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Investigation on effect of thermal aging embrittlement on residual stresses of austenitic stainless steel repair welds in nuclear components subject to seismic loads
Journal of Mechanical Science and Technology ( IF 1.6 ) Pub Date : 2020-07-08 , DOI: 10.1007/s12206-020-0615-4
Jong-Sung Kim , Maan-Won Kim , Jun-Seok Yang

This paper presents investigation results on effect of thermal aging embrittlement on residual stresses of austenitic stainless steel repair welds in nuclear components subject to seismic loads. First, the welds on austenitic stainless steel 316L plates were manufactured consisting of the austenitic stainless steel weld metal with the δ—ferrite content sensitive to the thermal aging embrittlement. One of the welds was embrittled via conducting thermal aging acceleration test. Second, validity of finite element weld residual stress analysis was verified by performing finite element residual stress analysis and holedrilling method for the unrepaired welds. Third, effect of the thermal aging embrittlement on the residual stresses of the repair welds was evaluated by comparing the residual stresses according to whether the original welds were thermally embrittled. Last, effect of seismic loads was reviewed for the case where the repair welding was performed on the original welds being thermally embrittled. As a result, it is found that the effect of the thermal aging embrittlement on the residual stresses of the unrepaired welds is insignificant whereas tensile residual stresses of the repair welds increase in proportion to the increase in yield strength at room temperature due to the thermal aging embrittlement. In addition, the residual stresses are significantly mitigated after the seismic loads.



中文翻译:

热老化脆化对承受地震载荷的核部件中奥氏体不锈钢修复焊缝残余应力的影响

本文介绍了热时效脆化对承受地震载荷的核部件中奥氏体不锈钢修补焊缝残余应力影响的调查结果。首先,制造奥氏体不锈钢316L板上的焊缝,该焊缝由奥氏体不锈钢焊缝金属组成,其δ-铁素体含量对热时效脆化敏感。其中一项焊缝通过进行热老化加速测试而变脆。其次,通过对未修复焊缝进行有限元残余应力分析和钻孔方法,验证了有限元焊接残余应力分析的有效性。第三,通过根据原始焊缝是否热脆来比较残余应力,评估了热时效脆化对修复焊缝残余应力的影响。最后,针对在热脆化的原始焊缝上进行补焊的情况,回顾了地震载荷的影响。结果发现,热时效脆化对未修复焊缝的残余应力的影响是微不足道的,而修复焊缝的拉伸残余应力与在室温下由于热时效引起的屈服强度的增加成比例地增加。脆化。此外,在地震荷载作用下,残余应力得到显着缓解。对于在热脆化的原始焊缝上进行修复焊接的情况,回顾了地震载荷的影响。结果发现,热时效脆化对未修复焊缝的残余应力的影响是微不足道的,而修复焊缝的拉伸残余应力与在室温下由于热时效引起的屈服强度的增加成比例地增加。脆化。此外,在地震荷载作用下,残余应力得到显着缓解。对于在热脆化的原始焊缝上进行修复焊接的情况,回顾了地震载荷的影响。结果发现,热时效脆化对未修复焊缝的残余应力的影响是微不足道的,而修复焊缝的拉伸残余应力与在室温下由于热时效引起的屈服强度的增加成比例地增加。脆化。此外,在地震荷载作用下,残余应力得到显着缓解。已经发现,热时效脆化对未修复焊缝的残余应力的影响是微不足道的,而由于室温下的热时效脆化,修复焊缝的拉伸残余应力与室温屈服强度的增加成比例地增加。此外,在地震荷载作用下,残余应力得到显着缓解。已经发现,热时效脆化对未修复焊缝的残余应力的影响是微不足道的,而由于室温下的热时效脆化,修复焊缝的拉伸残余应力与室温屈服强度的增加成比例地增加。此外,在地震荷载作用下,残余应力得到显着缓解。

更新日期:2020-07-08
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