30CrMnSiNi2A晶格参量的测量及回复规律研究

Variation of parameters and recovery in crystal lattice of 30CrMnSiNi2A

针对X射线衍射领域中晶面衍射峰重叠问题,提出一种新的重叠峰分离方法.采用RU-200V转靶衍射仪对30CrMnSiNi2A晶格参量及其回复规律进行研究,得出不同回火温度下晶格参量与碳含量的变化关系.研究结果发现:由于碳的过饱和度不同以及合金元素的影响,30CrMnSiNi2A与高碳马氏体晶格参量的变化规律虽基本符合,但其变化速率存在差异.在不同回火温度下晶格参量a基本与碳含量无关,随着回火温度升高,a值略有下降.晶格参量c则随碳含量的变化幅度较大,从淬火态到180℃回火态出现一个陡降过程,随着回火温度升高,其变化幅度又趋于平缓.

Aiming at the peaks overlapping in the field of X-ray diffraction, a new method for peaks separation was developed, and the parameters and recovery behaviors of crystal lattice of 30CrMnSiNi2A were investigated using RU-200V X-ray powder diffraetmeter, by which the relationship between lattice parameters and carbon content at different tempering temperatures was obtained. Results show that the variation of lattice parameters of 30CrMnSiNi2A is consistent with high-carbon martensite on the whole, however there are some differences in the rate of change. The lattice parameter a is independent of carbon content, and slightly decreases with the rise of tempering temperature, while the amplitude of change for the lattice parameter c and carbon content is large, and a steep drop is observed in the process of quenching to the tempering temperature at 180 ℃, while the amplitude becomes flat aferwards for a higher tempering temperature.