Effects of ZrC content on the mechanical properties and microstructures of hot-rolled W-ZrC composites
Effects of ZrC content on the mechanical properties and microstructures of hot-rolled W-ZrC composites
复制标题
ZrC含量对热轧W-ZrC复合材料力学性能和显微组织的影响
DOI：
10.1016/j.nme.2019.100705
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发表时间：
2019-08-01
影响因子：
2.6
通讯作者：
Liu, C. S.
中科院分区：
文献类型：
--
作者：
Wang, R.;Xie, Z. M.;Liu, C. S.
本文采用球磨、烧结和多步热轧工艺制备了W-0.2wt%ZRC和W-0.8wt%ZRC(以下简称WZC02、WZC08)块体板材。通过对材料的显微组织、力学性能和热稳定性的研究，论证了氧化锌含量对材料性能的影响。维氏硬度和拉伸试验结果表明，与WZC02合金相比，WZC08合金具有更高的硬度、更高的抗拉强度和更低的塑性。WZC02和WZC08合金的塑性脆性转变温度(DBTT)都在300℃左右，轧制时WZC08的再结晶温度在1500℃~1600℃之间，比轧制时的WZC02高200℃。EBSD结果表明，轧制后的WZC02和WZC08合金均存在较强的[101]织构。显微组织分析表明，与WZC08相比，热轧WZC02中的ZRC弥散相颗粒尺寸更小，分布更均匀，但数密度更低。通过与纯W和WZC05的对比，提出了一种最佳的ZRC加入量，使其具有较高的抗拉强度、良好的延性和较高的热稳定性。
In this paper, bulk W-0.2 wt% ZrC and W-0.8 wt% ZrC (hereafter abbreviated as WZC02, WZC08, respectively) plates were fabricated by ball milling, sintering and multi-step hot rolling technology. The microstructure, mechanical properties and thermal stability were studied to demonstrate the influence of ZrC contents. The results of Vickers hardness and tensile tests show that the WZC08 alloy has a higher hardness, larger tensile strength but lower ductility than that of the WZC02 alloy. The ductile brittle transition temperature (DBTT) of both WZC02 and WZC08 alloys are about 300 degrees C. The recrystallization temperature of the as-rolled WZC08 is between 1500 degrees C and 1600 degrees C, which is 200 degrees C higher than that of the as-rolled WZC02. The EBSD results indicate that there are strong [101] texture in both rolled WZC02 and WZC08 alloys. Microstructural analysis shows that the ZrC dispersion particles in as-rolled WZC02 have smaller particle sizes and uniform distributions but lower number densities than that in WZC08. By comparing with the pure W and WZC05, an optimal ZrC content is proposed to achieve a better comprehensive property including high tensile strength, good ductility and high thermal stability.