【摘要】 控制VN在奥氏体中的有效析出是利用VN诱导晶内铁素体细化铁素体晶粒的关键技术。采用应力松弛方法研究了低碳钒氮微合金钢中V(C,N)在奥氏体区的等温析出行为。结果表明:试验钢的析出 温度 时间曲线(PTT)呈典型的C形,本试验条件下析出开始时间最短的"鼻子"温度为870℃左右。钢中的碳、氮含量以及变形量对PTT曲线有较大影响,它们增加均使C曲线向左移,特别是氮含量对V(C,N)析出的影响最显著。在碳含量约为0 10%的试验钢中,当氮含量从0 0036%增加到0 0140%时,可使870℃的析出开始时间从400s缩短到70s左右。更多还原

【Abstract】 The isothermal precipitation of V(C, N) in austenite of low carbon steel microalloyed with vanadium and nitrogen was investigated by the stress relaxation method on Gleeble hot simulator. The results show that the shape of precipitation-temperature-time (PTT) is typical C curve, and the fastest precipitation is at about 870 ℃. Increase of carbon, nitrogen content and deformation can accelerate the precipitation, and the influence of nitrogen content is most remarkable. The precipitation start time is reduced from about 400 s to 70 s for steel with carbon of 0.11 % when the nitrogen content is increased from 0.003 6 % to 0.014 0 %.更多还原