00Cr18Ni10N奥氏体不锈钢焊接接头应力腐蚀特性

采用恒载荷应力腐蚀实验方法和表面显微分析方法研究了3.5% NaCl水溶液中00Cr18Ni10N奥氏体不锈钢母材及焊接接头的应力腐蚀开裂行为.通过应力腐蚀120 h后剩余强度的损失量分析来比较00Cr18Ni10N母材及其焊接接头的应力腐蚀性能，并利用金相显微镜和扫描电镜研究了00Cr18Ni10N钢焊缝区、热影响区与母材的显微组织差别和应力腐蚀开裂断口形貌.结果表明，焊接接头的应力腐蚀断裂位置均位于焊缝区，在较高应力水平90%σ_0.2下00Cr18Ni10N母材的强度损失较焊接接头低13.02%，母材的抗应力腐蚀性能优于焊接接头.断口形貌分析表明，00Cr18Ni10N母材和焊接接头在应力和腐蚀介质的共同作用下发生断裂，断口显现出沿晶断裂和韧窝断裂的形貌特征.

Stress corrosion properties of 00Cr18Ni10N austenitic stainless steel welded joints

The behaviors of stress corrosion cracking of an austenitic stainless 00Cr18Ni10N parent material and its welded joint in 3.5% NaCl solution were investigated by using the constant load stress corrosion cracking and microscopic analysis methods. The residual strength was measured after 120 h for stress corrosion test to compare the stress corrosion resistance of 00Cr18Ni10N parent material and its welded joint through the loss analysis of strength. The microstructures of the weld zone, heat affected zone and base metal were analyzed by metallographic technique, and fracture morphology of stress corrosion cracking was investigated using scanning electron microscopy. The results show stress corrosion cracking of welded joints is located in the weld zone. A higher stress level 90% σ_0.2, the strength lose of 00Cr18Ni10N parent material is 13.02% lower than that of the welded joints, which show that the stress corrosion resistance of 00Cr18Ni10N parent material is superior to the weld material. The fracture morphology analysis shows that the fracture of 00Cr18Ni10N parent material and its welded joint has the characteristic of intergranular fracture and dimple fracture under the joint action of stress and corrosive solution.