金属学报  1980, Vol. 16 Issue (1): 53-132

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6Cr4Mo3Ni2WV工模具钢二次硬化过程的透射电镜观察

俞学节

上海钢铁研究所

A TEM OBSERVATION OF THE SECONDARY HARDENING PROCESS IN A 6Cr4Mo3Ni2WV DIE STEEL

Yu Xuejie Shanghai Institute of Iron ond Steel Research

俞学节. 6Cr4Mo3Ni2WV工模具钢二次硬化过程的透射电镜观察[J]. 金属学报, 1980, 16(1): 53-132.
. A TEM OBSERVATION OF THE SECONDARY HARDENING PROCESS IN A 6Cr4Mo3Ni2WV DIE STEEL[J]. Acta Metall Sin, 1980, 16(1): 53-132.

摘要 参考文献 相关文章 Metrics 全文: PDF(2539 KB)   摘要: 用电镜薄膜技术研究了6Cr4Mo3Ni2WV基体钢的淬火和回火态的组织结构,着重观察了硬度-回火温度曲线峰值附近的结构,指出合金的二次硬化主要由V_4C_3和M_2C沉淀产生.回火时沿马氏体内孪晶界和{112}晶面析出的片状渗碳体,低于450℃是稳定的,高于500℃是亚稳相,它在回火过程中转变为V_4C_3,M_2C和新的细化渗碳体,这对二次硬化也有贡献;但更主要的是这种转变使合金的冲击韧性α_K值显著提高.在600—650℃亚稳渗碳体的转变区复合转变为M_6C和Cr_7C_3,同时沿原始奥氏体晶界和亚晶界析出连续的等轴M_6C和Cr_7C_3,这一过程又使α_K值下降. Abstract：The microstructure changes in the tempering process of a quenched 6Cr4Mo3Ni2WV Matrix steel have been studied by TEM. Special attention has been paidto the observation of the microstuctures near the peak of the hardness-temperingtemperature curve. It is shown that, the secondary hardening of the steel is main-ly brought about by the precipitation of V_4C_3 and M_2C. With the tempering tempera-ture below 450℃ or so, the cementite lathes precipitated at the twin boundariesand {112} planes are fairly stable. However, they are transformed into a meta-stable phase, and finally are replaced by V_4C_3 M_2C and a new fine cementitewhen the tempering temperature is raised to beyond 500℃ This process certainlyleads to an increase in strength (secondary hardening), and what is more, it leadsto a substantial improvement in impact toughness in the meantime. The best impacttoughness is obtained by the time the cementite lathes are completely trans-formed. When tempering in the range of 600-650℃, the V_4C_3, M_ and alsothe fine cementite coalesced to equiaxed particles-M_6C or Cr_7C_3 at the austeniticgrain and sub-grain boundaries, and the impact toughness of the steel drops ac-cordingly. 收稿日期: 1980-01-18      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 俞学节 44.8K 链接本文: https://www.ams.org.cn/CN/      或      https://www.ams.org.cn/CN/Y1980/V16/I1/53 [1] 肖纪美,高速钢的金属学问题,冶金工业出版社,1976年. [2] Tekin. E. and Kelly, P.M., Precipitation from Iron-Base Alloys, Ed. by G.R. Speich and J.B. Clark, Gordon and Breach, New York, 1963,p. 173． [3] Marder, A.R., Benscoter, A.O. and Krauss, G., Met. Trans., 1 (1970) , 1545． [4] Kelly, P.M., and Nutting, J., J. Iron Steel Inst., 197 (1961) , 199． [5] 陈乾惕,金属学报,14(1978) ,432． [6] Hideji Suzuki, Sci. Rep. Res, Inst. Tohoku Univ.,Ser. A, 7 (1955) , 194． [7] Raynor, D., Whiteman, J.A. and Honeycombe, R. W. K., J. Iron Steel Inst., 204 (1966) , 349． [8] Kuo Kehsin (郭可信), J. Iron Steel Inst., 174 (1953) , 223． [9] Speich, G.R. and Leslie, W.C., Met. Trans., 3 (1972) , 1043． [10] Honeycombe, R.W.K., J. Iron Steel Inst., Spec. Rep., 1959, № 86, p. 1． [11] Raynor, D., Whiteman, J.A. and Honeycombe, R.W.K., J. Iron Steel Inst., 204 (1966) , 1114． [12] Nutting, J., J. Iron Steel Inst., 207 (1969) , 872． [13] 李春志,物理学报,28(1979) ,314． [14] #12 [15] Baker, G.R. and Nutting, J., J. Iron Steel Inst., Spec. Rep., 1959, № 64, p. 1． [16] Dyson, D.J., Keown, S.R., Raynor, D. and whiteman, J.A., Acta Met., 14 (1966) , 867．U No related articles found! Viewed Full text Abstract Cited   Shared      Discussed