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Research on the Hot Ductility of Fe-36Ni Invar Alloy
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Research on the Hot Ductility of Fe-36Ni Invar Alloy
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    摘要:

    通過Gleeble-3800熱模擬實(shí)驗(yàn)機(jī)和微機(jī)控制萬能材料試驗(yàn)機(jī)對(duì)Fe-36Ni因瓦合金的熱塑性進(jìn)行了研究。結(jié)果表明：在1050~1200 ℃，由于動(dòng)態(tài)再結(jié)晶出現(xiàn)，合金展現(xiàn)出了良好的熱塑性，這說明在熱加工過程中，終軋溫度不應(yīng)低于1050 ℃。在800~1000 ℃時(shí)，F(xiàn)e-36Ni因瓦合金熱塑性較差，表現(xiàn)為脆性斷裂，晶界滑移是其主要斷裂機(jī)制。經(jīng)氧化后，合金基體產(chǎn)生嚴(yán)重的內(nèi)氧化，內(nèi)氧化層由晶間氧化區(qū)和晶內(nèi)氧化區(qū)組成。壓縮試驗(yàn)表明，在變形過程中，晶間氧化會(huì)導(dǎo)致裂紋的產(chǎn)生，進(jìn)而顯著惡化合金的熱塑性。

    Abstract:

    The hot ductility of Fe-36Ni invar alloy was studied by a Gleeble-3800 thermal-mechanical simulator and a microcomputer control universal material testing machine. The results show that the alloy has a good hot ductility (RA above 70%) at 1050~1200 °C, which illustrates that the alloy might be suitable for the rolling provided the finish rolling temperature does not go below 1050 °C. Dynamic recrystallization occurred and was found to be responsible for the better hot ductility. However, the alloy exhibits a hot ductility drop (RA below 50%) at 800~1000 °C, which is mainly attributed to the presence of the grain boundary sliding. Serious subscales, which had a typical substructure of the intragranular subscale and the intergranular subscale, occurred in the matrix after oxidation. The compression test indicates that the intergranular subscale will lead to the cracks and significantly deteriorate the hot ductility during deformation process.

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于彥沖,陳偉慶,鄭宏光. Research on the Hot Ductility of Fe-36Ni Invar Alloy[J].稀有金屬材料與工程,2014,43(12):2969~2973.[Yu Yanchong, Chen Weiqing, Zheng Hongguang. Research on the Hot Ductility of Fe-36Ni Invar Alloy[J]. Rare Metal Materials and Engineering,2014,43(12):2969~2973.]
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  • 收稿日期:2013-12-21
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  • 在線發(fā)布日期: 2015-04-16
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