锻压技术

SA508-3钢管嘴结构高温小变形焊合成形工艺分析

英文标题：Analysis on high temperature and small deformation bonding process of

作者：门正兴李其马亚鑫周杰岳太文

关键词：SA508-3钢管嘴焊合夹杂物冲击功

分类号：TG316.2

出版年,卷(期):页码：2018,43(11):156-159

摘要：

为验证SA508-3钢大型核电锻件焊合成形以及内部闭合性裂纹高温小变形修复的可行性，首先采用圆柱试样进行焊合试验，分析焊合表面清洗方式对材料焊合后冲击功的影响；随后设计不同小比例管嘴焊合试验方案，通过微观组织对管嘴结构焊合成形效果进行分析。试验及数值模拟结果表明：SA508-3钢在温度≥1000 ℃、变形量≥5%及保压时间≥60 s的情况下，闭合裂纹均能实现以修复再结晶方式为主的焊合，且焊合界面微观组织与基体基本一致，焊合面等效应变在0.05左右；焊合面夹杂物及氧化会直接影响焊合后材料的力学性能，其是造成材料冲击功大幅波动的主要原因，而目前使用的各种表面清洗方式均无法有效消除焊合面夹杂物及氧化现象。

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.

基金项目：

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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