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<p>Through Nb microalloying, the grain size of medium-carbon manganese steel used for 35MnB track links was refined. The growth behavior of austenite grains was investigated under different heating temperatures and holding times. The morphology and evolution patterns of the precipitates were analyzed. Results indicated that as temperature increased, precipitate dissolution was the primary driver of grain size growth. At a holding time of 3600&#xa0;s, abnormal grain coarsening in 0Nb steel commenced at 950°C, while this phenomenon was delayed to 1000°C for 0.011%Nb and 0.019%Nb steels. At 900°C holding for 7200 s, the average grain size of 0Nb steel was 21.46 µm, while 0.011%Nb and 0.019%Nb steels were 19.35 µm and 18.2 µm. The size of spherical Nb-rich precipitates was significantly smaller than that of rectangular Ti-rich precipitates. As the temperature increased, the volume fraction of NbC gradually decreased. The complete dissolution temperatures of NbC in 0.011%Nb and 0.019%Nb steels were 1124°C and 1199°C, respectively. Different models were established to describe the relationship between the steel grain size and temperature and holding time, and the Sellars model provided good consistency between predicted and measured results, offering a reference for the austenite grain growth behavior in 35MnB steel.</p>

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Nb Microalloyed 35MnB New Chain Track Link Steel Austenite Grain Growth Behavior and Its Prediction Model

  • 期刊论文

  • 发表日期：

    2025年11月10日

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  • Jiangbo Deng,
  • Zhengbing Meng,
  • Fan Wu,
  • Zixun He,
  • Meiqiao Wu,
  • Rongxin Lan,
  • Dinghua Feng

摘要

Through Nb microalloying, the grain size of medium-carbon manganese steel used for 35MnB track links was refined. The growth behavior of austenite grains was investigated under different heating temperatures and holding times. The morphology and evolution patterns of the precipitates were analyzed. Results indicated that as temperature increased, precipitate dissolution was the primary driver of grain size growth. At a holding time of 3600 s, abnormal grain coarsening in 0Nb steel commenced at 950°C, while this phenomenon was delayed to 1000°C for 0.011%Nb and 0.019%Nb steels. At 900°C holding for 7200 s, the average grain size of 0Nb steel was 21.46 µm, while 0.011%Nb and 0.019%Nb steels were 19.35 µm and 18.2 µm. The size of spherical Nb-rich precipitates was significantly smaller than that of rectangular Ti-rich precipitates. As the temperature increased, the volume fraction of NbC gradually decreased. The complete dissolution temperatures of NbC in 0.011%Nb and 0.019%Nb steels were 1124°C and 1199°C, respectively. Different models were established to describe the relationship between the steel grain size and temperature and holding time, and the Sellars model provided good consistency between predicted and measured results, offering a reference for the austenite grain growth behavior in 35MnB steel.