Abnormal grain growth mechanism of austenite in high-strength welded steel Q1030
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摘要: 研究了Q1030鋼在不同加熱溫度下的奧氏體晶粒長大現象.在一定溫度范圍內加熱時,Q1030鋼的部分奧氏體晶粒異常長大而出現混晶現象.分析了位于不同位置的析出相粒子對阻礙奧氏體晶粒長大的作用,用熱力學方法計算不同加熱溫度下析出相粒子的大小和體積分數,并得出了析出相粒子釘扎阻力隨加熱溫度的變化關系.結果表明,在一定溫度范圍內釘扎阻力迅速減小,導致部分晶粒異常長大,產生混晶現象.Abstract: Austenite grain growth phenomena of Q1030 steel at different heating temperatures were studied.In a certain heating temperature range,parts of austenite grains in Q1030 steel grow abnormally,leading to mixed grain phenomena.The inhibition effect of precipitated phase particles at different locations on grain growth was analyzed.The size and volume fraction of the particles at different heating temperatures were calculated by thermodynamic methods,and then the relationship between the pinning force of the particles and heating temperature was discussed.The result shows that the pinning force of the particles reduces sharply in a certain temperature range,resulting in the abnormal growth of partial austenite grains and producing the mixed grain phenomena.
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Key words:
- high strength steel /
- heating temperature /
- grain growth /
- precipitates /
- pinning force
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