研究目的
To clarify the difference between the surface relief effects of Widmanst?tten ferrite (WF) and bainitic ferrite (BF) associated with their transformations from austenite in a low-carbon steel.
研究成果
The surface relief induced by BF exhibits many features clearly explained by PTMC, while that induced by WF shows features more reasonably explained by considering a reconstructive transformation.
研究不足
The study focuses on a specific low-carbon steel alloy and may not be directly applicable to other materials. The distinction between WF and BF based on transformation temperatures might not capture all differences between these microstructures.
1：Experimental Design and Method Selection:
In-situ measurement by digital holographic microscopy (DHM) was employed to observe the surface relief effects of WF and BF.
2：Sample Selection and Data Sources:
Specimens of Fe-
3：15C-44Mn (wt%) alloy were used. List of Experimental Equipment and Materials:
DHM system, AFM, EBSD analysis equipment, infrared heating box, R-type thermocouple.
4：Experimental Procedures and Operational Workflow:
Specimens were heat-treated in an argon-3% hydrogen mixed-gas atmosphere, and the surface relief was measured in-situ by DHM.
5：Data Analysis Methods:
The ratio of the height to the width of the surface relief was analyzed and compared with the value estimated by PTMC.
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