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首页> 外文期刊>Metals >Stress Corrosion Cracking Behaviour of Dissimilar Welding of AISI 310S Austenitic Stainless Steel to 2304 Duplex Stainless Steel
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Stress Corrosion Cracking Behaviour of Dissimilar Welding of AISI 310S Austenitic Stainless Steel to 2304 Duplex Stainless Steel

机译：AISI 310S奥氏体不锈钢与2304双相不锈钢的异种焊接应力腐蚀开裂行为

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The influence of the weld metal chemistry on the stress corrosion cracking (SCC) susceptibility of dissimilar weldments between 310S austenitic stainless steel and 2304 duplex steels was investigated by constant load tests and microstructural examination. Two filler metals (E309L and E2209) were used to produce fusion zones of different chemical compositions. The SCC results showed that the heat affected zone (HAZ) on the 2304 base metal side of the weldments was the most susceptible region to SCC for both filler metals tested. The SCC results also showed that the weldments with 2209 duplex steel filler metal presented the best SCC resistance when compared to the weldments with E309L filler metal. The lower SCC resistance of the dissimilar joint with 309L austenitic steel filler metal may be attributed to (1) the presence of brittle chi/sigma phase in the HAZ on the 2304 base metal, which produced SC cracks in this region and (2) the presence of a semi-continuous delta-ferrite network in the fusion zone which favored the nucleation and propagation of SC cracks from the fusion zone to HAZ of the 2304 stainless steel. Thus, the SC cracks from the fusion zone associated with the SC cracks of 2304 HAZ decreased considerably the time-of-fracture on this region, where the fracture occurred. Although the dissimilar weldment with E2209 filler metal also presented SC cracks in the HAZ on the 2304 side, it did not present the delta ferrite network in the fusion zone due to its chemical composition. Fractography analyses showed that the mixed fracture mode was predominant for both filler metals used.
机译：通过恒定载荷试验和显微组织检查，研究了焊接金属化学性质对310S奥氏体不锈钢和2304双相钢之间不同焊件的应力腐蚀开裂（SCC）敏感性的影响。两种填充金属（E309L和E2209）用于产生不同化学成分的熔合区。 SCC结果表明，对于两种被测试的填充金属，焊件的2304贱金属侧的热影响区（HAZ）是SCC最敏感的区域。 SCC结果还显示，与使用E309L填充金属的焊件相比，使用2209双相钢填充金属的焊件具有最佳的抗SCC性。具有309L奥氏体钢填充金属的异种接头的较低SCC电阻可能归因于（1）2304母材上的热影响区存在脆性chi / sigma相，这在该区域产生了SC裂纹，（2）在熔合区中存在半连续的δ铁素体网络，这有利于SC裂纹从2304不锈钢的熔合区到HAZ的形核和扩展。因此，与2304 HAZ的SC裂纹相关的来自融合区的SC裂纹大大减少了发生断裂的该区域的断裂时间。尽管与E2209填充金属的异种焊缝在2304侧的热影响区中也显示出SC裂纹，但由于其化学成分，在融合区中未显示出δ铁素体网络。断口扫描分析表明，两种填充金属均以混合断裂模式为主。

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