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首页> 外文期刊>Journal of Materials Engineering and Performance >Comparison of Inclusions in Cold Drawn Wire and Precursor Hot-Rolled Rod Coil in VIM-VAR Nickel-Titanium Alloy
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Comparison of Inclusions in Cold Drawn Wire and Precursor Hot-Rolled Rod Coil in VIM-VAR Nickel-Titanium Alloy

机译：VIM-VAR镍钛合金冷拔丝和前体热轧棒材中夹杂物的比较

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摘要

Inclusion content is important for the mechanical behavior and performance of Nitinol wires, particularly in fatigue-rated devices. The purpose of this work was to make a quantitative comparison between inclusion populations in cold drawn wires and the precursor populations in hot-rolled rod coil. Inclusion content was examined in a series of VIM-VAR alloys with different transformation temperatures (TTR) controlled by the Ni to Ti ratio. This range of chemistry was chosen to assess the effect of Ni to Ti ratio on inclusion formation. In order to understand the differences in behavior between carbides and intermetallic oxides in wire drawing, carbides, and intermetallic oxide inclusions were measured separately using optical metallography pursuant to ASTM F2063. In VIM-VAR alloys at higher Ni to Ti ratios about 50.79 a/o Ni the formation of intermetallic oxides appears to be suppressed in the as-cast material through the presence of carbon and the precipitation of eutectic TiC in place of eutectic Ti4Ni2O x . The structure of VIM-VAR alloy also varies after hot working depending on the TTR of the alloy. Higher TTR binary alloys with lower Ni to Ti ratios tend to have more and larger intermetallic oxides and fewer and smaller carbides after hot working. Microsegregation plays a role in inclusion formation. That is, during solidification, C, O, N diffuse to the interdendritic regions. This increases the potential for the precipitation of nonmetallic species. Carbides and intermetallic oxides behave differently in hot working and cold drawing. The change in maximum carbide size from coil to wire is very near zero for all Ni to Ti ratios. The change in maximum inclusion size from coil to wire is driven mainly by the fracture of intermetallic oxides and the formation of intermetallic oxide stringers.
机译：夹杂物含量对于镍钛诺线材的机械性能和性能非常重要，特别是在疲劳等级设备中。这项工作的目的是对冷拔钢丝中的夹杂物数量和热轧棒卷中的前驱物数量进行定量比较。在一系列具有不同转变温度（TTR）的VIM-VAR合金中检查了夹杂物含量，这些转变温度受Ni与Ti的比例控制。选择该化学范围以评估Ni与Ti之比对夹杂物形成的影响。为了理解拉丝过程中碳化物和金属间氧化物之间行为的差异，根据ASTM F2063，使用光学金相学分别测量了碳化物和金属间氧化物夹杂物。在Ni / Ti较高的Ni / Ti比约为50.79 a / o的VIM-VAR合金中，似乎通过铸态材料中的碳和共晶TiC的沉淀来代替共晶Ti 4 Ni 2 O x 。热加工后，VIM-VAR合金的结构也会根据合金的TTR而变化。在Ni和Ti之比较低的情况下，较高TTR的二元合金在热加工后往往具有越来越大的金属间氧化物以及越来越少的碳化物。微偏析在包裹体形成中起作用。即，在固化期间，C，O，N扩散到树突间区域。这增加了非金属物质沉淀的可能性。碳化物和金属间氧化物在热加工和冷拔过程中表现不同。对于所有Ni与Ti的比率，从线圈到导线的最大碳化物尺寸变化都非常接近于零。从卷材到焊丝的最大夹杂物尺寸的变化主要是由金属间氧化物的断裂和金属间氧化物纵梁的形成所驱动。

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