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Characteristics of Impulse Carburization LPC Process.
Ryszard Filip1, Kamil Ochał1, Kamil Gancarczyk1
1Department of Materials Science, Faculty of Mechanical Engineering and Aeronautics, Rzeszow University of Technology, Powstancow Warszawy 12, 35-959 Rzeszow, Poland.
Materials (Basel, Switzerland)
|August 7, 2021
Summary
Impulse carburizing of Pyrowear53 steel created a 1200 µm layer with decreasing hardness and carbon content. Unique compressive stress peaks were observed due to dual martensite transformation fronts.
Area of Science:
- Materials Science
- Metallurgy
- Surface Engineering
Background:
- Pyrowear53 steel is a high-performance alloy used in demanding applications.
- Thermochemical treatments like carburizing are crucial for enhancing surface properties.
- Understanding the resulting microstructure and stress states is vital for predicting performance.
Purpose of the Study:
- To investigate the effects of impulse carburizing on Pyrowear53 steel.
- To analyze the resulting carburized layer's properties, including hardness, carbon content, and residual stresses.
- To elucidate the mechanisms behind the observed residual stress distribution.
Main Methods:
- Impulse carburizing (LPC) followed by quenching and tempering.
- Measurement of hardness, carbon content, and residual austenite.
- Analysis of residual stress profiles using appropriate techniques.
Main Results:
- Formation of a ~1200 µm thick carburized layer.
- Continuous gradient observed in hardness, carbon content, and residual austenite.
- A distinct zone of elevated compressive stresses found between 600-1000 µm depth.
Conclusions:
- The observed stress anomaly is attributed to two distinct martensite transformation fronts.
- This phenomenon is linked to the carbon content gradient and its effect on the martensite start temperature.
- The specific stress profile is characteristic of Pyrowear53 steel with 0.8-0.4 wt% carbon.
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