An Analysis of the Reasons for Unqualified Impact Property of X80M Steel Hot Rolled Coil

LI Tao; TIAN Peng; SUN Hong; GONG Qing; LIU Zhen-wei; WANG Hai-yan; ZONG Qiu-li

Materials and Mechanical Engineering > 2014 > 38(7): 102-108.

LI Tao, TIAN Peng, SUN Hong, GONG Qing, LIU Zhen-wei, WANG Hai-yan, ZONG Qiu-li. An Analysis of the Reasons for Unqualified Impact Property of X80M Steel Hot Rolled Coil[J]. Materials and Mechanical Engineering, 2014, 38(7): 102-108.

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An Analysis of the Reasons for Unqualified Impact Property of X80M Steel Hot Rolled Coil

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Received Date: March 19, 2014

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The reasons for unqualified impact property of X80M steel hot rolled coil were analyzed by mechanical property test, chemical composition analysis, metallographic examination, energy dispersive spectroscopy and impact fracture morphology observation. The results show that the impact property of the coil was unqualified because there was severe banded microstructure, a sort of brittle microstructure mainly composed of lath martensite, in the coil. The obvious segregation of manganese and silicon was founded in the banded microstructure which was the crack source of impact coil. There were many carbonitride inclusions of niobium and titanium in the banded microstructure. The inclusions were square with a maximum size of 13 μm, which reduced the impact toughness further. The most effective method to get rid of or reduce the banded microstructure is reducing or eliminating dendritic segregation in ingot during rolling process.
- X80M hot rolled coil,
- impact property,
- banded microstructure,
- martensite,
- inclusion

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