Volume 23 Preprint 82


Effect of arc remelting on Microstructure and pitting corrosion resistance of 441 ferritic stainless steel

Shuangchun Zhu and Biao Yan

Keywords: Ferritic stainless steel, pitting corrosion, arc remelting, precipitate

Abstract:
<p class="MsoNormal" style="color: rgb(0, 0, 0); font-size: medium;">In this paper, the microstructure of 441 ferritic stainless steel after self fusion welding is prepared by multi arc remelting. The pitting corrosion resistance of base metal and arc remelted metal is compared through pitting corrosion immersion test. The microstructure changes of 441 ferritic stainless steel after arc remelting and its influence on pitting corrosion resistance are studied through metallographic structure observation, precipitate analysis and corrosion pit surface observation and analysis.The results show that, compared with the base metal, the grains of arc remelted&nbsp;metal&nbsp;structure grow abnormally and form coarse ferrite columnar structure; there are large particles of carbonitride&nbsp;precipitates of&nbsp;Ti and Nb and small particles of Laves precipitates&nbsp;containing Nb&nbsp;in the base metal, and the precipitates in the arc remelted metal&nbsp;are smaller and more evenly distributed, most of which are composite precipitates&nbsp;of Nb and Ti.&nbsp;The corrosion rate of base metal is 23.4 g·(m<sup>2</sup>·h)<sup>-1</sup>. After arc remelting, the corrosion rate of metal is 20.88 g·(m<sup>2</sup>·h)<sup>-1</sup>, and the pitting corrosion resistance is improved.</p>

Because you are not logged-in to the journal, it is now our policy to display a 'text-only' version of the preprint. This version is obtained by extracting the text from the PDF or HTML file, and it is not guaranteed that the text will be a true image of the text of the paper. The text-only version is intended to act as a reference for search engines when they index the site, and it is not designed to be read by humans!

If you wish to view the human-readable version of the preprint, then please Register (if you have not already done so) and Login. Registration is completely free.

It has not been possible to produce a text version of this paper.