• CN：11-2187/TH
• ISSN：0577-6686

›› 1980, Vol. 16 ›› Issue (1): 78-90.

• 论文 •

### 压力容器用钢再热裂纹形成机制及其防止措施的研究

1. 北京钢铁研究院;合肥通用机械研究所
• 发布日期:1980-01-01

### Research on Foumation-mechanism of Reheat Cracking with Steels for Pressure Vessel and Provisions of Prevention

Wang Yingshu;Liang Dongtu;Qu Meiling

1. 北京钢铁研究院 合肥通用机械研究所
• Published:1980-01-01

Abstract: The susceptibility to reheat cracking due to the heat-affected zone has been determined by using of the Y_type groove S. R. crack resisting test and other methods; and thin foil specimens taken from this heat-affected zone have been analysed by using Scanning Transmission Electron Microscope with attached EDAX. This combined analysis include morphological observation of- microstructure and determination of structure and orientation relationship. According to the precipitation hardening and creep deformation theory, the cause of reheat cracking has been discussed. It has been suggested that reheat cracking will be able to be controled and prevented through. Postweld isothermal treatment which has brought about the fragmentation of mosaic-block in the grains and a change in carbides precipitation and their distribution. After different experiments of postweld isothermal treatment and being proved by other related teels, this way of prevention has been proved as effective.