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在1250、1300和1350℃下对50%(W50)、67%(W67)和90%(W90)轧制量的纯钨进行了等温退火实验。运用显微硬度测试和显微组织分析,研究了温度和轧制量对纯钨再结晶过程的影响。通过Arrhenius关系式拟合计算出W50、W67和W90表观再结晶激活能Q分别为478、496和447 kJ/mol,并通过外推预测出在900℃时,W50、W67和W90的使用寿命分别为172.7、72.3和8.5年。通过对1350℃等温退火后的纯钨样品完全再结晶晶粒统计分析发现,完全再结晶平均晶粒尺寸随轧制量的增加而逐渐减小。
Isothermal annealing experiments were performed on pure tungsten at 50% (W50), 67% (W67) and 90% (W90) rolling at 1250, 1300 and 1350 ° C. The effects of temperature and rolling amount on the recrystallization of pure tungsten were studied by using microhardness test and microstructure analysis. The apparent activation energy Q of W50, W67 and W90 were 478, 496 and 447 kJ / mol calculated by Arrhenius correlation fitting, and the service life of W50, W67 and W90 at 900 ℃ was predicted by extrapolation Respectively 172.7,72.3 and 8.5 years. Through the complete recrystallization grain statistical analysis of the pure tungsten sample after isothermal annealing at 1350 ℃, the average recrystallization grain size decreases with the increase of the rolling amount.