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Dynamic precipitation and solute hardening in a titanium microalloyed steel containing three levels of manganese

Whywolfman 添加于 2017/12/26 15:12:48  339次阅读 | 0次推荐 | 0个评论

The effect of increasing the manganese concentration on the dynamic precipitation kinetics of TiC was investigated in three microalloyed steels containing 0.1 wt% Ti and 0.5, 1.1 and 1.6% Mn. The lowest manganese level was associated with a carbon concentration of 0.06%, while the remaining two steels contained 0.1% C. Compression tests were carried out in the strain rate range from 10−4 to 10−1 s−1 at testing temperatures of 925, 975 and 1025°C. The dependence of the peak strain on strain rate and composition was established at each of the three temperatures and the dynamic precipitation kinetics (PIT curves) of TiC were determined in this way. The nose of the PTT curve for the dynamic precipitation of TiC in austenite containing 0.1% Ti, 0.5% Mn and 0.06% C is located at about 4s and 1000°C, and is estimated to advance to approximately l s when the carbon concentration is increased to the standard level of 0.1%. By contrast, the nose position for steels of equivalent titanium and carbon concentration (i.e. 0.1% for both elements) shifts to the vicinity of 6 and 7s respectively when the manganese concentration is increased to 1.1 and 1.6%. This phenomenon is discussed in terms of the influence of manganese on the activity coefficient of carbon and on the diffusivity of titanium. The increase in the yield strength and the solute retardation of dynamic recrystallization resulting from the addition of 0.1% Ti are also considered. These effects are compared to the influence of other microalloying additions, such as molybdenum, niobium and vanadium.

作 者:M.G.Akben, T.Chandra, P.Plassiard, J.J.Jonas
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学科领域:工程材料 » 金属材料 » 金属结构材料
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原文链接:http://www.sciencedirect.com/science/article/pii/0001616084900701
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