航空学报 > 1998, Vol. 19 Issue (1): 126-128

20Cr11MoVNbNB 钢高温蠕变过程中沉淀相的粗化动力学

憨勇1, 杨君刚2, 符长璞2   

  1. 1. 西安交通大学材料科学与工程学院, 西安, 710049;2. 西安理工大学材料科学与工程学院, 西安, 710048
  • 收稿日期:1997-04-22 修回日期:1997-09-02 出版日期:1998-02-25 发布日期:1998-02-25

COARSENING KINETICS OF PRECIPITATES IN 20Cr11MoVNbNB STEEL DURING CREEP

Han Yong1, Yang Jungang2, Fu Changpu2   

  1. 1. School of Materials Science and Engineering, Xian Jiaotong University, Xian, 710049;2. School of Materials Science and Engineering, Xian University of Science and Technology,Xian, 710048
  • Received:1997-04-22 Revised:1997-09-02 Online:1998-02-25 Published:1998-02-25

摘要:

对20Cr11MoVNbNB钢550℃、650℃蠕变过程中的沉淀相研究表明:M23C6和MC型碳化物是该钢的主要沉淀相;M23C6和MC的粗化均符合D-t1/4线性规律、受体扩散和位错扩散综合控制;M23C6的粗化速率比MC的大。

关键词: 20Cr11MoVNbNB耐热钢, 蠕变, 沉淀相

Abstract:

The precipitates in 20Cr11MoVNbNB heat resisting steel quenched at 1130℃ and tempered at 700℃ for 4h, and subsequently creeped at 550℃ for 5462h and 650℃ for 2968h were studied by means of XRD, TEM, etc . It is shown that M 23 C 6 and MC are main precipitates in 20Cr11MoVNbNB steel. The coarsening kinetics of M 23 C 6 and MC have the same 4th power law, synthetically controlled by both block diffusion and dislocation diffusion, and regardless of their original precipitating positions. The coarsening rate of M 23 C 6 is faster than that of MC.

Key words: 20Cr 11MoVNbNB heat r esist ing steel, cr eep, pr ecipitat es

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