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利用热模拟试验机对30CrMnTi钢的奥氏体连续冷却转变(CCT)曲线进行了测定和分析。结果表明:当冷却速度小于1℃/s时,可以得到铁素体+珠光体组织;当冷却速度达到1℃/s时,即出现贝氏体组织;当冷却速度达到10℃/s时,组织基本转变为马氏体。在工业试生产时,通过控制冷却增加在珠光体转变区域的过冷度,同时延长珠光体转变温度区间的停留时间,可以获得晶粒大小合适的铁素体和珠光体组织。
The austenite continuous cooling transformation (CCT) curves of 30CrMnTi steels were measured and analyzed by means of thermal simulator. The results show that when the cooling rate is less than 1 ℃ / s, the ferrite + pearlite structure can be obtained. When the cooling rate reaches 1 ℃ / s, the bainite structure appears. When the cooling rate reaches 10 ℃ / s, The basic transformation of the organization into martensite. In industrial pilot production, ferrite and pearlite with appropriate grain size can be obtained by controlling the cooling to increase the undercooling in the pearlite transformation region while extending the dwell time in the pearlite transformation temperature range.