Transactions of Materials and Heat Treatment

Title：Research on microstructure and performance of die steel H13 produced by gas-protective ESR furnace

Authors： Du Yingqi Sun Jianlin Zheng Yaxu Jiang Fang

Unit： University of Science and Technology Beijing Xingtai Iron and Steel Co. Ltd.

KeyWords： ESR gas-protective H13 die steel impact toughness

ClassificationCode：TG142.41

year,vol(issue):pagenumber：2015,40(11):71-76

Abstract：

Die steel H13 with diameter of Ф600 mm was produced by gas-protective retracting-type ESR furnace in Xingtai Iron and Steel Corporation, and it was forged into parts of different specifications. The influence of melt rate and forging process on structure and impact toughness of H13 were studied. The results show that when the melt rate is between 400-550 kg·h-1, there are dendrite micro segregation and eutectic carbides in H13 ESR ingot. When the melt rate is up to 500 kg·h-1, dendrite micro segregation is lighter, the size of eutectic carbide in H13 ESR ingot is smaller and its number is less. The ingot which was produced by melt rate 500 kg·h-1 was forged by different processes. The results show that when the ingot is forged by single direction deformation, there are obvious banded structure and casted needle ferrite without broken dendrite; when it is forged by one forging and one pull deformation, the ferrite structure becomes equiaxed shape gradually and distribution of carbides comes more homogeneous. However, chained carbides separates out on the boundary of grain and banded structure is not completely eliminated; when it is forged by three-forging and three-pull multi-direction deformation, dendrite is broken sufficiently, banded structure is eliminated, granular pearlite and carbide are fine and uniform in annealing organization after forging, and the transverse impact toughness is obviously improved up to 15.5 J·cm-2.

Funds：

国家自然科学基金资助项目（51174020）

都影祁（1975-），男，硕士，高级工程师郑亚旭（1984-），女，硕士，工程师

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