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| SA508-3钢内部闭合性裂纹缺陷高温焊合过程分析 |
| High Temperature Bonding Process of SA508-4 Steel Inner Closed Crack Defect |
| Received:February 15, 2019 Revised:March 10, 2019 |
| DOI：10.3969/j.issn.1674-6457.2019.02.008 |
| 中文关键词: SA508-3 闭合性裂纹 焊合 再结晶 |
| 英文关键词: SA508-3 closed crack defect bonding recrystallization |
| 基金项目:四川省科技厅应用基础研究重点项目（2019YJ0519）；四川省教育厅自然科学研究项目（18ZB0050） |
| Author Name | Affiliation | | YUE Tai-wen | Mechanical and Electrical Engineering Department, Chengdu Aeronautic Polytechnic, Chengdu 610021, China | | MEN Zheng-xing | Mechanical and Electrical Engineering Department, Chengdu Aeronautic Polytechnic, Chengdu 610021, China | | MA Ya-xin | Mechanical and Electrical Engineering Department, Chengdu Aeronautic Polytechnic, Chengdu 610021, China | | TANG Yue | Mechanical and Electrical Engineering Department, Chengdu Aeronautic Polytechnic, Chengdu 610021, China |
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| 中文摘要: |
| 目的 针对钢中存在闭合性内部裂纹的问题，研究闭合性裂纹缺陷的修复方法。方法 采用实验及数字模拟分析方法，研究了SA508-3钢闭合性裂纹缺陷在高温小塑性变形下的焊合过程。结果 SA508-3钢在奥氏体相区的高温小塑性变形焊合是以薄膜破裂-再结晶-扩散的方式进行，在变形量为5%的情况下，实验温度为1000 ℃以上时，试样基本焊合，实验温度低于950 ℃以下时，试样未焊合。结论 采用数字模拟表明，在不同温度下，焊缝区域等效应变不随温度变化而变化，而等效应力的变化与材料的峰值应力相关。 |
| 英文摘要: |
| The paper aims to solve inner closed crack defect in steel and study methods for repairing inner closed crack defects. The bonding process of SA508-4 steel inner closed crack defect at high temperature with small plastic deformation was researched through experimental and numerical simulation methods. Experimental results showed that the small plastic deformation of SA508-4 steel under high temperature occurred through film crack, recrystallization and spread. The closed crack of SA508-3 steel achieved bonding under temperature ≥1000 ℃, deformation ≥5%, but the lack of bonding was existed under temperature ≤950 ℃. Numerical simulation shows that the equivalent strain in bonding area does not change with temperature, whereas the change of equivalent strain is related to metal’s peak stress. |
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