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首页> 外文期刊>Welding International >Numerical analysis of residual stress distribution generated by welding after surface machining based on hardness variation in surface machined layer due to welding thermal cycle
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Numerical analysis of residual stress distribution generated by welding after surface machining based on hardness variation in surface machined layer due to welding thermal cycle

机译：基于焊接热循环引起的基于硬度变化的表面加工后焊接焊接焊接应力分布的数值分析

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摘要

Recently, stress corrosion cracking (SCC) has been observed near the welded zone of the primary loop recirculation pipes made of low-carbon austenitic stainless steel type 316L in boiling water reactors. SCC is initiated by superposition effect of three factors. They are material, environmental and mechanical factors. For non-sensitized material such as type 316L, residual stress as a mechanical factor of SCC is comparatively important. In the joining processes of pipes, butt welding is conducted after surface machining. Surface machining is performed in order to match the inside diameter and smooth surface finish of pipes. Residual stress is generated by both processes. Moreover, residual stress distribution generated by surface machining is varied by subsequent welding processes, and it has the maximum residual stress around 900 MPa near the weld metal. The variation of metallographic structure, such as recovery and recrystallization, in the surface machined layer due to the welding thermal cycle is an important factor for this residual stress distribution. In this study, thermal ageing tests were performed in order to evaluate hardness variation due to the thermal cycle in the surface machined layer. Results of thermal ageing tests were applied to the finite-element method as the additivity rule of the hardness variation. Varied hardness was converted into equivalent plastic strain. Then, thermo-elastic-plastic analysis was performed under residual stress fields generated by surface machining. As a result, analytical results of surface residual stress distribution generated by bead-on-plate welding after surface machining show good agreement with measured results by the X-ray diffraction method. The maximum residual stress near the weld metal is generated by the same mechanism as in the both-ends-fixed bar model in the surface machined layer that has high yield stress.
机译：最近，在沸水反应器中由低碳奥氏体不锈钢型316L制成的初级环再循环管的焊接区域附近观察到应力腐蚀裂纹（SCC）。 SCC由三个因素的叠加效应引发。它们是物质，环境和机械因素。对于非敏化材料，例如316L型型，作为SCC的机械因子的残余应力相对重要。在管道的连接过程中，在表面加工后进行对焊接。进行表面加工以匹配管道的内径和光滑的表面光洁度。两种过程产生残余应力。此外，由表面加工产生的残余应力分布通过随后的焊接过程而变化，并且在焊接金属附近具有约900MPa的最大残余应力。由于焊接热循环导致的表面加工层中的金相结构的变化，例如回收和重结晶，在表面加工层中是这种残余应力分布的重要因素。在该研究中，进行热老化试验以评估由于表面加工层中的热循环引起的硬度变化。作为硬度变化的添加量规律，将热老化试验结果应用于有限元法。变化的硬度转化为等同的塑性菌株。然后，在由表面加工产生的残余应力场下进行热弹性分析。结果，在表面加工后由珠子板焊接产生的表面残余应力分布的分析结果显示出与X射线衍射法测量结果的良好一致性。焊接金属附近的最大残余应力由与具有高屈服应力的表面加工层中的两端固定条模型相同的机制产生。

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