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| LAMELLAR FRACTURE CHARACTERISTICS OF MEDIUM-CARBON CrNiMoV STEEL FORGINGS |
| by Zhang Jushui (Research Institute of Daye Steel Works) |
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Cite this article:
by Zhang Jushui (Research Institute of Daye Steel Works). LAMELLAR FRACTURE CHARACTERISTICS OF MEDIUM-CARBON CrNiMoV STEEL FORGINGS. Acta Metall Sin, 1981, 17(3): 266-369.
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Abstract The lamellar fracture with streaky matt facets found in cracked surface of medium-carbon CrNiMov steel forgings has been observed by TEM. Various extracted second phases in carbon replicas from the fracture surface were identified by selected-area electron diffraction technique and EPMA. The results indicate that the fine globular α-MnS, the type-Ⅰ MnS inclusion and the thin platelet or dentritic VC were appeared, as well as the flaky complex oxides of Si and Mn, mainly as SiO_2,distributed along the direction of hot forging. The lamellar fracture characteristics relating to intercrystalline cracking is due to various second phase precipitates at its primary austenite grain boundaries. It seems that the lamellar fracture is similar to the "rocky-rock candy" one in cast steel substantially, thus,it may decrease remarkaly the transverse tensile ductility and lower moderately the impact toughness of the steel.
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Received: 18 March 1981
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