李萍,付千发,李喜孟,王来,郝静燕

• 1:大连理工大学材料科学与工程学院

摘要(Abstract)：

通过高温短时加热,模拟产生球化级别不同的珠光体。利用脉冲回波法测定超声波在球化样品中传播速度。依据弹性模量与声速和密度之间的相关性推算时效样品的弹性指标。结果表明:随时效时间的增加,弹性指标单调递减,杨氏模量E从213 GPa下降到199.6 GPa,剪切模量G从82.5 GPa下降到77.5 GPa,体弹模量K从159.1 GPa下降到147.1 GPa,泊松比σ变化较小,从0.291变化到0.286。分析认为:球化过程中,片状渗碳体分解以及球状碳化物在晶界的析出与聚集成网状严重削弱了晶界强度;时效时间延长到2300 h,材料组织局部发生石墨化,石墨是低弹性"软"介质,与铁素体基体之间的结合能力差,这严重降低材料的弹性性能指标。

关键词(KeyWords)： 超声无损评价;球化;声速;弹性性能

Abstract:

Keywords:

基金项目(Foundation):

作者(Author): 李萍,付千发,李喜孟,王来,郝静燕

DOI: 10.13289/j.issn.1009-6264.2010.05.024

参考文献(References)：

• [1]朱日彰.耐热钢和高温合金[M].北京:化工工业出版社,1996.
• [2]Vazdirvanidis A,Pantazopoulos G,Louvaris A.Overheat induced failure of a steel tube in an electric arc furnace cooling system[J].EngineeringFailure Analysis,2008,15(7):931-937.
• [3]孙智,王温银,高海燕,等.热轧12Cr1MoV钢在高温运行中组织和性能变化的研究[J].金属热处理,1998(2):12-15.SUN Zhi,WANG Wen-yin,GAO Hai-yan,et al.Study on variation of microstructures and properties of hot-rolling 12Cr1MoV steel in hightemperature running[J].Heat Treatment of Metals,1998(2):12-15.
• [4]杨瑞成,赵庆权,吕学飞,等.珠光体耐热钢在高温时效中的材料弱化[J].材料科学与工艺,2007,15(2):221-224.YANG Rui-cheng,ZHAO Qing-quan,LU Xue-fei,et al.Material weakening of pearlitic heat-resistant steel during high temperature aging[J].Material Science&Technology,2007,15(2):221-224.
• [5]杨瑞成,郑丽平,王晖,等.珠光体耐热钢高温时效后基体力学性能的变化[J].钢铁研究学报,2002,14(6):40-44.YANG Rui-cheng,ZHENG Li-ping,WANG Hui,et al.Change in mechanical property of matrix for pearlitic heat resistant steel after long-term agingat elevated temperature[J].Journal of Iron and Steel Research,2002,14(6):40-44.
• [6]杨王玥,李志文.θ法预测12Cr1MoV钢主蒸汽管道材料剩余寿命[J].金属学报,1999,35(7):721-725.YANG Wang-yue,LI Zhi-wen.The residual life evaluation for main steam pipe of 12Cr1MoV steel in power plant by theθ-projection concept[J].Acta Metallurgica Sinica,1999,35(7):721-725.
• [7]Badidi B A,Benchaala A,Alem K.Ultrasonic characterization of materials hardness[J].Ultrasonics,2000,38(1-8):224-227.
• [8]李萍,李喜孟,谭家隆,等.超声检测技术用于评价20钢高温组织转变[J].中国测试技术,2006,32(1):11-13.LI Ping,LI Xi-meng,TAN Jia-long,et al.Application of ultrasonic testing in evaluating 20G high temperature microstructure transformation[J].China Measurement Technology,2006,32(1):11-13.
• [9]徐志东,范子亮.金属材料的弹性模量随温度变化规律的唯象解释[J].西南交通大学学报,1993(2):87-92.XU Zhi-dong,FAN Zi-liang.A phenomenological explanation of the variation of elastic modulus with temperature for metallic materials[J].Journal ofSouthwest Jiaotong University,1993(2):87-92.
• [10]王汝菊,李立龙,汪卫华.金属玻璃弹性性能与显微结构的分析与检测[J].声学技术,2001,20(3):129-130.WANG Ru-ju,LI Li-long,WANG Wei-hua.The elastic property and microstructure of the metallic glass[J].Technical Acoustics,2001,20(3):129-130.
• [11]陈以方,张家骏.超声检测工件弹性模量的研究[J].无损检测,1997,19(9):241-244.CHEN Yi-fang,ZHANG Jia-jun.Research on ultrasonic testing for elastic moduli of workpieces[J].Nondestructive Testing,1997,19(9):241-244.
• [12]应崇福.超声学[M].北京:科学出版社,1993.
• [13]李喜孟.无损检测[M].北京:机械工业出版社,2001.
• [14]冯若.超声手册[M].南京:南京大学出版社,1999.
• [15]艾昶宏,何玉明,胡而已.超声法测量某合金材料弹性模量温度系数[J].华中科技大学学报:城市科学版,2006,23(2):68-70.AI Chang-hong,HE Yu-ming,HU Er-yi.Elastic module temperature coefficient measurement for a special alloy material by ultrasonic method[J].Jof Huazhong University of Science and Technology:Urban Science Edition,2006,23(2):68-70.
• [16]胡社军,张以增.球化20碳钢的损伤与弹性模量的变化[J].机械强度,1989,11(2):13-16.HU She-jun,ZHANG Yi-zeng.Investigation of damage and change of modulus of elastic in a low carbon steel subjected to tensile[J].MechanicalStrength,1989,11(2):13-16.
• [17]黄曙江.间接测量误差计算中的一个问题[J].大学物理实验,2006,19(2):68-69.HUANG Shu-jiang.A problem in error calculating in indirect measurement[J].Physical Experiment of College,2006,19(2):68-69.
• [18]王润.金属材料物理性能[M].北京:冶金工业出版社,1985.
• [19]盛国裕.超声波测厚仪检测轴承内部显微组织[J].无损探伤,1998(3):16-18.SHENG Guo-yu.Testing of bearing microstructure by ultrasonic thickness gauge[J].Non-destructive Tesing,1998(3):16-18.
• [20]戚正风.固态金属中的扩散与相变[M].北京:机械工业出版社,1998:12.
• [21]李萍,李喜孟,谭家隆,等.超声速法评价低碳钢的石墨化[J].大连理工大学学报,2004,44(6):802-804.LI Ping,LI Xi-meng,TAN Jia-long,et al.Ultrasonic velocity method evaluating graphitization in low-carbon steel[J].Journal of Dalian Universityof Technology,2004,44(6):802-804.

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