Formation of Austenite During Intercritical Annealing of Dual-Phase Steels
Formation of Austenite During Intercritical Annealing of Dual-Phase Steels
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DOI：
10.1007/bf02643686
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发表时间：
1981-08
期刊：
影响因子：
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通讯作者：
G. Speich;V. Demarest;AN D R. L. Miller
中科院分区：
文献类型：
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作者：
G. Speich;V. Demarest;AN D R. L. Miller
本文研究了含碳0.06 ~ 0.20%的1.5%锰钢在740 ~ 900 ℃的亚温退火过程中奥氏体的形成，奥氏体的形成分为三个阶段：（1）奥氏体迅速长大为珠光体，直至珠光体完全溶解;（2）在高温（~ 850 ℃）下，奥氏体以由奥氏体中的碳扩散控制的速率，以及在低温（~750 ℃）下，由锰在铁素体中（或沿沿着）扩散控制的速率，较慢地生长成铁素体;以及（3）在奥氏体中锰扩散控制的速率下，铁素体和奥氏体非常缓慢地最终平衡。分析了各个步骤的扩散模型，并与实验结果进行了比较。
The formation of austenite during intercritical annealing at temperatures between 740 and 900 °C was studied in a series of 1.5 pct manganese steels containing 0.06 to 0.20 pct carbon and with a ferrite-pearlite starting microstructure, typical of most dual-phase steels.Austenite formation was separated into three stages: (1) very rapid growth of austenite into pearlite until pearlite dissolution is complete; (2) slower growth of austenite into ferrite at a rate that is controlled by carbon diffusion in austenite at high temperatures (~85O °C), and by manganese diffusion in ferrite (or along grain boundaries) at low temperatures(~750 °C); and (3) very slow final equilibration of ferrite and austenite at a rate that is controlled by manganese diffusion in austenite. Diffusion models for the various steps were analyzed and compared with experimental results.