摘要
利用热膨胀法结合金相法-硬度法测定一种新型低成本GDL-4高速钢过冷奥氏体的连续冷却转变曲线（CCT图）；分析该钢连续冷却过程中转变产物的组织和硬度特征。结果表明：除珠光体相变和马氏体M相变外．该钢在303～383℃转变温度区间有贝氏体相变区；Acl为890℃；过冷奥氏体的临界冷却速度为30℃／min；冷速在11～15℃／min时得到贝氏体与珠光体的混合组织，冷速≤10℃／min得到完全的珠光体。
The curves of Continuous Cooling Transformation （CCT） of supercooled austenite for a new low-cost high-speed steel （GDL-4） were measured by expansion instrument and Metallographic-Hardness method. The microstructure and hardness characteristic of the steel＇s transformation during the continuous cooling process were analysed. Results show that not only pearlite and martensite phase transition can be obtained at different temperature, but bainite phase zone can be obtained at the temperature from 303 ℃ to 383 ~C as well. The Ad of the steel is 890 ℃ and the critical cooling rate of the steel is 30 ℃/min. The bainite and pearlite can be obtained at range of cooling rate from 15 ℃/min to 11 ℃/min. The pearlite can be obtained when the cooling rate is less than 10 ℃/min.
出处
《兵器材料科学与工程》
CAS
CSCD
北大核心
2008年第6期34-37,共4页
Ordnance Material Science and Engineering
