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采用热模拟实验研究了等温温度对V-Ti微合金钢组织性能及相间析出行为的影响规律,利用OM和TEM分析了不同等温温度下实验钢的组织特征.结果表明,不同等温温度下均可得到大量铁素体组织,随等温温度的降低,铁素体体积分数增加,铁素体晶粒尺寸减小.不同等温温度下均可观察到平面相间析出,且降低等温温度可显著细化相间析出列间距和析出粒子尺寸.纳米碳化物具有NaCl型晶体结构,晶格常数约为0.436 nm,同铁素体基体满足(100)carbide//(100)ferrite和[011]carbide//[001]ferrite的B-N关系.在680℃下等温30 min,沉淀强化量可达到360.6 MPa.

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