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钢线中成分-纳米结构导向的性能预测

Composition-Nanostructure Steered Performance Predictions in Steel Wires.

作者信息

Tian Kun V, Passaretti Francesca, Nespoli Adelaide, Placidi Ernesto, Condò Roberta, Andreani Carla, Licoccia Silvia, Chass Gregory A, Senesi Roberto, Cozza Paola

机构信息

Department of Chemical Science and Technologies, Università degli Studi di Roma Tor Vergata, 00133 Roma, Italy.

Centro NAST, Università degli Studi di Roma Tor Vergata, 00133 Roma, Italy.

出版信息

Nanomaterials (Basel). 2019 Aug 3;9(8):1119. doi: 10.3390/nano9081119.

DOI:10.3390/nano9081119
PMID:31382607
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC6723625/
Abstract

Neutron scattering in combination with scanning electron and atomic force microscopy were employed to quantitatively resolve elemental composition, nano- through meso- to metallurgical structures and surface characteristics of two commercial stainless steel orthodontic archwires-G&H and Azdent. The obtained bulk composition confirmed that both samples are made of metastable austenitic stainless steel type AISI 304. The neutron technique's higher detection sensitivity to alloying elements facilitated the quantitative determination of the composition factor (CF), and the pitting resistance equivalent number (PREN) for predicting austenite stability and pitting-corrosion resistance, respectively. Simultaneous neutron diffraction analyses revealed that both samples contained additional martensite phase due to strain-induced martensite transformation. The unexpectedly high martensite content (46.20 vol%) in G&H was caused by combination of lower austenite stability (CF = 17.37, = .03), excessive cold working and inadequate thermal treatment during material processing. Together, those results assist in revealing alloying recipes and processing history, and relating these with corrosion resistance and mechanical properties. The present methodology has allowed access to unprecedented length-scale (μm to sub-nm) resolution, accessing nano- through meso-scopic properties. It is envisaged that such an approach can be extended to the study and design of other metallic (bio)materials used in medical sciences, dentistry and beyond.

摘要

结合扫描电子显微镜和原子力显微镜，利用中子散射技术定量解析了两种商用不锈钢正畸弓丝（G&H和Azdent）的元素组成、从纳米到中观再到金相的结构以及表面特性。所获得的整体成分证实，两个样品均由亚稳奥氏体不锈钢AISI 304制成。中子技术对合金元素具有更高的检测灵敏度，有助于分别定量测定用于预测奥氏体稳定性和耐点蚀性的成分因子（CF）和耐点蚀当量数（PREN）。同时进行的中子衍射分析表明，由于应变诱导马氏体转变，两个样品均含有额外的马氏体相。G&H中意外高的马氏体含量（46.20体积%）是由较低的奥氏体稳定性（CF = 17.37， = 0.03）、过度冷加工以及材料加工过程中热处理不足共同造成的。这些结果共同有助于揭示合金配方和加工历史，并将其与耐腐蚀性和机械性能联系起来。本方法能够实现前所未有的长度尺度（从微米到亚纳米）分辨率，获取从纳米到中观的特性。预计这种方法可以扩展到医学、牙科及其他领域中使用的其他金属（生物）材料的研究和设计。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/b313/6723625/859d5fe860ea/nanomaterials-09-01119-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/b313/6723625/4078a734c749/nanomaterials-09-01119-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/b313/6723625/86d6417ab75d/nanomaterials-09-01119-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/b313/6723625/d38356411847/nanomaterials-09-01119-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/b313/6723625/d0034911f97d/nanomaterials-09-01119-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/b313/6723625/75ffddc26ba3/nanomaterials-09-01119-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/b313/6723625/859d5fe860ea/nanomaterials-09-01119-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/b313/6723625/4078a734c749/nanomaterials-09-01119-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/b313/6723625/86d6417ab75d/nanomaterials-09-01119-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/b313/6723625/d38356411847/nanomaterials-09-01119-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/b313/6723625/d0034911f97d/nanomaterials-09-01119-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/b313/6723625/75ffddc26ba3/nanomaterials-09-01119-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/b313/6723625/859d5fe860ea/nanomaterials-09-01119-g006.jpg

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