电磁连铸对Incoloy800H合金铸坯内TiN分布和内裂纹的影响

发布时间：2018-06-19 20:59

本文选题：IncoloyH合金 + 电磁场　；参考：《金属学报》2017年01期

【摘要】：研究开发了Incoloy800H耐腐蚀合金立式电磁连铸制备方法,成功制备出截面为100 mm×100 mm的Incoloy800H连铸坯,并研究了其内部凝固组织、内部裂纹和TiN分布等物理现象。结果表明,常规立式连铸Incoloy800H铸坯的内部组织粗大、存在严重的内部裂纹和大量TiN夹杂物;采用立式电磁连铸后,制备的Incoloy800H合金连铸坯的中心等轴晶率从2.45%增加至41.45%,且中心等轴晶的平均晶粒尺寸由10.83 mm减小至1.28 mm,并有效地消除了内部裂纹。TiN数量与分布的研究结果表明,立式电磁连铸条件下,铸坯中心的大尺寸TiN(大于2μm)数量由3.71×10~(-4)μm~(-2)降至1.59×10~(-4)μm~(-2),使易于诱发内裂纹的TiN数量显著减少,并抑制了TiN团簇的形成,有助于枝晶间的液态合金的补缩;另一方面,电磁连铸促使Incoloy800H合金连铸坯形成细小的等轴晶,减轻了合金元素偏析并减少了大尺寸TiN的数量,从而减少了萌发裂纹的机率,有效地抑制了内部裂纹的形成。
[Abstract]:The preparation method of incoloy 800H corrosion resistant alloy vertical electromagnetic continuous casting was developed. The incoloy 800H continuous casting billet with a cross section of 100mm 脳 100mm was successfully prepared, and the physical phenomena such as solidification structure, internal crack and tin distribution were studied. The results show that the internal structure of incoloy 800H billet is coarse, there are serious internal cracks and a large number of tin inclusions in conventional vertical continuous casting incoloy 800H billet. The central equiaxed crystal ratio of incoloy 800H alloy continuous casting billet was increased from 2.45% to 41.45%, and the average grain size of central equiaxed crystal decreased from 10.83 mm to 1.28 mm. Under the condition of vertical electromagnetic continuous casting, the amount of large size tin (> 2 渭 m) in the center of the billet is reduced from 3.71 脳 10 ~ (-4) 渭 m ~ (-2) to 1.59 脳 10 ~ (10) ~ (-4) 渭 m ~ (-2) 渭 m ~ (-1) of tin, which can reduce the number of tin easily induced internal cracks, restrain the formation of tin clusters, and contribute to the filling of liquid alloy between dendrites, on the other hand, Electromagnetic continuous casting induces the formation of fine equiaxed crystals in incoloy 800H alloy continuous casting billet, reduces the segregation of alloying elements and reduces the amount of tin in large size, thus reducing the probability of germination cracks and effectively inhibiting the formation of internal cracks.
【作者单位】：东北大学材料电磁过程研究教育部重点实验室;
【基金】：国家自然科学基金项目No.50834009 教育部科学技术研究重大项目No.311014 高等学校学科创新引智计划项目No.B07015~~
【分类号】：TG249.7

【相似文献】