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首页> 外文期刊>Materials Science and Engineering >Compressive creep of coarse-grain WC-Co and WC-TaC-Co hardmetals with uniform microstructure comprising rounded WC grains
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Compressive creep of coarse-grain WC-Co and WC-TaC-Co hardmetals with uniform microstructure comprising rounded WC grains

机译：粗粒WC-CO和WC-TAC-CO硬质合金的压缩蠕变，具有均匀的微观结构，包括圆形WC颗粒

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摘要

The creep process of coarse-grain WC-6%Co hardmetals with uniform microstructure comprising rounded WC grains undoped and doped with 0.2 wt% TaC was studied under uniaxial compressive loads in two temperature ranges of 300-500 K and 600-970 K. The amount of TaC added to WC-Co was below its solubility limit, so that the microstructure of the hardmetal doped with TaC did not contain grains of the second carbide phase (Ta,W)C of the order several microns in size. The creep activation energy in the medium-low temperature range (T = 300 ... 500 K) is quite low and lies between 13 kJ/mol and 25 kJ/mol. The activation energy noticeably increases at higher temperatures and varies from 50 kj/mol to 90 kJ/mol in the temperature range of 600-970 K. As a result of doping the WC-6%Co hardmetal with tantalum carbide the creep resistance significantly increases. In the temperature range of 600-900 K the doping leads to reducing creep rates by a factor of up to nine.
机译：在单轴压缩载荷下，在两个温度范围为300-500k和600-970k的单轴压缩载荷下，研究了包含圆形微观结构的粗粒WC-6％Co硬粒的蠕变过程，其在单轴压缩载荷下，在两个温度范围为300-500k和600-970k。该加入到WC-Co的TAC的量低于其溶解度极限，因此掺杂的硬质合金的微观结构不含尺寸尺寸的多个碳化物相（Ta，W）C的第二碳化物相（Ta，W）C的晶粒。中低温范围（T = 300 ... 500K）中的蠕变激活能量非常低，介于13kJ / mol和25kJ / mol之间。活化能在较高温度下显着增加，在600-970k的温度范围内从50kJ / mol到90kJ / mol之间变化。由于掺杂WC-6％CO硬质合金与钽碳化物蠕变抗性显着增加。在600-900k的温度范围内，掺杂导致将蠕变率降低至九倍。

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