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一、利用温度测量气门测取气门的温度场 利用专用的温度测量气门能够测得气门的温度场,它是利用淬火钢在高温下的退火作用而使硬度降低的原理。所以,首先应该知道其硬度降低与温度间的关系,并以此作为计算气门温度场的校正曲线。为了提高测量、计算的准确性,测量中应始终使用同样材料的温度测量气门,如能有温度测量气门用各种材料的校正曲线则更好。这样也就掌握了各种材料和退火温度的影响。使用X45Crsi93（1.4718）钢作为温度测量气门的材料是适合的。在500～800℃的范围内,这种材料的测量准确性很高。在800℃以上,退火温度——硬度曲线就变得很平,计算结果就不准确了。超过920℃时,由于超过了相变点Acl,它的硬度重又提高。
First, the use of temperature measurement valve to measure the valve temperature field Using a dedicated temperature measurement valve can measure the temperature field of the valve, which is the use of hardened steel at high temperatures annealing the hardness of the principle. So, first of all, you should know the relationship between hardness reduction and temperature, and use it as a calibration curve to calculate the valve temperature field. In order to improve the accuracy of measurement and calculation, the temperature measurement valve of the same material should always be used in the measurement, and the calibration curve of various materials for the temperature measurement valve is better. This also mastered the effects of various materials and annealing temperatures. It is suitable to use X45Crsi93 (1.4718) steel as the material for the temperature measuring valve. In the range of 500 ~ 800 ℃, this material has high measurement accuracy. Above 800 ℃, annealing temperature - hardness curve becomes very flat, the calculation result is not accurate. Above 920 ° C, its hardness increases again due to exceeding the transformation point Ac1.