Effects of Electropulsing Treatment on the Precipitation Behaviour of Grain Boundary Carbides in GH3044 Alloy
Effects of Electropulsing Treatment on the Precipitation Behaviour of Grain Boundary Carbides in GH3044 Alloy
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DOI：
10.4028/www.scientific.net/msf.654-656.464
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发表时间：
2010-06
期刊：
影响因子：
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通讯作者：
Yang Liu;Lei Wang;Y. Wang;Hong Yan Liu;Xueting Chen;Yan Yu
中科院分区：
文献类型：
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作者：
Yang Liu;Lei Wang;Y. Wang;Hong Yan Liu;Xueting Chen;Yan Yu
研究了电脉冲处理对GH3044合金晶界碳化物析出行为的影响。结果表明，在频率为5Hz、脉宽为15 μ s、电流密度为10.0kA/mm~2的条件下进行脉冲处理，可以降低晶界M23C6型碳化物析出的起始温度。M23C6型碳化物的体积分数比相同温度下时效处理的大幅度提高，达到274.60%。而在45Hz、2kA/mm~2、15 μ s脉冲电流条件下，M23C6型碳化物的析出受到抑制。M23C6型碳化物的体积分数比相同温度下时效处理的降低到18.81%。研究发现，脉冲电流的电效应可以促进溶质原子在合金中的扩散。结果表明，改变了M23C6型碳化物析出的热力学条件和动力学，降低了析出的起始温度和峰值温度。
The effects of electropulsing treatment on the precipitation behaviour of grain boundary carbides in GH3044 alloy were investigated. The results showed that the initial temperature of precipitation of M23C6 type carbides on grain boundary could be decreased by electropulsing treatment under the condition of high current density of 10.0kA/mm2 with a frequency of 5Hz and pulse width of 15s. The volume percentage of M23C6 type carbide was greatly increased to 274.60% comparing with that of the aging treatment at the same temperature. However, the precipitation of M23C6 type carbide was inhibited by electropulsing treatment under the condition of high frequency of 45Hz with the current density of 2kA/mm2 and pulse width of 15s. The volume percentage of M23C6 type carbide was decreased to 18.81% comparing with that of the aging treatment at the same temperature. It has been found that the diffusion of solute atom in the alloy can be promoted by the electric effect with the electropulsing. As a result, the thermodynamic condition and kinetics of the precipitation of M23C6 type carbide were changed, and both the initial and peak temperatures of precipitation were decreased.