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首页> 外文会议>China-Russia Symposium on New Materials and Technologies; 20051102-05; Guangzhou(CN) >The effect of tempering temperature on the microstructure and mechanical properties of ultrahigh strength 23CoNi steel plate
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The effect of tempering temperature on the microstructure and mechanical properties of ultrahigh strength 23CoNi steel plate

机译：回火温度对超高强度23CoNi钢板组织和力学性能的影响

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摘要

The effect of tempering temperature on microstructure and mechanical properties of 23CoNi steel plate has been studied. Tempering in the temperature range of 100-460℃, the ultimate tensile strength σ_b tends to change along a curve which has the shape of the letter "n", the peak of the σ_b occurs in the range of 460-475℃, beyond the peak, σ_b deceasing as the temperature increasing. Tempering in the temperature range of 100-200℃, the impact property α_(ku) increases as the temperature goes up. After 200℃, α_(ku) goes down as the temperature increases, when the tempering temperature goes higher than 460℃, α_(ku) goes up a-gain tempering at higher than 485℃, the acicular alloying carbides M_2C precipitate from matrix. The orientation relationship between M_2C and matrix coincides with follows: (011)_α∥(001)_(M_2C), [100]_α∥[100]_(M_2C). We found out a new order phase B2 which dispersing in the matrix and the size is very small. This paper discusses the reason of the formation of this new order phase and the sequence of effects to mechanical properties. With the increasing of the tempering temperature, both M_2C and new order phase growing up. As the tempering temperature goes beyond 470℃, the amount of retained austenite tends to go up, higher than 510℃, the growing up of reverted austenite is accelerative. It is identified that retained austenite is coming from the reverse transformation. Tempered at higher than 550℃, we can easily find the reversion austenite which contains much more Nickel than matrix does and emerged in the bulk form under TEM.
机译：研究了回火温度对23CoNi钢板组织和力学性能的影响。在100-460℃的温度范围内回火，极限抗拉强度σ_b趋向于沿具有字母“ n”形状的曲线变化，σ_b的峰值出现在460-475℃的范围内，超过峰值，σ_b随温度升高而降低。在100-200℃的温度范围内回火，冲击性能α_（ku）随着温度的升高而增加。 200℃后，随着温度的升高，α_（ku）随温度升高而降低，当回火温度高于460℃时，α_（ku）在高于485℃时又发生α-回火回升，针状合金碳化物M_2C从基体中析出。 M_2C与矩阵的取向关系符合：（011）_α∥（001）_（M_2C），[100]_α∥[100] _（M_2C）。我们发现了一个新的有序相B2，它分散在基体中，尺寸很小。本文讨论了形成该新阶相的原因以及对机械性能的影响顺序。随着回火温度的升高，M_2C和新序相都在增长。当回火温度超过470℃时，残余奥氏体量趋于增加，高于510℃，还原奥氏体的生长会加速。可以确定残留奥氏体来自逆相变。在高于550℃的温度下回火，我们可以很容易地找到比基体中镍含量高得多且在TEM下以块状形式出现的还原奥氏体。

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