首页> 外文会议>International Conference on Processing amp; Manufacturing of Advanced Materials; 20060704-08; Vancouver(CA) >Effect of hot deformation and cooling rate on phase transformations in low carbon HN5MVNb bainitic steel
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Effect of hot deformation and cooling rate on phase transformations in low carbon HN5MVNb bainitic steel

机译:热变形和冷却速率对低碳HN5MVNb贝氏体钢相变的影响

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摘要

Deformations at temperatures 900 ℃, 860 ℃, 810 ℃ and 780 ℃ in the consecutive amounts 24%, 20%, 19% and 18.5% were applied to low carbon HN5MVNb bainitic steel using hot compression testing in dilatometer Bahr 805 followed by continuous cooling. The results show clearly that the kinetics of the austenite decomposition were depended on local equilibrium conditions between recovery, recrystallization and phase transformation processes for a given cooling rate. Bainite transformation was accelerated when sample was cooled after deformation at cooling rate 60 ℃/s. At lower cooling rates than 5 ℃/s down to 0.5 ℃/s, bainite transformation was postpone when comparing its kinetics with those for non deformed steel. The bainitic transformation cannot be fitted to a single transformation mechanism owing to the formation of carbides. Different behavior was observed for austenite to ferrite transformation. Usually it was accelerated with consecutive deformations of the steel for all cooling rates used in experiments.
机译:在900℃,860℃,810℃和780℃的温度下连续变形24%,20%,19%和18.5%,对低碳HN5MVNb贝氏体钢进行了热膨胀试验,使用的是Bahr 805膨胀计,然后进行连续冷却。结果清楚地表明,在给定的冷却速率下,奥氏体分解的动力学取决于恢复,重结晶和相变过程之间的局部平衡条件。样品以60℃/ s的冷却速率变形后冷却后,贝氏体转变加速。在比5℃/ s更低的冷却速率下至0.5℃/ s的冷却速率下,与非变形钢的动力学相比,贝氏体转变被推迟了。由于碳化物的形成,贝氏体转变不能适用于单一的转变机制。对于奥氏体到铁素体的转变观察到不同的行为。通常,在实验中使用的所有冷却速率下,钢都会连续变形而加速。

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