The superior thermal stability and tensile properties of hot rolled W-HfC alloys
The superior thermal stability and tensile properties of hot rolled W-HfC alloys
复制标题
热轧 W-HfC 合金优异的热稳定性和拉伸性能
DOI：
10.1016/j.ijrmhm.2019.02.018
复制
发表时间：
2019-06-01
影响因子：
3.6
通讯作者：
Liu, C. S.
中科院分区：
文献类型：
--
作者：
Wang, Y. K.;Xie, Z. M.;Liu, C. S.
本文中，W-0.5wt%HfC（WHC 05）合金通过常规烧结和多步热轧来制备。研究了从室温到600 ℃的不同温度下的高温稳定性和拉伸性能，以证明HfC添加的影响。结果表明，WHC 05合金具有比先前报道的轧制态纯W（1200 ℃）和轧制态W-0.5wt%ZrC（WZC 05类似于1300 ℃）合金更高的再结晶温度（1400 ℃-1500 ℃）。此外，在回复和再结晶（在1600 ° C下退火）之后，WHC 05合金保持类似于300 MPa的高极限拉伸强度，并且表现出总伸长率的期望增加（> 35%），其类似于比在500 ° C下再结晶的WZC 05高1.6倍。纳米HfC颗粒在W基体中的均匀分散和独特的微观结构使其具有良好的上级热稳定性和优异的高温力学性能。研究了退火温度对纳米HfC颗粒的晶粒结构、晶粒取向和分布的影响，揭示了纳米HfC热稳定性和上级力学性能提高的可能机制。
Herein, a W-0.5wt%HfC (WHC05) alloy is fabricated by conventional sintering and multi-step hot-rolling. The high-temperature stability and tensile properties at different temperatures, ranging from room temperature to 600 degrees C, are studied to demonstrate the influence of HfC addition. The results reveal that the WHC05 alloy has a higher recrystallization temperature (1400 degrees C-1500 degrees C) than the previously reported as-rolled pure W (1200 degrees C) and as-rolled W-0.5wt%ZrC (WZC05 similar to 1300 degrees C) alloy. Moreover, after recovery and recrystallization (annealing at 1600 degrees C), the WHC05 alloy maintained a high ultimate tensile strength of similar to 300 MPa and exhibited a desirable increase in total elongation (> 35%), which is similar to 1.6 times higher than the recrystallized WZC05 at 500 degrees C. The superior thermal stability and excellent high-temperature mechanical properties can be ascribed to the unique microstructure and uniform dispersion of nano-sized HfC particles in W matrix. The influence of annealing temperature on grain structure, grain orientation and distribution of nano-sized HfC particles has been studied to unveil the possible mechanism of enhanced thermal stability and superior mechanical properties.