Transactions of Materials and Heat Treatment

Title：Analysis on high temperature and small deformation bonding process of

Authors： Men Zhengxing Li Qi Ma Yaxin Zhou Jie Yue Taiwen

Unit： Chengdu Aeronautic Polytechnic Erzhong (Deyang) Heavy Equipment Co. Ltd. Chongqing University

KeyWords： SA508-3 steel nozzle bonding inclusions impact energy

ClassificationCode：TG316.2

year,vol(issue):pagenumber：2018,43(11):156-159

Abstract：

In order to verify the feasibility of bonding for large nuclear power forgings of SA508-3 steel and the repair of internal closed cracks under high temperature and small deformation, firstly the influence of the bonding surface cleaning method on the impact energy after bonding was analyzed by the bonding test of cylinder sample. Then, the different small-scale nozzle bonding test schemes were designed, and the bonding effect of the nozzle structure was analyzed by the microstructure. The experimental and numerical simulation results show that the closed crack of SA508-3 steel achieves bonding in the form of repair recrystallization method under temperature ≥1000 ℃, deformation ≥5% and holding time ≥60 s, and the microstructure of the bonding interface is basically same as the substrate with the equivalent strain of 0.05 on the bonding surface. However, the inclusions and oxidation on the bonding surface directly affect the mechanical properties of material after bonding, which is the main reason for the large fluctuation of material impact energy. Thus, the various surface cleaning methods currently used cannot effectively eliminate the inclusions and oxidation on the bonding surface.

Funds：

国家自然科学基金资助项目(51275543)；四川省教育厅资助项目(17ZB0035、18ZA0032、18ZB0050)

门正兴（1980-），男，博士，高级工程师，副教授,E-mail：amen1980@163.com

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