摘要
采用原位热膨胀法,结合XRD分析研究不同Cr元素含量(1.0%,3.0%,5.0%,7.0%和9.0%,质量分数)的Ti5Mo5V3Al-Cr系合金在420,520,620℃时效过程中的相变化量与时间的关系。根据Johnson-Mehl-Avrami方程,拟合得到Ti5Mo5V3Al-Cr系合金的相关动力学参数,建立该系合金的动力学方程。通过实验结果和理论计算结果,绘制Ti5Mo5V3Al-Cr系合金的时间-温度-转变(TTT)对比曲线。结果表明:动力学方程计算结果与实验结果具有良好的一致性;1Cr和3Cr合金在实验温度范围内均具有较快的相变速率;5Cr和7Cr合金的等温相变对温度敏感,"鼻温区"在550℃左右;9Cr合金则在实验温度范围内均具有较慢的相变速率,无明显"鼻温区"。
The relationship between phase transformation and time of Ti5Mo5V3Al-Cr(Cr content is 1.0%,3.0%,5.0%,7.0%and 9.0%,mass fraction)alloys at 420,520,620℃was studied by in-situ thermal expansion and XRD method.According to the Johnson-Mehl-Avrami equation and experimental results,the kinetic parameters of Ti5Mo5V3Al-Cr alloys were obtained by fitting,and the dynamic equation of the system was established.Furthermore,based on the experimental results and theoretical calculation results,the time temperature transformation(TTT)contrast curve of Ti5Mo5V3Al-Cr alloys was plotted.The results show that the calculated results are in good agreement with the experimental results.Besides,1Cr and 3Cr alloys have a fast phase change speed in the test temperature range of 420,520,620℃;5Cr and 7Cr alloys have the fastest alpha phase transition velocity at the“nose temperature zone”of 550℃.The“nose temperature zone”of 9Cr alloy is not obvious,which means that the phase transition rate is slow.
作者
吴楠
崔雪飞
魏衍广
陶海明
罗峥
WU Nan;CUI Xue-fei;WEI Yan-guang;TAO Hai-ming;LUO Zheng(Powder Metallurgy and Special Materials Research Department, General Research Institute for Nonferrous Metals,Beijing 100088,China)
出处
《材料工程》
EI
CAS
CSCD
北大核心
2018年第9期115-121,共7页
Journal of Materials Engineering
基金
国家国际科技合作专项资助项目(2012DFG51540)
