MICROSTRUCTURAL CHARACTERIZATION OF A Cr-Mo-W-Co HOT-WORK DIE STEEL AFTER TEMPERING.
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| Title: | MICROSTRUCTURAL CHARACTERIZATION OF A Cr-Mo-W-Co HOT-WORK DIE STEEL AFTER TEMPERING. |
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| Authors: | HA, SEONG-HO1, SHIN, YOUNG-CHUL1 ycshin@kitech.re.kr, LIM, SUNG-HWAN2 |
| Source: | Archives of Metallurgy & Materials. 2026, Vol. 71 Issue 2, p575-578. 4p. |
| Subjects: | Tempering, Microstructure, Scanning electron microscopy, Transmission electron microscopy, Electron backscattering, Chromium molybdenum steel, Carbides, Heat resistant steel |
| Abstract: | The microstructural characteristics of a Cr-Mo-W-Co hot-work die steel subjected to tempering were systematically investigated using scanning electron microscopy (SEM), electron backscatter diffraction (EBSD), and transmission electron microscopy (TEM). All analyses were conducted under a unified tempering condition of 580°C for 6 h in order to establish a coherent interpretation of the stabilized microstructural state. SEM observations revealed the presence of micrometer-scale bright particles whose size and distribution remained unchanged after tempering, indicating that they are pre-existing carbides rather than tempering-induced precipitates. EBSD analysis showed a pronounced change in local crystallographic substructure after tempering, as evidenced by an increase in kernel average misorientation, suggesting sub-grain scale rearrangement within the matrix. TEM and selected area electron diffraction confirmed the formation of crystalline precipitates with well-defined interfaces, which could not be resolved by SEM. STEM-EDS analysis further demonstrated that these precipitates are Mo-W-rich complex alloy carbides incorporating multiple alloying elements. [ABSTRACT FROM AUTHOR] |
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| Database: | Engineering Source |
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