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研究了曲轴用非调质钢C38N2在不同加热温度和加热时间下的奥氏体晶粒长大行为及高温下的热塑性,并建立了奥氏体晶粒长大的数学模型。结果表明,加热时间30 min时,奥氏体晶粒粗化温度和铌迅速大量固溶的开始温度为1050℃;在900~1050℃和1050~1250℃两个温度区间内,奥氏体晶粒长大方程分别为D=1.01×103·t0.21·exp(-5.33×104/(RT))和D=8.77×106·t0.21·exp(-1.59×105/(RT));高热塑性温度范围为800~1200℃,1100℃时热塑性最好。
The austenite grain growth behavior and the high temperature thermoplasticity of non-quenched and tempered steel C38N2 for crankshaft at different heating temperature and heating time were studied. A mathematical model of austenite grain growth was also established. The results show that when the heating time is 30 min, the austenite grain coarsening temperature and the rapid solid solution start of niobium are 1050 ℃. In the temperature range of 900 ~ 1050 ℃ and 1050 ~ 1250 ℃, the austenite grain size The grain growth equation is respectively D = 1.01 × 103 · t0.21 · exp (-5.33 × 104 / (RT)) and D = 8.77 × 106 · t0.21 · exp (-1.59 × 105 / (RT)); High thermoplastic temperature range of 800 ~ 1200 ℃, 1100 ℃ thermoplastic best.