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通过金相显微镜、热膨胀仪等分析手段研究了热镀锌DP钢奥氏体及临界区连续冷却组织演变规律。结果表明:实验钢成分设计决定了钢的淬透性和临界冷却速度,冷速大于15℃/s时,基本可得到F+M的双相组织。部分奥氏体化CCT曲线与完全奥氏体化CCT曲线形状相似,但前者相对于后者普遍上移和左移,且上移比较明显。
The microstructure evolution of austenite and critical cooling zone of hot-dip galvanized DP steel was studied by metallographic microscope and thermal dilatometer. The results show that the experimental steel composition design determines the hardenability and critical cooling rate of steel. When the cooling rate is more than 15 ℃ / s, the duplex structure of F + M can be obtained basically. The partial austenitizing CCT curve is similar to the fully austenitized CCT curve, but the former generally moves up and moves left relative to the latter, and the up-shift is obvious.