论文部分内容阅读
本文用慢应变速率实验（ＳＳＲＴ）方法研究了奥氏体３０４不锈钢焊接接头在室温ＨＣｌ＋ＮａＣｌ溶液中应力腐蚀开裂（ＳＣＣ）敏感性Ｈ＋浓度和Ｃｌ－浓度是影响该体系发生ＳＣＣ的两个重要因素，Ｈ＋浓度的改变可使材料的腐蚀形态发生变化，对ＳＣＣ敏感的酸度范围为：５．０ｘ１０－４～３０ＭＨ＋，并给出体系“３０４不锈钢焊缝／ＨＣｌ＋ＮａＣｌ”的应力腐蚀状态图（［Ｃｌ－］－［Ｈ＋］－ＳＣＣ图）焊缝区是焊接接头的ＳＣＣ敏感区，应力腐蚀裂纹是沿着被选择性溶解的奥氏体枝晶间的δ－铁素体扩展的，断口具有奥氏体枝晶骨架的形貌．该体系发生的是活化态下的应力腐蚀．
In this paper, we studied the sensitivity of stress corrosion cracking (SCC) to austenitic 304 stainless steel welded joint at room temperature in HCl + NaCl solution by using a slow strain rate test (SSRT) method. H + concentration and Cl- concentration are the two important factors affecting SCC. The change of H + concentration can change the corrosion morphology of the material. The sensitivity range of SCC is 5.0x10-4 ~ 30MH +, and the stress corrosion state of “304 stainless steel weld / HCl + NaCl” ] - [H +] - SCC) The weld zone is the SCC sensitive zone of the welded joint. The stress corrosion cracking propagates along the δ-ferrite between the selectively dissolved austenite dendrites. The fracture has the austenite Body dendrite skeleton morphology. The system is under stress corrosion in the activated state.