Simulation of droplet topography on superhydrophobic surface

We established a novel droplet model (with-gravity model) to show the gravity effect of the droplet in the contact angle experiment.By using with-gravity model, we obtained a three-dimensional topography of the droplet including the height of the droplet, the shape of the baseline and the circumference of the baseline.Comparing the with-gravity model with the ideal spherical model, our model considered the measurement error caused by gravity effect in the contact angle experiment which is a key point to influence the three-dimension topography of the droplet.From the calculation of our model, we found that there were two important points to enhance the measurement error: the size of the droplet and the contact angle.With the droplet and the contact angle became larger, measurement error was obviously increased.

冷轧硬化对超级双相不锈钢S32750析出相的影响

为了优化不同厚度冷轧板加热工艺,避免有害相析出,研究了冷硬化对S32750板材析出相的影响。超级双相不锈钢S32750钢板经不同冷轧加工变形后,在850℃下进行热处理。利用SEM、EDS、XRD及TEM研究了不同冷轧总压下率对析出相的影响规律。结果表明,随着总压下率的增大,相同退火时间内,析出相增多,当总压下率大于50%时铁素体相几乎全部被析出相覆盖。析出相以σ相为主,伴随着很少量的Cr2N、χ相和γ2。σ相和χ相析出在α/γ相界和铁素体相内,Cr2N析出在α/γ相界处,γ2伴随着σ相析出在铁素体内。随着冷轧总压下率增加,晶体内的位错密度增大,析出数量增加。