Effect of tempering and cryogenic treatment on microstructure and tribological properties in X40CrMoV5-1 hot work tool steel

Year 2024, , 370 - 375, 15.01.2024

Fulya Kahrıman

https://doi.org/10.28948/ngumuh.1333357

Abstract

In this study, the effect of different heat treatments on the microstructure and hardness of an X40CrMoV5-1 hot work tool steel used as a mold material was investigated. Heat treatment processes were applied as austenitization, cryogenic treatment and two-stage tempering at three different temperatures. After heat treatments, the microstructures of the samples were examined with a light microscope and RockwellC hardness was measured. Then, tribological properties were investigated by applying nitriding surface treatment with gas nitriding method to certain samples selected according to tempering temperature and cryogenic treatment condition. The effect of cryogenic treatment on the tribological properties of nitrided samples was investigated with the specific wear rate and microscopic examinations as a result of the dry friction wear test. The results showed that the tribological properties of the nitrided samples in terms of specific wear rate and wear mechanism were better in the deep cryogenic treatment applied sample.

Keywords

Hot work tool steel, Cryogenic treatment, Nitriding, Tribology

X40CrMoV5-1 sıcak iş takım çeliğinde menevişleme ve kriyojenik işlemin mikroyapı ve tribolojik özelliklere etkisi

Abstract

Bu çalışmada kalıp malzemesi olarak kullanılan bir X40CrMoV5-1 sıcak iş takım çeliğinde öncelikli olarak farklı ısıl işlemlerin mikroyapı ve sertlik üzerindeki etkisi incelenmiştir. Isıl işlem prosesleri, östenitleme, kriyojenik işlem ve üç farklı sıcaklıkta iki aşamalı menevişleme olarak uygulanmıştır. Isıl işlemler sonrasında numunelerin mikroyapıları ışık mikroskobu ile incelenmiş ve RockwellC sertlikleri ölçülmüştür. Daha sonra meneviş sıcaklığı ve kriyojenik işlem durumuna göre seçilen belirli numunelere gaz nitrasyon yöntemi ile nitrürleme yüzey işlemi uygulanarak tribolojik özellikler araştırılmıştır. Nitrürlenmiş numunelerde kriyojenik işlemin tribolojik özelliklere etkisi kuru sürtünme aşınma testi uygulanarak spesifik aşınma oranı ve mikroskobik incelemeler ile araştırılmıştır. Sonuçlar, nitrürlenmiş numunelerden derin kriyojenik işlemin uygulandığı numunede tribolojik özelliklerin spesifik aşınma oranı ve aşınma mekanizması açısından daha iyi özellikler sergilediğini göstermiştir.

Keywords

Sıcak iş takım çeliği, Kriyojenik işlem, Nitrasyon, Triboloji

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