development of wear resistant steels - university of...
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University of Oulu
Development of Wear Resistant Steels Oskari Haiko Doctoral Student CASR Seminar 7.12.2016
University of Oulu
Content
7/12/16 Oskari Haiko - CASR Seminar 2
Wear Resistant Steels Wear of Steels Research Work Wear Testing Summary
University of Oulu
Wear Resistant Steels
7/12/16 Oskari Haiko - CASR Seminar 3
- Applications in mining, agriculture, transportation
- Ultra-high strength steels
- Hardness ranging from 400 HB up to 700 HB
- Martensitic microstructure
Wear resistant steels in different applications (Raex brochure by SSAB)
University of Oulu
Wear of Steels
7/12/16 Oskari Haiko - CASR Seminar 4
- Focus on abrasive and impact wear
- Based on mechanical and physical properties
- Important properties: hardness, toughness, ductility
- Surface hardness of steel: initial & worn
- Tribosystem: multiple parameters
Abrasive wear and physical properties of metals.
Zum-Gahr. Microstructure and Wear of Materials, 1987.
University of Oulu
Wear of Steels
7/12/16 Oskari Haiko - CASR Seminar 5
- Different microstructures show different wear behavior
- Single vs multi-phase microstructure: hard/soft matrix, “composite” structure
- The effect of retained austenite à Strain hardening capability
- Abrasive size and properties: sand, gravel, large rocks; soil
Steels with similar hardness level (350 HV).
B. Narayanasmy et al. Wear 350-351 (2016), pp. 155-165.
University of Oulu
Research Work
7/12/16 Oskari Haiko - CASR Seminar 6
- Abrasive and impact wear: Comparison of different microstructures
- New steel concepts: - JMAT Pro - Gleeble - Laboratory rolling
- Mechanical properties - Microstructural characterization
- Wear testing at TWC Lab rolled plate
Impeller-tumbler samples (unworn & worn)
JMAT Pro CCT
Diagram
University of Oulu
Wear Testing
Tampere Wear Center (TWC) - Characterization, wear testing and
modeling
- Application oriented
- Standard and non-standard testing
7/12/16 Oskari Haiko - CASR Seminar 7
Crushing pin-on-disk (CPOD)
Impeller-tumbler
Dry-pot tester
University of Oulu
Summary
7/12/16 Oskari Haiko - CASR Seminar 8
The aim is to distinguish which properties and features of steels are the most important for improved wear resistance - Metallurgy - Processing of steels - Material characterization - Mechanical and wear testing - Wear phenomena à New steels with extreme wear resistance Mass loss vs surface hardness
O. Haiko et al. “Processing and Wear Testing of Novel High-Hardness Wear-Resistant Steel”, NORDTRIB 2016 conference
University of Oulu
Thank you!
7/12/16 Oskari Haiko - CASR Seminar 9