摘要:
采用电解相分析试验方法,开展高强度管线钢铌钛碳氮化物回溶研究,同时采用简化处理方法进行相关回溶与析出的热力学计算,研究高Nb管线钢中高含量Nb元素和Ti元素回溶规律。结果表明:高Nb管线钢在1 180~1 280℃区间加热,铌、钛实际回溶量都不同程度地低于理论回溶量;温度低于1 250℃时,随加热时间的延长和温度的升高铌回溶效果明显;1 250℃加热2.5 h左右,即可使铌元素回溶90%以上,达到近完全回溶效果,Ti实际回溶较少,仅11%,钛元素形成的钛碳氮化物,具有良好的稳定性。
关键词:
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高强管线钢 /
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电解相 /
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Nb /
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Ti /
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固溶 /
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回溶 /
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析出强化
Abstract:
In this study,the redissolution and precipitation behaviors of niobium titanium carbonitride（Nb,Ti）（C,N） were researched by electrolytic phase analysis method and calculated by the simplified thermodynamic calculation method,and the dissolution law of Nb and Ti elements in high Nb pipeline steel was studied.The results showed that when the reheating temperature ranged at 1 180～1 280 ℃,the actual redissolution amount of Nb and Ti were lower than those of calculated values.When the reheating temperature was lower than 1 250 ℃,increasing temperature and heating time resulted into the significant solution amount of Nb in steel.When reheated at 1 250 ℃ for about 2.5 h,nearly 90% of niobium comes into solution and 11% of titanium into solution,since the titanium carbonitrides formed by have good stability.
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