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University of Oulu Development of Wear Resistant Steels Oskari Haiko Doctoral Student CASR Seminar 7.12.2016
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
