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High-temperature mechanical properties of wear-resistant plate continuous casting billets
Quality problems such as surface cracks or corner cracks often occur in wear-resistant plates during the continuous casting process. The cooling rate of the continuous casting billet, equipment conditions and operating techniques may all be factors that affect the occurrence of cracks in the billet, but the high temperature performance of the continuous casting billet is the key factor in the occurrence of cracks in the billet. Fully understanding the high-temperature characteristics of wear-resistant plates can provide a basis for establishing its continuous casting process parameters and improve the quality of its continuous casting billets.
In order to avoid and reduce surface cracks on the wear-resistant plate continuous casting billet, scientific researchers used the Gleeble-1500 thermal simulation testing machine to test the high-temperature mechanical properties of the wear-resistant plate continuous casting billet, and obtained its hot ductility in the range of 650 to 1350 ℃. and high temperature strength properties.
The test results show that the high-temperature strength of wear-resistant plate continuous casting billet is low, and its high-temperature strength decreases with the increase of temperature. The plastic range of the wear-resistant plate is only in the temperature range of 1000-1100 ℃, and the area shrinkage of the samples in this temperature range is greater than 90%; the low plasticity range of the wear-resistant plate is wider, and the third brittle temperature range is 700-950 ℃, the main reason is the segregation of boron at the grain boundary and the embrittlement of the grain boundary after the second phase particles such as BN precipitate; the remelting of local areas also reduces the plasticity of the wear-resistant plate in the temperature range of 1150 ~ 1250 ℃ .
