TC18钛合金SHCCT曲线的测定
SHCCT curve measurement of TC18 titanium alloy
查看参考文献16篇
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文摘
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采用金相法测量了TC18钛合金相变温度,利用L78 RITA型快速加热热膨胀仪,测定了不同焊接冷却速率下TC18钛合金的膨胀量曲线,结合金相分析和硬度测试,得到了不同冷却速率下试样的显微组织和硬度,测绘了TC18钛合金的焊接条件下的CCT曲线。结果表明:TC18钛合金的相变温度为(855 ±5)℃;随着冷却速率增加,析出α相的数量逐渐减少,且由片层状向团簇状结构转变。当冷却速率低于0.8 ℃/s时,α相以片层状形貌析出,当冷却速率高于0.8 ℃/s时,α相以团簇状析出,且析出的片层或团簇状颗粒均随冷却速率的增加而细化;当冷却速率超过10.0 ℃/s后,亚稳β相的转变受到抑制,基本上被完全保留下来。 |
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其他语种文摘
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Phase change temperature of TC18 titanium alloy was measured by means of metallographic observation. The expansion curves of TC18 titanium alloy at different cooling rates were tested by using a rapid thermal expansion instrument (Type L78 RITA). Microstructure and properties of samples at different cooling rates were investigated by means of optical microscopy and microhardness test. Based on above results, the simulated HAZ continuous cooling transformation (SHCCT) curve of TC18 titanium alloy was obtained. The results show that the phase change temperature of TC18 titanium alloy is (855 ±5) ℃. The amount of precipitated α phase is decreased with increasing of cooling rate. Moreover, the structure of precipitated α phase is transformed from lamellar to cluster, when the critical cooling rate is about 0.8 °C/s. The precipitated lamellar or cluster a phase can be refined with the increase of cooling rate. The transformation of metastable β phase is inhibited and can be completely preserved when the cooling rate is more than 10.0 °C/s. |
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来源
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金属热处理
,2016,41(12):81-85 【核心库】
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DOI
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10.13251/j.issn.0254-6051.2016.12.017
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关键词
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TC18钛合金
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热模拟
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金相-硬度法
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膨胀法
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SHCCT曲线
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地址
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1.
中航工业沈阳飞机工业(集团)有限公司, 辽宁, 沈阳, 110034
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中国科学院金属研究所, 沈阳材料科学国家(联合)实验室, 辽宁, 沈阳, 110016
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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0254-6051 |
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学科
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金属学与金属工艺 |
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基金
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国家自然科学基金委员会-上海宝钢集团公司“钢铁联合研究基金”
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文献收藏号
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CSCD:5877175
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