CAJ | 학술논문

研究电磁场和钙微合金化对连铸造过程中变形镁合金微观组织和力学性能的影响.利用金相显微镜(MEF-4A)、X射线衍射仪(XRD-6000)、扫描电镜(JSM-5600LV)和电子探针(EPMA-1600)对制备的连铸造锭微观组织、相组成和元素分布进行分析,并利用MTS NFW-810型试验机对连铸造锭的力学性能进行考察.结果表明:电磁场和钙微合金化复合作用能连续铸造出表面光滑、无氧化夹杂和偏析瘤的高质量铸锭,合金的微观组织得到改善,施加电磁场和钙微合金化后变形镁合金AZ61连铸锭具有晶粒细小、析出相弥散分布的均匀组织;电磁场和钙微合金化均能提高变形镁合金AZ61的抗拉强度,合金的最大抗拉强度值达到259.4MPa,较直冷连铸AZ61镁合金的提高24.2%;但钙微合金化不利于提高AZ61镁合金的伸长率.
연구전자장화개미합금화대련주조과정중변형미합금미관조직화역학성능적영향.이용금상현미경(MEF-4A)、X사선연사의(XRD-6000)、소묘전경(JSM-5600LV)화전자탐침(EPMA-1600)대제비적련주조정미관조직、상조성화원소분포진행분석,병이용MTS NFW-810형시험궤대련주조정적역학성능진행고찰.결과표명:전자장화개미합금화복합작용능련속주조출표면광활、무양화협잡화편석류적고질량주정,합금적미관조직득도개선,시가전자장화개미합금화후변형미합금AZ61련주정구유정립세소、석출상미산분포적균균조직;전자장화개미합금화균능제고변형미합금AZ61적항랍강도,합금적최대항랍강도치체도259.4MPa,교직랭련주AZ61미합금적제고24.2%;단개미합금화불리우제고AZ61미합금적신장솔.
The continuous cast of wrought magnesium alloy AZ61 with or without electromagnetic field and microalloying of Ca was investigated. The microstructures and mechanical properties of the billets were analyzed by MEF-4A metallographic microscopy, XRD-6000 diffractometry, JSM-5600LV scanning electron microscopy, EPMA-1600 electron probe microanalyser and MTS NEW-810. The results show that the billets prepared by electromagnetic cast (EMC) and microalloying of Ca have smooth surface, and the defects, such as segregation and trapped oxide, on the billet surface can be eliminated. The microstructure is improved through applying electromagnetic cast (EMC) and microalloying of Ca,the refined grains and β-Mg_(17)Al_(12) phases with small size are observed. The electromagnetic field and microalloying of Ca can improve the tensile strength, and the yield strength of AZ61 billet is 259.4MPa, increased by 24.2% compared with that of AZ61 billet by direct cold casting (DCC), but microalloying of Ca is disadvantageous to increasing the elongation of AZ61 magnesium alloy.