Measuring Relationship Between Ultrasonic Velocity and Organizational Structure of High-Chromium Cast Iron
摘 要
文章通过不同热处理手段获得高铬铸铁的不同组织,利用超声声速法、频谱分析和能谱分析对试样的组织进行超声评价研究,建立高铬铸铁组织与超声信号的关系。试验结果表明:相同淬火温度下,冷却速度不同时,空冷时试样中的马氏体最多,因此其声速也最小,炉冷时马氏体量最少,声速最大;不同的淬火温度下,随着淬火温度的不断升高,马氏体的量先增多后减少,因此声速也是先减小后增大;回火后试样中的声速比未回火的声速小,弹性模量的变化是造成声速变化的主要原因。
Abstract
The organizational structures of high-chromium cast iron were changed by heat treatment, ultrasonic evaluation of the organizational structures were researched by three ways of ultrasonic velocity, spectrum analysis, energy spectrum analysis. The ultrasonic evaluation model of the organizational structure in high-chromium cast iron was established. The experiment results indicated that at the same quenching but different cooling rate, the martensite in the test parts under air cooling was maximum, so the speed of sound was also the lowest. However, under furnace cooling, it showed that the speed of sound was also fastest since the martensite was smallest. If increasing solution temperature, the amount of martensite was increased at first and then decreased, corresponding the ultrasonic velocity was reducing first and then increasing. The velocity of sound wave of annealed samples was smaller than the test parts without tempering, the consequence was caused by the changes in elastic modulus.
中图分类号 TG115.28
所属栏目 2011年远东无损检测论坛论文精选
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收稿日期 2011/5/30
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备注邬亚华(1966-),女,主要从事基础实验教学和科研工作。
引用该论文: WU Ya-Hua,TANG Jia,WANG Fu-Xi,WU Guan-Hua,ZHU Kai. Measuring Relationship Between Ultrasonic Velocity and Organizational Structure of High-Chromium Cast Iron[J]. Nondestructive Testing, 2011, 33(12): 62~65
邬亚华,唐佳,王伏喜,邬冠华,朱凯. 高铬铸铁组织与超声声速关系的测定[J]. 无损检测, 2011, 33(12): 62~65
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