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正火温度对含钛高铬耐热钢显微组织和性能的影响 被引量:1

Effect of normalizing temperature on microstructure and properties of high chromium heat-resistant steel with titanium
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摘要 采用光学显微镜、X射线衍射、扫描电镜和透射电镜研究了正火温度对不含钛和含钛(0.14wt%)高铬马氏体耐热钢显微组织和力学性能的影响。结果表明:在1000-1150℃范围内,随正火温度的升高,不含钛的钢晶粒明显长大,而含钛钢晶粒大小基本不变;经不同温度正火和750℃高温回火处理后,两种钢的洛氏硬度值均随正火温度的升高先增后减,在1100℃正火处理时达到峰值,含钛钢的洛氏硬度均略低于不含钛的钢。1100℃×1h正火处理+750℃×1h高温回火处理后,含钛钢在晶界上存在尺寸约为2μm的TiC颗粒,在马氏体板条界附近区域内分布有高密度纳米TiC析出相。蠕变过程中裂纹易于在大颗粒TiC的界面处形核导致含钛钢的高温蠕变性能降低。 Effects of normalizing temperature on microstructure and properties of the high Cr martensitic heat-resistant steels without Ti and with 0. 14wt% Ti were studied by the optical microscope, XRD, SEM and TEM. The results show that the austenite grain coarsens obviously with increasing normalizing temperature from 1000 ℃ to 1150℃ for the steel without Ti, but it doesn't grows for the steel with 0. 14wt% Ti. After normalizing and tempering heat treatment, hardness increases with increasing normalizing temperature below 1000 ℃ followed by a decreases above 1000 ℃ for the both steels, and the steel with 0. 14wt% Ti has a lower hardness than the steel without Ti. Both large TiC particles with a size of about 2 μm distributed in grain boundaries and dense nano-sized TiC particles in grain and martensitic lath boundaries were found in the steel with 0. 14wt% Ti after normalizing at 1100 ℃ for 1 h and tempering at 750 ℃ for 1 h. The creep crack is prone to nucleate at the interface between matrixes and the large TiC particles resulting in the decrease of the high temperature creep property.
出处 《金属热处理》 CAS CSCD 北大核心 2008年第10期34-36,共3页 Heat Treatment of Metals
基金 国家自然基金(50771059) 山东理工大学科研基金(2005KJM03)
关键词 耐热钢 蠕变 纳米析出相 碳化钛 heat-resistant steel creep nano-sized precipitate TiC
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参考文献4

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