Thermodynamics Analysis on the Precipitation of Titanium Nitride in a Welding Wire Steel
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摘要: TiN是焊丝用钢ER50-G中存在的主要非金属夹杂物之一,对材料的使用性能有着显著影响。使用热场发射扫描电镜等对Ti含量约0.16%的ER50-G钢种的生产过程钢样进行了检测,在盘条成分基础上利用热力学计算得到其TiN粒子临界析出温度约为1 549.6℃,在该钢种的液相线以上。分析发现ER50-G在固、液两相状态下均有TiN粒子析出,但以液态下析出的较大尺寸的TiN粒子为主;结合对TiN粒子尺寸的测量结果和物理化学相分析结果,认为在ER50-G生产中,钢液中TiN粒子的析出量高于理论值,而固相下的析出量则低于理论值,从而推导得出TiN粒子的实际析出曲线。Abstract: As a kind of main non-metallic inclusions of ER50-G for welding wire,TiN has an obvious influence on the property of ER50-G.The sample with a Ti content of 0.16% obtained from the production process of ER50-G is examined by FE-SEM.Based on the chemical composition of the wire rod,the critical temperature for precipitation of TiN is calculated to be 1 822.6 K,which is above the liquidus of ER50-G.TiN precipitates in both liquid and solid phases,but mainly in liquid phase.It can be concluded that in the production of ER50-G,the precipitation amount of TiN particle in liquid steel is higher than theoretical value while lower in solid phase.Finally a practical curve of TiN precipitation is obtained.
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