论文部分内容阅读
研究了含硅量为1.5%(质量分数)的高硅马氏体型热作模具钢(SDH3)的内耗谱与显微结构之间的关系.实验用SDH3钢采用1060℃保温30min油冷淬火和不同回火工艺处理.试样的温度-内耗谱(TDIF)的测量在振动仪上进行,采用自由衰减法,测量温度区间为室温至750℃.实验结果表明:SDH3钢的TDIF谱线主要是Snoek峰和SKK峰这两种机制的内耗峰;随着回火温度的升高,内耗峰峰高均逐渐降低,并且峰位也发生改变;当回火温度达到650℃时,内耗峰完全消失而只剩下背景内耗;随着回火保温时间的延长,内耗峰峰高和峰位都发生变化,并从扩散控制再分配机理的角度对这些变化进行了分析讨论.
The relationship between the internal friction spectrum and the microstructure of a high-martensitic hot-work die steel (SDH3) containing 1.5% (mass fraction) silicon was studied.The experimental SDH3 steel was quenched by oil quenching at 1060 ℃ for 30 min Different tempering process.The temperature-internal-loss spectrum (TDIF) measurement of the sample was carried out on a vibrometer with a free-fall method and the measurement temperature range was from room temperature to 750 ° C. The experimental results show that the TDIF spectrum of SDH3 steel is mainly Snoek peak and SKK peak. With the increase of tempering temperature, the peak internal friction peak height gradually decreases and the peak position also changes. When the tempering temperature reaches 650 ℃, the internal friction peak disappears completely But only the background internal friction was left behind. With the extension of tempering time, the peaks and peak positions of internal friction peaks were changed, and these changes were analyzed and discussed from the point of diffusion control redistribution mechanism.