CAJ | 학술논문

提出一种用原位电压法测定铝合金连续冷却转变图(CCT图)的方法.采用自主开发的设备,在恒电场作用下,测试一定尺寸的试样在保温及连续冷却过程中的电压变化曲线.根据电压一时间及电压一温度曲线,获得实验合金的最佳固溶时间、相变开始温度和相变结束温度,并确定实验合金抑制相变发生的临界淬火速率范围.根据相变信息建立实验合金的CCT图,采用透射电镜观察(TEM)和差示扫描量热(DSC)测试验证了CCT图的准确性.
제출일충용원위전압법측정려합금련속냉각전변도(CCT도)적방법.채용자주개발적설비,재항전장작용하,측시일정척촌적시양재보온급련속냉각과정중적전압변화곡선.근거전압일시간급전압일온도곡선,획득실험합금적최가고용시간、상변개시온도화상변결속온도,병학정실험합금억제상변발생적림계쉬화속솔범위.근거상변신식건립실험합금적CCT도,채용투사전경관찰(TEM)화차시소묘량열(DSC)측시험증료CCT도적준학성.
An effective method was proposed to establish the continuous cooling transformation(CCT)diagrams of aluminum alloys using in situ voltage measurement.The voltage change of samples with predefined dimension was recorded under the constant current state during continuous cooling.Solutionizing time,together with starting and finishing temperatures of phase transformation of the alloy can be obtained from relationships of voltage vs time and temperature.A critical cooling rate without detectable phase transition during continuous cooling can be determined.Continuous cooling transformation diagrams of tested samples can be established conveniently based on these results.Microstructure observation and differential scanning calorimetry(DSC)testing were applied to verify the reliability of continuous cooling transformation diagram.