocarburizing
• Nitriding plus post-oxidation

The use of surface treatments is essential to increase the in-service lifetime of hot forging dies due to their improvement in terms of wear and fatigue resistances. Two thermochemical surface treatments (salt-bath nitrocarburizing and nitriding followed by post-oxidation) applied to a H13 steel have been studied in this paper. The effect of a deep cryogenic treatment on wear resistance has also been assessed.
It was shown that the two applied surface treatments markedly improved the wear resistance of the steel as a result of surface hardening and the compressive residual stress field thus induced, along with the formation of surface layers of nitrides and oxides with excellent tribological features. These surface treatments also led to good performance when tested at high temperature simulated working conditions: no relevant stress relaxation and softening, until 500 degrees C, but gradual stress relaxation and partial softening after prolonged exposure at 600 degrees C was observed. Furthermore, th

• 出版日期2016-11-15