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Influence of Cr element on impact fracture process of ductile ni-resistant alloyed iron at low temperature

China Foundry 2016年第1期13卷 42-46页

作者： Ke Jiang Ying-dong Qu Jun-hua You Rong-de Li Qing-chun Xiang Yu-xiong Zhou School of Materials Science and Engineering Shenyang University of Technology

In this study, in order to investigate the influence of Cr element on the impact fracture process of ductile ni-resistant alloyed iron at low temperature, different contents of Cr element were added to ductile ni-resistant(DNR) austenitic alloyed iron. The experimental results show that Cr addition can increase the hardness of the DNR alloyed iron, but it has an destructive effect on low-temperature impact properties. Through the analysis of the dynamic load and absorbed energy of samples with different Cr contents in the impact fracture process, and the comparison of the impact fracture process at room and low temperatures, it reveals that Cr addition into the DNR alloyed iron can facilitate the formation of the carbide mixture in Mn23C6 and Cr23C6 with homogeneous and discontinuous distribution. Meanwhile, Cr addition also can improve the the maximum dynamic load and crack initiation energy at low temperature, but has no obvious effect on the yield behavior of the DNR alloyed iron in the impact fracture process. Compared with the impact crack propagation process at room temperature, the metastable propagation energy at low temperature declines significantly with an increase in Cr content. This is because the micro-cracks that caused by the carbides weaken the matrix, resulting in the decline of impact crack propagation resistance. The fracture analysis results also show that the impact fracture mechanism gradually transforms from ductile to brittle with an increase in Cr content at low temperature. It explains that too much Cr addition can lead to brittle fracture even though the austenitic matrix has a good toughness at low temperature.

关键词： ni-resistant alloyed iron carbide impact fracture low temperature Cr addition

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