Influence of atmosphere during vacuum heat treatment of stainless steels AISI 304 and 446

Influence of atmosphere during vacuum heat treatment of stainless steels AISI 304 and 446
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AISI 304 和 446 不锈钢真空热处理过程中气氛的影响

DOI:
10.1016/j.jmatprotec.2018.08.038
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发表时间:
2019
影响因子:
6.3
通讯作者:
Kai Möhwald
Kai Möhwald
中科院分区:
材料科学1区
文献类型:
--
作者:
Cornelia Strauß;René Gustus;Wolfgang Maus-Friedrichs;Simon Schöler;Ulrich Holländer;Kai Möhwald

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奥氏体AISI304和铁素体446(含1.7mBt%Al)样品在10-10mbar的高真空和10-10mbar的工业真空钎焊炉中,在超高真空中进行了高达1200mbar的热处理,基压为10-6mbar。两种氧分压范围对表面和体相成分的影响由XPS、AES和EDX确定,成像由SEM提供。对于AISI 304,我们在两种大气中观察到相似的行为和表面氧化层的去除。对于AISI446,我们观察到对大气的强烈依赖。在高真空下进行热处理,在表面形成了一层厚厚的氧化铝涂层,阻止了与铜银共晶的润湿。超高真空热处理没有导致氧化铝的生成,但在表面观察到了钛等外来元素的碳化物生成。
Specimens of austenitic AISI 304 and ferritic 446 (contains 1.7 wt.% Al) underwent heat treatments up to 1200 °C in ultrahigh vacuum (UHV) in an analysis chamber with a base pressure of 10-10mbar and high vacuum (HV) in an industrial vacuum brazing furnace with a base pressure of 10-6mbar. The effect of the two oxygen partial pressure ranges on surface and bulk composition was determined by XPS, AES and EDX, imaging was provided by SEM.For AISI 304, we observe similar behavior for both atmospheres and the removal of the surface oxide layer. For AISI 446, we observe a strong dependency on the atmosphere. Heat treatment in high vacuum yielded a thick aluminum oxide layer on the surface that inhibited wetting with copper silver eutectic. Heat treatments in ultrahigh vacuum did not lead to aluminum oxide formation but rather carbide formation of foreign elements such as titanium was observed on the surface.
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