The existence and strengthening mechanism of phosphorus in Ni17Cr15Fe-based alloys
作者： Chaochao Xue , Fang Liu , Xiaoyu Yao , Dongyan Liu , Xin Xin
DOI: 10.1016/J.MSEA.2020.140044
关键词: Intergranular corrosion 、 Materials science 、 Carbide 、 Transgranular fracture 、 Quenching 、 Precipitation (chemistry) 、 Grain boundary 、 Metallurgy 、 Precipitation hardening 、 Superalloy
摘要: Abstract In this paper, the existing form of phosphorus (P) and its strengthening mechanism in simplified alloys Ni-17%Cr-15%Fe were investigated. Two different post heat treatments applied on as solutionized order to investigate precipitates their effects mechanical properties. For water quenched alloys, no precipitated compounds observed either at grain boundary or within grain, rupture strength was enhanced, tensile fracture mode transformed from mixture intergranular transgranular single fracture, which indicated segregation P atoms along strengthened boundary. with additional further aging 800 °C for 8 h subsequent quenching, facilitated precipitation intragranular M23C6 carbide thus effectively improved. The results quantitative chemical element analysis qualitative TEM/EDS that enriched carbide. At same time, amount increased an increase content morphology short rod granular particle gradually, resulting strengthening. findings state are critical importance, will provide useful information interpreting beneficial effect Ni-based superalloys.
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