Effect of Mg content on the hot ductility of wrought Fe-36Ni alloy with Ti addition
Effect of Mg content on the hot ductility of wrought Fe-36Ni alloy with Ti addition
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Mg含量对Ti添加变形Fe-36Ni合金热塑性的影响
DOI：
10.1016/j.msea.2016.07.070
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发表时间：
2016-09
期刊：
影响因子：
--
通讯作者：
Li Changrong李长荣）
中科院分区：
文献类型：
--
作者：
He Yutian何煜天）;Wang Fuming王福明）;Li Changrong李长荣）
奥氏体合金在连续铸造和热加工过程中由于其较差的热塑性而易于开裂。在这项研究中，进行了热拉伸试验，以研究Mg含量对Fe-36 Ni合金在700-1200 °C温度范围内在10−2s−1应变速率下的热塑性的影响。Mg含量对颗粒的影响（即，夹杂物和析出物）特性和奥氏体晶粒的长大。结果表明，随着实验合金中镁含量的增加，颗粒的数量密度显着增加，而平均直径则减小。固溶处理过程中，镁处理合金中的钉扎颗粒有效地抑制了奥氏体晶粒的长大。钉扎颗粒和奥氏体晶粒尺寸对合金的热塑性行为有显著影响。研究合金的热塑性曲线在中温区具有不同的趋势，并受动态再结晶（DRX）和晶界滑移（GBS）的竞争控制。与未添加Mg的合金相比，添加49 ppm Mg的合金中适量的钉扎颗粒导致固溶处理期间的晶粒尺寸减小，这通过在随后的热拉伸过程中加速动态再结晶而显著改善了合金的热塑性。然而，在添加60 ppm Mg的合金中，在晶界处的钉扎颗粒的过量抑制动态再结晶和促进GBS在热拉伸过程中，这是有害的热塑性。相比之下，合金在较高的温度下表现出类似的热塑性槽，表明Mg在这些温度下对热塑性只有轻微的影响。
Austenitic alloys are prone to cracking as a result of their poor hot ductility during continuous casting and hot working processes. In this study, hot tensile tests were performed to study the effect of Mg content on the hot ductility of Fe-36Ni alloy over the temperature range of 700–1200 °C at a strain rate of 10−2s−1. The effects of the Mg content on the particle (i.e., inclusion and precipitate) characteristics and the growth of austenite grains were also investigated. The results indicated that the number density of the particles increased significantly while the mean diameter decreased with increasing Mg content in the experimental alloys. The growth of austenite grains was effectively inhibited by pinning particles in the Mg-treated alloys during solution treatment. Both the pinning particle and austenite grain size markedly affected the hot ductility behaviors of the alloys. The hot ductility curves of the studied alloys had different trends in the intermediate temperature range and were controlled by the competition between dynamic recrystallization (DRX) and grain boundary sliding (GBS). Compared with the alloys without Mg addition, an appropriate number of pinning particles in the alloy with 49 ppm Mg addition resulted in a smaller grain size during the solution treatment, which significantly improved the hot ductility by accelerating DRX during the subsequent hot tensile process. However, an excessive number of pinning particles at grain boundaries in the alloy with 60 ppm Mg addition inhibited DRX and promoted GBS during the hot tensile process, which were detrimental to the hot ductility. In contrast, the alloys exhibited similar hot ductility troughs at higher temperatures, indicating that Mg has only a slight effect on the hot ductility at these temperatures.
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影响因子：
9.4
作者：
Cram, D. G.;Zurob, H. S.;Hutchinson, C. R.
通讯作者：
Hutchinson, C. R.
DOI：
10.1016/j.msea.2011.01.097
发表时间：
2011-04
影响因子：
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通讯作者：
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DOI：
10.1051/jp4:1995739
发表时间：
1995-11
期刊：
Journal De Physique Iv
影响因子：
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作者：
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通讯作者：
M. Perrot-Simonetta;A. Kobylanski
影响因子：
1.8
作者：
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通讯作者：
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DOI：
10.1016/j.msea.2007.01.098
发表时间：
2007-07
影响因子：
6.4
作者：
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通讯作者：
E. López-Chipres;I. Mejía;C. Maldonado;A. Bedolla-Jacuinde;J. Cabrera