Hegetschweiler Andreas, Borovinskaya Olga, Staudt Thorsten, Kraus Tobias
INM - Leibniz Institute for New Materials , Campus D2 2 , 66123 Saarbrücken , Germany.
TOFWERK , 3600 Thun , Switzerland.
Anal Chem. 2019 Jan 2;91(1):943-950. doi: 10.1021/acs.analchem.8b04012. Epub 2018 Dec 11.
We introduce a new method for the characterization of particles extracted from steels. Microalloyed steels were dissolved to extract niobium and titanium carbonitride particles, which are of critical importance for the mechanical properties of the steel. The size distribution and chemical composition of the particles were analyzed by single-particle inductively coupled plasma mass spectrometry and compared to results from electron microscopy. Mass spectrometry rapidly provided data on a large number of particles (>2000 in 1 min) and indicated two particle populations that differed in size and composition: smaller particles contained only niobium, whereas larger particles contained both niobium and titanium. Electron microscopy of a much smaller number of particles confirmed the results and indicated that the larger particles had complex, overgrown structures. The combination of single-particle mass spectrometry and electron microscopy enables a better understanding of the precipitation processes that form the particles during steel production at different stages of the thermomechanical-rolling process. A better understanding of the processes helps to improve the rolling process in order to exploit the alloying elements optimally.
我们介绍了一种表征从钢中提取的颗粒的新方法。将微合金钢溶解以提取铌和钛碳氮化物颗粒，这些颗粒对钢的机械性能至关重要。通过单颗粒电感耦合等离子体质谱法分析颗粒的尺寸分布和化学成分，并与电子显微镜的结果进行比较。质谱法能快速提供大量颗粒的数据（1分钟内>2000个），并表明存在两种尺寸和成分不同的颗粒群体：较小的颗粒仅含铌，而较大的颗粒同时含铌和钛。对数量少得多的颗粒进行电子显微镜观察证实了这些结果，并表明较大的颗粒具有复杂的、过度生长的结构。单颗粒质谱法和电子显微镜相结合，有助于更好地理解在热机械轧制过程的不同阶段钢生产过程中形成颗粒的析出过程。更好地理解这些过程有助于改进轧制工艺，从而最佳地利用合金元素。
