Transformation Behavior of Austenite of EH36 Ship Plate Steel during Continuous Cooling
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摘要: 利用Gleeble 2000型热模拟试验机对EH36船板钢连续冷却相变行为以及在增速冷却和减速冷却条件下的相变行为进行了研究.结果表明:在连续冷却条件下,在400~650 ℃范围内,冷却速率在4~16 ℃/s时,相变组织以贝氏体组织为主且随着冷速的增大贝氏体的体积分数增加;在冷却速率≥1 ℃/s时,先以一定速率冷却至600 ℃,然后将冷速减半时,其显微组织与半速恒速冷却组织相近;而先以一定速率冷却至600 ℃,然后将冷速加倍时,其显微组织与两倍速恒速冷却的显微组织相近.Abstract: Using Gleeble 2000 thermal-mechanical simulator, the phase transformation behavior of EH36 ship steels was studied after cooling with constant, increasing and decreasing rate, respectively.Results show that the ultimate microstructure is mainly bainite when the cooling rate is 4-16 ℃/s and the temperature is located in the range of 400-650 ℃ during continuous cooling,the proportion of bainite is increasing along with increment of cooling rate;After cooling to 600 ℃ with 1 ℃/s or higher constant rate at first stage and then with the rate of half the initial value,the final microstructure is similar to that achieved after cooling with the second stage rate constantly.Furthermore,if the cooling rate at the second stage is double the initial rate,the microstructure also accord with that achieved after cooling just with the second stage rate.
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Keywords:
- EH36 ship steels /
- austenite /
- continuous cooling /
- phase transformation
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