Influence of Hot Hardness and Microstructure of High‐Alloyed Powder Metallurgical Tool Steels on Abrasive Wear Behavior at Elevated Temperatures. Issue 5 (26th December 2019)

• Record Type: Journal Article
• Authors: Wulbieter, Nils; Pöhl, Fabian; Theisen, Werner
• Other Names: Broeckmann Christoph guestEditor.
• Is Part Of: Steel research international. Volume 91:Issue 5(2020)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2019-12-26
• Subjects: hot hardness -- powder metallurgy -- self–protecting layers -- tool steels -- wear at elevated temperatures; Steel -- Periodicals; Steel -- Metallurgy -- Periodicals; 669.142
• DOI: 10.1002/srin.201900461
• Languages: English
• ISSNs: 1611-3683

Abstract

Abstract : Herein, the abrasive wear behavior of different high‐alloyed powder metallurgical (PM) tool steels is investigated at elevated temperatures (400–600 °C) in a dry‐pot wear tester containing Al2 O3 particles. To identify the influence of the microstructure, PM tool steels with different hot hardnesses, carbide types, and carbide volume contents are selected. Wear tracks are analyzed by scanning electron microscopy (SEM) to clarify wear mechanisms. The results show that there is no direct correlation between wear resistance and only one material property such as hot hardness, carbide content, or carbide type. More important seems to be the best possible compromise between a sufficient hot hardness of the metallic matrix and a high volume content of carbides that are harder than the attacking abrasive particles at the respective temperature. When the test temperatures surpass the tempering temperature of the investigated steels, there is a pronounced change in wear behavior due to the stronger embedding of abrasive particles into the wear surface. It is thus necessary to discuss the microstructural properties as a function of temperature, considering interactions with the abrasive particles. Abstract : The abrasive wear behavior of powder metallurgical tool steels at 400–600 °C is investigated against motile Al2 O3 particles. At temperatures up to 500 °C, the lowest wear is achieved by materials with a high hot hardness and a high MC carbide content. At 600 °C, strong embedding of abrasive particles occurs because of rapid matrix softening.