共查询到18条相似文献,搜索用时 109 毫秒
1.
2.
3.
4.
5.
6.
7.
钼铼合金的结构和性能 总被引:7,自引:1,他引:6
总结了钼铼合金研究的最新进展。典型的钼铼合金成份主要有M041Re,M044.5Re和M047.5Re。钼铼合金坯锭的制备一般采用粉末冶金和真空熔炼的方法。当铼含量低于29%时,铼在钼中固溶形成体心立方结构的α相,钼的晶格常数降低。当铼含量高于29%时,形成x相和σ相。钼铼合金合金的熔点、热性能、电性能介于纯钼和纯铼之间,铼可以提高钼的再结晶温度,降低其塑脆转变温度。铼既可以提高钼的强度,也可以大大改善其塑性。钼铼合金的加工硬化率介于纯钼和纯铼之间而靠近纯钼。 相似文献
8.
阐述了国内外近年来对钼及其合金研究的概况和应用领域,讨论了钼及其合金的制备和加工的新技术、新工艺,并对今后的钼及其合金的发展方向进行了探讨。 相似文献
9.
钼铼合金带材的组织和性能 总被引:1,自引:0,他引:1
选用熔炼的钼铼合金经过锻造、热拉、冷拉和轧制的方法制备钼铼合金带材,其规格为0.3mm宽0.03mm厚,对其组织和性能进行了研究。结果表明:加工态的拉断力是再结晶状态的2.5倍左右,为24.8N;而延伸率只是再结晶状态的1,3,为3.1%;随着退火温度的提高,钼铼合金的的拉断力直线降低,但延伸率在1723K,30min退火后却最高,金相结果表明1723K退火的钼铼合金带材发生了明显的再结晶。钼铼合金加工态拉伸时其断口表现为准解理断裂,退火后断口表现为明显的韧窝状。铼元素加入钼中,可以提高晶粒和晶粒之间的结合力,使得钼铼合金在拉伸下有很好的延伸率。同时钼铼合金在室温变形时,也容易发生孪晶变形,这一点不同于通常的钼合金。 相似文献
10.
钼合金搅拌器的制作和应用 总被引:2,自引:0,他引:2
简要介绍了钼合金搅拌器及其主要部件的研制、应用.采用粉末冶金制坯、自由锻开坯和精锻加工等工艺所制造的TZM(钛锆钼)钼合金搅拌器骨架,能满足彩色显像管玻壳熔炉中铂-铑包覆钼合金搅拌器的要求,可实现该产品的国产化,具有良好的经济效益和社会效益. 相似文献
11.
《Metal Powder Report》1993,48(12)
Worldwide consumption of tungsten and molybdenum was 44 000 tonne and 97 000 tonne, respectively, in 1988. But only a small percentage of this volume is processed to pure or alloyed semifinished or finished products. Some 6% of all molybdenum consumed (5000 to 5500 tonne) is in the form of molybdenum and molybdenum alloys. For tungsten this percentage is higher, 10% of tungsten consumed was pure tungsten or tungsten alloy products. The same amount was produced as heavy metal every year, totalling 8000–9000 tonnes of tungsten content in tungsten and tungsten based alloys including heavy metal, says Ralf Eck of Metallwerk Plansee. 相似文献
12.
13.
14.
V. Biss G. N. Kirby D. L. Sponseller 《Metallurgical and Materials Transactions A》1976,7(9):1251-1261
Chromium, molybdenum, tungsten, and tantalum have been compared with each other in regard to their influence on the occurrence of Σ phase in cast nickel-base superalloys. The compositions of the alloys were similar to the chromium-enriched matrix of alloys strengthened by λ′ precipitate, but with systematic variations in refractory-metal content. To induce precipitation of Σ phase, the alloys were aged for 3000 h at 1400?F (760?C), 1550?F (845?C), and 1700?F (925?C). Quantities of Σ phase were determined with the aid of an image-analyzing computer. On an atomic percentage basis, molybdenum, tungsten, and tantalum are equivalent with regard to the minimum concentration of each element that is necessary to cause Σ phase precipitation in 3000 h; their potency is slightly more than twice as high as that of further chromium additions above the 37.5 at. pct base chromium level. At higher refractory metal concentrations, somewhat greater quantities of Σ phase are formed by specific atomic concentrations of molybdenum and tungsten than by tantalum. Tantalum also forms large quantities of a tantalum-containing Μ phase in the as-cast ingot and a (Ni, Co)3Ta phase on aging, the volume of all precipitate being much higher than the quantity of Σ phase for the molybdenum- and tungsten-containing alloys. At any given atomic concentration of molybdenum, tungsten, or tantalum, considerably larger quantities of Σ phase are formed than by a given increment of chromium above the 37.5 at. pct base chromium concentration in Mo-W-Ta-free alloys. 相似文献
15.
16.
17.
18.
从粉末冶金烧结理论、烧结设备、烧结工艺参数及新型烧结技术等方面概述了钼及钼合金烧结技术的研究现状及进展。结论指出, 钼及钼合金烧结理论仍集中在传统粉末冶金理论体系; 烧结技术发展方向是获得全致密化、细晶、均质化的烧结坯体; 发展趋势是烧结设备及工装与粉末冶金新技术结合更为紧密, 出现更多交叉研究; 研究热点和难点是大型钼及钼合金坯件烧结致密化、微观组织均质化、细晶化及复杂烧结态异型坯件烧结过程中形状精确控制等。 相似文献