Effects of Phosphorus on Microstructure and Mechanical Properties in NiCr Alloys

Abstract:

Microstructure and mechanical properties of Ni-Cr alloys with various contents of Phosphorus (P) have been investigated. It is found that the increase of phosphorus refined dendritic structures in as-cast alloys and decreased micro-segregation of Chromium (Cr) element. α-Cr which precipitated during hot-rolling process was obviously inhibited by phosphorus because of its prior occupancy on grain boundaries and decreasing precipitation driving force of α-Cr. Tensile and impact properties were examined on samples under different heat treatments. Though the yield strength of as-rolled alloys was increased by precipitation of α-Cr, the elongation and impact energies were reduced. It is worthy to note that impact energies of samples solutioned at 950°C increased with the increasing phosphorus. The results indicated that dislocations are markedly effected by phosphorus which is probably the reason for improving impact energies.

• Periodical: Materials Science Forum (Volume 913)
• Pages: 141-149
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.913.141
• Online since: February 2018
• Authors: Xin Tong Lian*, Wen Ru Sun, Xin Xin, Dan Dan Zheng, Shou Ren Guo
• Keywords: Impact Properties, Ni-Cr Alloys, Phosphorus, Tensile Properties, α-Cr

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