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利用慢应变速率试验,采用非标准的漏斗状试样,对国产690合金与321不锈钢异种金属焊接部位(包括690合金热影响区、焊缝、321不锈钢热影响区)在100 mg/L Cl~(-1)除O_2条件下和100 mg/L Cl~(-1)饱和O_2条件下的应力腐蚀行为进行研究。并通过慢应变速率应力-位移曲线和断口形貌对微观组织、氯离子、氧含量对于材料的应力腐蚀(SCC)的影响进行分析。结果表明:690合金热影响区在100 mg/L Cl~(-1)除O_2条件下不易发生SCC,在100 mg/L Cl~(-1)饱和O_2条件下表现出一定的SCC倾向;321不锈钢热影响区在2种条件下均表现出明显的SCC倾向;690合金热影响区的粗大晶粒不利于塑性变形的晶粒间相互协调,导致了热影响区SCC的倾向增大。
Using slow strain rate test and non - standard funnel - shaped test specimens, the welded joints of 690 alloy and 321 stainless steel dissimilar metal (including HAZ of 690 alloy, weld and 321 stainless steel HAZ) were treated with 100 mg / (-1) under the conditions of O 2 and 100 mg / L Cl -1 saturated O 2. The effects of microstructure, chloride ion and oxygen content on SCC were analyzed by slow strain rate stress-displacement curve and fracture morphology. The results showed that SCC was not easily formed in heat affected zone of 690 alloy except 100 mg / L Cl ~ (-1), and showed a tendency of SCC under 100 mg / L Cl ~ (-1) saturated O2. The heat-affected zone of stainless steel shows obvious tendency of SCC under both conditions. The coarse grains in the heat-affected zone of 690 alloy are not conducive to the mutual coordination of the plastic deformation grains, which leads to the increase of the SCC tendency in the heat affected zone.