Transactions of Materials and Heat Treatment

Title：Bonding experiment of internal crack at high temperature for nuclear pressure vessels steel SA508-3

Authors： Men Zhengxing Ma Yaxin Zhou Jie Yue Taiwen Liu Ruilin Tang Yue

Unit： Chengdu Aeronautic Polytechnic Chongqing University

KeyWords： heavy forging SA508-3 steel crack bonding impurity

ClassificationCode：TG316.2

year,vol(issue):pagenumber：2017,42(6):159-163

Abstract：

Crack defects seriously affect the qualification rate and service life of heavy forgings. In order to ensure the quality of heavy forgings and improve the safety of nuclear pressure vessels, an experimental study on bonding process of nuclear pressure vessels steel SA508-3 was performed by preexisting crack with the parameters of heating temperature, displacement under pressure and pressure holding time. Then, the bonding effect of crack was evaluated by metallographic microscope, scanning electron microscope, energy spectrum analysis and mechanical property tests. The results show that all of internal cracks of material SA508-3 can be bonded in the case of small deformation, high temperature and short pressure holding time. Furthermore, its suitable condition is with small deformation of 10%, high temperature of 1100 ℃ and short pressure holding time of 15 s respectively. However, the strength of samples after bonding is similar to that of original material, but the plasticity has a heavy fluctuation coming from the impurities in the process of sample bonding which is confirmed by scanning electron microscope and energy spectrum analysis.

Funds：

国家自然科学基金资助项目(51275543)；四川省教育厅科研资助项目（172B0035）

门正兴（1980-），男，博士，高级工程师

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