金属学报  1979, Vol. 15 Issue (3): 339-443

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Si对一种镍基变形高温合金脆性转变的影响

王允实;毕敬;关学铭;张喜章;王景韫;林树智;徐安双

EFFECT OF SILICON ON THE TRANSITION OF BRITTLENESS IN A NICKEL BASE WROUGHT SUPERALLOY

Wang Yunshi;Bi Jing;Guan Xuemin;Zhang Xizhang;Wang Jingyun;Lin Shuzhi;Xu Anshuang

王允实;毕敬;关学铭;张喜章;王景韫;林树智;徐安双. Si对一种镍基变形高温合金脆性转变的影响[J]. 金属学报, 1979, 15(3): 339-443.
, , , , , , . EFFECT OF SILICON ON THE TRANSITION OF BRITTLENESS IN A NICKEL BASE WROUGHT SUPERALLOY[J]. Acta Metall Sin, 1979, 15(3): 339-443.

摘要 参考文献 相关文章 Metrics 全文: PDF(3875 KB)   摘要: Ni-15Cr-6W-3Mo-2Al-2Ti变形高温合金的室温抗张强度、塑性和冲击性能,随着合金中Si含量的变化呈现马鞍型的变化,即在0.4—0.6％Si范围内出现一个低塑性、低拉伸强度和低冲击韧性区。造成这种现象的本质原因是由于Si含量变化改变了晶界碳化物沉淀析出顺序、析出类型、析出量和析出形态。该合金晶界碳化物析出可分为四个阶段:第一阶段,<0.1％Si时,只有单一的M_(23)C_6析出;第二阶段,>0.1％Si以后,除M_(23)C_6外,M_6C开始析出,一直到0.4％Si时增加2缓慢;第三阶段,0.4—0.6％Si时,M_6C大量析出逐渐取代M_(23)C_6;第四阶段,>0.6％Si以后,M_6C量占绝对优势,但增加幅度比第三阶段小得多。从晶界形态来看,第一、二、四阶段皆属不连续的链状形式,只有第三阶段晶界呈现连续膜状。因此,造成性能下降的原因不是因为析出M_6C,而是它的形态,当它以颗粒状分布在晶界上时是一个很好的强化相。第三阶段的不正常析出是性能下降的本质因素。本研究结果打破了只要镍基合金中MO+1/2>W>6％(重量百分比)就形成M_6C的经验判据,“Si”才是该合金碳化物沉淀析出过程的控制因素。本文还对比了冶炼工艺差别对碳化物析出过程的影响。 Abstract：The tensile strength, ductility or impact value of a wrought nickel base super-alloy Ni-15Cr-6W-3Mo-2Al-2Ti depend markedly upon the silicon content of thealloy. On plotting these mechanical properties vs the silicon content which rangesfrom 0.1 to 0.89%, a saddle shown by the existence of a minimum at about 0.4-0.6% Si occurs. There is reason to believe that such a saddle behavior may be caus-ed by the variation of mechanical properties with the type, amount and morpho-logy of carbides as well as with the sequence of carbide precipitation in the alloyas influenced by its silicon content. Thus, the amount of M_6C and M_(23)C_6 precipi-tated along the grain boundaries would appear to proceed in four stages as follows: 1. For silicon content up to 0.1%, globular M_(23)C_6 may be the sole type ofcarbide formed; 2. In the range from 0.1 to 0.4% Si, besides M_(23)C_6, M_6C begins to appearand increases with increase of silicon content. The morphology of the carbidesseems to be different, however, being in a discontinuous, blocky form; 3. In the range from 0.4 to 0.6% Si, continuous films of M_6C were present.As might be expected, this type of carbide is very detrimental to the tensile andimpact properties at room temperature. The precipitation of M_(23)C_6 was slowed downor even suppressed; 4. In the range from 0.6 to 0.89% Si, M_6C may be altered to discontinuous,blocky form, whereas M_(23)C_6 may be very much limited. In conclusion, the detrimental effect of carbide is mainly associated with itsfilm-like morphology especially along the grain boundaries. Of course, carbides ingranular form are good strengtheners. According to prevailing view, criterion for the formation of either M_6C orM_(23)C_6 in nickel base superalloys would seem to be the relative Mo and W con-tents, e. g. if Mo+1/2W>6%, M_6C will be formed. Present work indicates that si-licon plays as equally important role in the formation of M_6C besides the Mo andW contents of the wrought nickel base superalloys. 收稿日期: 1979-03-18      服务 把本文推荐给朋友 加入引用管理器 E-mail Alert RSS 作者相关文章 王允实 毕敬 关学铭 张喜章 王景韫 林树智 徐安双 44.8K 链接本文: https://www.ams.org.cn/CN/      或      https://www.ams.org.cn/CN/Y1979/V15/I3/339 [1] Miner, R. V., Met. Trans., 8A (1977) , 1949． [2] Betteridge, W. and Heslop, J., The Nimonic Alloys; and Other Nickel-Base High-Temperature Alloys, 2nd ed., Edward Arnold, London, 1974, p. 23． [3] Eieselstein, H. L., Advance in the Technology of Stainless Steels and Related Alloys, ASTM, Phil., 1965, p. 78, (Disc.). [4] Rizzo, F. J. and Buzzanell, J. D., J. Metals, (1969) , № 10, 24． [5] Sakakiara, M. and Sekino, S., Superalloys processing; Proceedings of the 2nd International Conference, 1972, Champion, Pa., New York, AIME, P. I-1． [6] 待发表工作. [7] Douglass, D. L. and Armizo, J. S., Oxid. Metals, 2 (1970) , 207． [8] Savage, W. F. and Krantz, B. M., Weld. J. (New York), 50 (1971) , 292-S. [9] Yeniscarich, W. and Fox, C. W., Effect Minor Element on the Weldability of High Nickel Alloys, WRC, N. Y., 1969, p. 24． [10] Preis, G. und Lennartz, G., Arch. Eisenhuettenw., 8 (1975) , 509． [11] Piearcey, B. J. and Smashey, R. W., Trans. AIME, 239 (1967) , 451． [12] Sims, C. T., J. Metals, 18 (1966) , 1119． [13] Dreshfield, R. L., ASM Trans. Quart., 61 (1968) , 352． No related articles found! Viewed Full text Abstract Cited   Shared      Discussed