Effect of tungsten content on microstructure and quasi-static tensile fracture characteristics of rapidly hot-extruded W-Ni-Fe alloys

被引：59
作者：
Gong, X. [1 ]
Fan, J. L. [1 ]
Ding, F. [1 ]
Song, M. [1 ]
Huang, B. Y. [1 ]
机构：
[1] Cent S Univ, State Key Lab Powder Met, Changsha 410083, Peoples R China
来源：
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS | 2012年 / 30卷 / 01期
关键词：
Tungsten content; Tungsten heavy alloys; Hot extrusion; Microstructure; Fracture characteristics; HEAVY ALLOY; MECHANICAL-PROPERTIES; HYDROSTATIC EXTRUSION; PLASTIC-DEFORMATION; GRAINED TUNGSTEN; STRAIN-RATE; BEHAVIOR; TORSION; COMPRESSION; ULTRAFINE;
D O I：
10.1016/j.ijrmhm.2011.06.014
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Tungsten heavy alloys (WHAs) with three different compositions (90W-7Ni-3Fe, 93W-4.9Ni-2.1Fe and 95W-3.5Ni-1.5Fe, wt.%) were heavily deformed by one-pass rapid hot extrusion at 1100 degrees C with an extrusion speed of similar to 100 mm/s and an extrusion ratio of similar to 3.33:1. The influence of tungsten content on the microstructure and tensile fracture characteristics of the as-extruded alloys was investigated in detail. The results show that the tungsten particles in the as-extruded 95W have the largest shape factor compared to the as-extruded 90W and 93W alloys and this implies that the tungsten particles in the as-extruded 95W alloy were subjected to the heaviest plastic deformation. In addition, ultimate tensile strength (UTS) and hardness (HRC) are significantly improved after rapid hot extrusion. The as-extruded 95W alloy processes the highest strength (1455 MPa) and hardness (HRC40) but the lowest elongation (5%), followed by the as-extruded 93W (UTS1390MPa; HRC39; 7%) and 90W alloys (UTS1260MPa: HRC36; 10%). The fracture morphology shows the distinct fracture features between the as-sintered alloys and the as-extruded alloys. For the as-sintered alloys, the fracture modes are various while transgranular cleavage of tungsten particles is the main characteristic in the as-extruded alloy. Meanwhile, the fracture modes of the three as-extruded alloys vary slightly with the tungsten content. TEM bright field images indicate that many lath-like subgrains with the width of 150-500 nm are present in the three as-extruded alloys, particularly in the as-extruded 93W and 95W alloys. Furthermore, the dislocations are absent in the gamma-(Ni, Fe) phase. This means that dynamic recovery-recrystallization process took place during rapid hot extrusion. (C) 2011 Elsevier Ltd. All rights reserved.
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页码：71 / 77
页数：7
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