Effects of Rare Earth on the Microstructure and Impact Toughness of H13 Steel
Effects of Rare Earth on the Microstructure and Impact Toughness of H13 Steel
复制标题
DOI：
10.3390/met5010383
复制
发表时间：
2015-03-01
期刊：
影响因子：
2.9
通讯作者：
Li, Dianzhong
中科院分区：
文献类型：
--
作者：
Gao, Jinzhu;Fu, Paixian;Li, Dianzhong
对H13钢的研究表明，在适当的条件下，稀土金属（REM）的加入可以显着提高机械性能，如冲击韧性。这种改善显然是由于REM添加后形成更细、更分散的RE夹杂物和晶粒细化。本文研究了H13钢中添加0、0.015、0.025和0.1wt. %稀土后的组织演变和力学性能。考察利用光学显微镜、扫描电镜和透射电镜对试样的晶粒尺寸、夹杂物和断口形貌进行了系统的研究。结果表明，添加0.015wt. %的REM可以显著提高材料的力学性能。与0.025重量%的REM添加剂相比，和0.1重量%。结果表明，加入0.015%的稀土元素后，冲击韧性显著提高，从10 J提高到19 J，提高了90%。稀土元素的加入可使钢中夹杂物体积分数增大，夹杂物更细小、更弥散，对韧性有很大的改善作用。
Studies of H13 steel suggest that under appropriate conditions, additions of rare-earth metals (REM) can significantly enhance mechanical properties, such as impact toughness. This improvement is apparently due to the formation of finer and more dispersive RE inclusions and grain refinement after REM additions. In this present work, the microstructure evolution and mechanical properties of H13 steel with rare earth additions (0, 0.015, 0.025 and 0.1 wt.%) were investigated. The grain size, inclusions and fracture morphology were systematically studied by means of optical microscopy (OM), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The results indicate that REM addition of 0.015 wt.% can result in good improvement of performance compared to the REM additions of 0.025 wt.% and 0.1 wt.%. It is found that the impact toughness is significantly enhanced with the addition of 0.015% REM, which can be improved 90% from 10 J to 19 J. Such an addition of REM can result in a huge volume fraction of finer and more dispersive inclusions which are extremely good to toughness.