• CN:11-2187/TH
  • ISSN:0577-6686

›› 1992, Vol. 28 ›› Issue (3): 65-70,1.

• 论文 • 上一篇    下一篇

扫码分享

20Cr11MoVNbNB钢中碳化物粗化动力学

张金旺;符长璞;潘景达;杜文峰   

  1. 陕西机械学院;北京重型电机厂
  • 发布日期:1992-05-01

COARSENING KINETICS OF CARBIDES IN 20Cr11MoVNbNB RESIST HEAT STEEL

Zhang Jinwang;Fu changpu;Pan Jingda;Du Wenfeng   

  1. Shangxi Mechanical Engineering Institute Beijing Heavy-duty Electrical Machinery Plant
  • Published:1992-05-01

摘要: 对淬火700℃回火及随后550~650℃时效0~5000h的20Cr11MoVNbNB钢中沉淀相的研究证明:M23C6和MC型碳化物是该钢的主要沉淀相,前者多沿原板条马氏体边界奥氏体晶界沉淀,后者多沉淀在基体位错处;M23C6和MC均具有体扩散控制的三次方粗化动力学规律,而与其原来析出的部位无明显关系;M23C的粗化速率比MC的大,二者粗化速率均受组成该相的迁移缓慢的合金元素的扩散所控制。上述结果对于用沉淀相来控制或预测耐热钢的性能或使用寿命有重要意义。

关键词: 沉淀, 合金钢, 时效

Abstract: The precipitates in 20Cr11MoVNbNB steel of quenched and tempered at 700℃, and subsequently aged at 55o~650℃ for 5000h were studied by the means of electrolytic extraction, x-ray diffraction, election microscope etc. It is established that M28C6 and MC are mainly precipitates in 20Cr11MoVNbNB Steel. The coarsening kinetics of M22C6 and MC have same cubic law controlled by block diffusion, and regardless of their original precipitating positions. The coarsening rate of M23C6 is faster than that of MC, and the coarsening rates of the two carbides are controlled by slow diffusion alloy element atoms which constitute the phases.

Key words: 沉淀, 合金钢, 时效