Influence of Trace Elements on Hot Ductility of an Ultra High Purity Invar Alloy
Influence of Trace Elements on Hot Ductility of an Ultra High Purity Invar Alloy
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DOI：
10.1051/jp4:1995739
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发表时间：
1995-11
期刊：
影响因子：
--
通讯作者：
M. Perrot-Simonetta;A. Kobylanski
中科院分区：
文献类型：
--
作者：
M. Perrot-Simonetta;A. Kobylanski
与钢一样，奥氏体因瓦合金Fe-Ni 36%在500°C到1100°C之间表现出很大的塑性低谷。为了了解热脆机制，特别是微量元素的影响，用掺入一定数量的碳、硫、硼、铝和氮的超高纯铁和镍制备了合成合金。对四种合成合金进行了研究，以确定硫的内在影响，硫与AlN或BN等析出物的联合作用，以及在硫存在下的硼对塑性和断裂机制的影响。我们提出了几种机制来解释每一种研究合金的延性损失和恢复，然后定义了这些机制控制延性的温度场。
Like steels, austenitic INVAR alloys Fe-Ni 36 % show a large ductility trough between 500°C and 1100°C. To understand hot brittleness mechanisms and especially trace element effects, synthetic alloys were prepared using ultra-high purity iron and nickel doped with selected amounts of carbon, sulphur, boron, aluminium, and nitrogen. Four kinds of synthetic alloys were studied to establish the intrinsic influence of sulphur, the combined effects of sulphur and precipitates such AIN or BN, and the effect of boron in the presence of sulphur, on ductility and fracture mechanisms. We propose several mechanisms to explain the loss and the recovery of ductility for each of the studied alloys, and then define the field of temperatures where these mechanisms control ductility.