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万明攀,温鑫,马瑞,赵永庆.连续冷却条件下Ti-1300合金的组织演变与连续转变图[J].稀有金属材料与工程(英文),2019,48(1):97~103.[MingPan Wan,Xin Wen,Rui Ma and YongQing Zhao.Microstructural Evolution and Continuous Cooling Transformation Diagram in Ti-1300 Alloy under Continuous Cooling Condition[J].Rare Metal Materials and Engineering,2019,48(1):97~103.]
Microstructural Evolution and Continuous Cooling Transformation Diagram in Ti-1300 Alloy under Continuous Cooling Condition
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Received:July 18, 2017  Revised:August 18, 2017
DOI:
Key words: Ti-1300 alloy  microstructural evolution  transformation diagram  continuous cooling  microhardness
Foundation item:国家自然科学基金项目(面上项目,重点项目,重大项目)
Author NameAffiliation
MingPan Wan,Xin Wen,Rui Ma and YongQing Zhao  
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Abstract:
      Microstructural evolution of Ti-1300 alloys was investigated using an optical microscopy, scanning electron microscopy, transmission electron microscopy and electron backscatter diffraction during continuous cooling. Then, a continuous cooling transformation diagram was established using dilatometric method, and the different kinds of β phase decomposition modes in the alloy under continuous cooling were investigated in detail. Moreover, the β → α + β phase transformation and colony structures are observed for low cooling rates. When the cooling rate is from 0.3 °C/s to 1.5 °C/s, the β → α + β + βm phase transformation and needle-like structures are observed in the alloy. However, when the cooling rate exceeds 3 °C/s, the alloy is only composed of a single metastable β phase. Thus, a rate of 3 °C/s is considered as critical cooling rate of the alloy under continuous cooling condition. The concentration gradient of molybdenum equivalent is considered as a driving force of α phase growth in the alloy.The microhardness of the alloy initially increases and then decreases with increasing of the cooling rate. When the cooling rate is 0.3 °C/s, the microhardness of the alloy reaches its maximum.