Evolution of the microstructure and microhardness of a new wrought Ni-Fe based superalloy during high temperature aging
Evolution of the microstructure and microhardness of a new wrought Ni-Fe based superalloy during high temperature aging
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新型变形镍铁基高温合金高温时效过程中显微组织和显微硬度的演变
DOI：
10.1016/j.jallcom.2015.04.184
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发表时间：
2015
影响因子：
6.2
通讯作者：
Gu Yuefeng
中科院分区：
文献类型：
--
作者：
Zhao Xinbao;Dang Yingying;Yin Hongfei;Yuan Yong;Lu Jintao;Yang Zhen;Gu Yuefeng
研究了一种具有γ/γ‘双相结构的新型变形Ni-Fe基高温合金在750℃至3000h的高温时效过程中组织和硬度的变化，发现γ’颗粒长大为大的球形颗粒，其生长速度符合Lsw模型。除晶界附近存在小块状富铬M23C6碳化物外，未观察到其他有害相。此外，时效后的Ni-Fe合金的显微硬度在500h时效后下降了约13%，3000h时效后又下降了约21%。高温时效过程中的组织演变从γ的颗粒形态、尺寸和生长动力学等方面进行了表征，并与其显微硬度的变化进一步相关。
The changes of the microstructure and microhardness of a new wrought Ni–Fe based superalloy with γ/γ′ two-phase structure were investigated during high temperature aging at 750 °C up to 3000 h. It was found that γ′ particles grew into large ones with spherical morphology and the growth rate was consistent with the LSW model. No other detrimental phases were observed besides small blocky type Cr-rich M23C6carbides existed around grain boundaries. In addition, the microhardness of aged Ni–Fe alloy decreased about 13% in the first 500 h aging and then dropped about 21% after aging for 3000 h. The microstructural evolution during high temperature aging was characterized in terms of γ′ particles morphology, size and growth kinetics, and were further correlated with the changes of its microhardness.