Abstract: The effect of nitriding of Cr10Mn9Ni0.7 alloy in mushy zone on solidification, nitrogen content and phase transformation was investigated. The results showed that the nitrogen content raised with nitriding time, and the occurrence of gas pore defects was reduced. When the nitrogen pressure was 0.1 MPa, nitrogen content increased from 0.17% to 0.23%, while the porosity declined from 1.86% to 1.37%. When the nitrogen pressure was 0.4 MPa, nitrogen content increased from 0.29% to 0.37%, while the porosity declined from 1.41% to 1.06%. The mechanism of the nitrogen content improvement by nitriding in mushy zone can be ascribed to the facilitation of peritectic reaction and diffusion of nitrogen from liquid into austenite. The increase of the nitrogen content of channel like austenite in the residual liquid is another reason for the nitrogen content improvement. Melt holding in mushy zone can avoid the “ferritic trap”, and thus reduce the occurrence of the gas pore defects.
金青林, 汪洋, 曹磊, 宋群玲. 糊状区渗氮对Cr10Mn9Ni0.7合金氮含量及凝固相变过程的影响[J]. 《材料导报》期刊社, 2018, 32(4): 579-583.
JIN Qinglin, WANG Yang, CAO Lei, SONG Qunling. Effect of Nitriding in Mushy Zone on the Nitrogen Content and Solidification Transformation of Cr10Mn9Ni0.7 Alloy. Materials Reports, 2018, 32(4): 579-583.
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2018, Vol. 32 
