Continuous cooling transformation of 36Mn2V steel at different finish rolling temperatures
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摘要: 采用Gleeble-1500熱模擬機,測定了36Mn2V鋼經四種終軋溫度變形后的連續冷卻膨脹曲線,結合金相-硬度法,獲得了該鋼種的連續冷卻轉變曲線.結果表明:隨冷卻速度的增大,實驗鋼的γ/α相變開始溫度逐漸降低,貝氏體相變開始溫度先升高到一個平臺,隨冷卻速度的進一步增加又降低,晶粒細化;隨終軋溫度的降低,實驗鋼的動態連續冷卻轉變曲線整體向左上方移動,網狀鐵素體和晶內鐵素體明顯減少,晶粒略有細化;經四種溫度終軋后以3℃.s-1的冷速冷卻到室溫的四個試樣中,唯獨950℃終軋的試樣中未觀察到貝氏體.Abstract: The continuous cooling transformation (CCT) curves of 36Mn2V steel were obtained on the basis of the expansion curves of continuous cooling at 4 finish rolling temperatures measured on a Gleeble-1500 thermal simulator in combination with metallo-graphic and hardness methods. The experimental results show that with increasing cooling rate the starting temperature of γ/α transformation gradually lowers, but the starting temperature of bainite transformation increases to a plateau and then decreases, and the grains are refined. With the finishing rolling temperature decreasing, the experimental dynamic CCT curves shift to the left and upper wholly, the ferrite along grain boundaries and intra-granular ferrite decrease, and the grains are slightly refined. No bainite appears in the specimen finally rolled at 950 22.
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Key words:
- microalloyed steel /
- rolling /
- cooling /
- phase transitions /
- metallography
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