不同pH的堿性環(huán)境中16Mn鋼及熱影響區(qū)應(yīng)力腐蝕行為
發(fā)布時(shí)間：2018-09-04 17:35
【摘要】：利用電化學(xué)技術(shù)和U形彎試樣浸泡實(shí)驗(yàn)研究了16Mn鋼及其模擬熱影響區(qū)(HAZ)在不同pH的堿性硫化物和Cl-介質(zhì)中的應(yīng)力腐蝕開裂(SCC)行為與機(jī)理。結(jié)果表明:16Mn鋼原始組織、粗晶組織(空冷組織)和硬化組織(淬火組織)在pH為11.8的堿性硫化物環(huán)境中均近似呈鈍化狀態(tài),維鈍電流密度依次降低;隨著pH的降低,原始組織和粗晶組織的陽(yáng)極過程逐漸由鈍化態(tài)轉(zhuǎn)變?yōu)榛罨瘧B(tài);HAZ中硬化組織、粗晶組織和原始組織在堿性硫化物環(huán)境下的SCC敏感性依次降低,其中硬化組織具有明顯的SCC特征;隨著pH的降低,SCC裂紋有從沿晶裂紋轉(zhuǎn)變?yōu)榇┚Ш脱鼐Щ旌狭鸭y的趨勢(shì),并且裂紋的寬度增加。
[Abstract]:The stress corrosion cracking (SCC) behavior and mechanism of 16Mn steel and its simulated heat affected zone (HAZ) in alkaline sulfide and Cl- medium of different pH were studied by electrochemical technique and immersion test of U-shaped bend specimen. The results show that the original structure, coarse grain structure (air-cooled structure) and hardened microstructure (quenched structure) of the steel are approximately passivated in alkaline sulfide environment with pH of 11.8.The density of the blunt current decreases in turn, and with the decrease of pH, the initial structure of the steel is approximately passivated. The anodic process of the original and coarse grained microstructure was gradually changed from passivated state to the sclerosing structure in the activated state. The SCC sensitivity of the coarse crystalline structure and the original structure in alkaline sulfide environment decreased in turn, and the hardened microstructure had obvious SCC characteristics. With the decrease of pH, the crack changed from intergranular crack to transgranular and intergranular mixed crack, and the width of crack increased.
【作者單位】： 北京科技大學(xué)腐蝕與防護(hù)中心;吉林油田公司;
【基金】：國(guó)家科技支撐計(jì)劃項(xiàng)目(2011BAK06B01-01)
【分類號(hào)】：TG142.1;TG172.9
[Abstract]:The stress corrosion cracking (SCC) behavior and mechanism of 16Mn steel and its simulated heat affected zone (HAZ) in alkaline sulfide and Cl- medium of different pH were studied by electrochemical technique and immersion test of U-shaped bend specimen. The results show that the original structure, coarse grain structure (air-cooled structure) and hardened microstructure (quenched structure) of the steel are approximately passivated in alkaline sulfide environment with pH of 11.8.The density of the blunt current decreases in turn, and with the decrease of pH, the initial structure of the steel is approximately passivated. The anodic process of the original and coarse grained microstructure was gradually changed from passivated state to the sclerosing structure in the activated state. The SCC sensitivity of the coarse crystalline structure and the original structure in alkaline sulfide environment decreased in turn, and the hardened microstructure had obvious SCC characteristics. With the decrease of pH, the crack changed from intergranular crack to transgranular and intergranular mixed crack, and the width of crack increased.
【作者單位】： 北京科技大學(xué)腐蝕與防護(hù)中心;吉林油田公司;
【基金】：國(guó)家科技支撐計(jì)劃項(xiàng)目(2011BAK06B01-01)
【分類號(hào)】：TG142.1;TG172.9
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