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.
-
Keywords:
- Ultrasonic testing /
- High-Chromium cast iron /
- Microstructure /
- Velocity
-
-
[1] Psaras peter A, Langford H Dale.发展中的材料研究[M].杨柯，译.沈阳：辽宁科学技术出版社,1994. [2] Ambardar R, Muthu M T, Patbak S D, et al. Effect of porosity pore diameter and grain size on ultrasonic attenuation in aluminum alloy castings[J]. Insight,1995,37(7):536-543. [3] Degtyar A D. New method for determination of applied and residual stresses in anisotropy materials form ultrasonic velocity measurement[J]. Materials Evaluation,1997,55(10):1162-1168. [4] Badidi B A, Lebaili S. Grain size influence on ultrasonic velocities and attenuation[J]. NDT&E International,2003,36(1):1-5. [5] 上海机械制造工艺研究所编.金相分析技术[M].上海：上海科学技术文献出版社,1987. [6] 钟继贵.误差分析与数据处理[M].北京：水利电力出版社,1993:68.
计量
- 文章访问数: 0
- HTML全文浏览量: 0
- PDF下载量: 0
下载:
