贾璐,李永堂,李振晓

• 1:太原科技大学材料科学与工程学院
• 2:太原科技大学金属材料成性理论与技术山西省重点实验室

摘要(Abstract)：

利用热力模拟实验研究铸态耐热合金钢T/P91材料在热加工温度范围900~1200℃、应变速率范围0.01~5 s-1、变形量60%、70%下的真应力-应变曲线,并建立铸态T/P91合金钢的热变形本构方程;利用DMM动态材料模型计算出铸态T/P91合金钢在热变形中的耗散因子和流变失稳判据,绘制出热加工图。结果表明,热加工图预测的安全区晶粒组织均匀、组织易出现失稳开裂和组织粗大的缺陷,T/P91合金钢的热加工要避免高温低应变;利用DEFROM-3D软件通过数值模拟研究挤压工艺参数对挤压过程动态再结晶的影响,制定工艺参数为:挤压温度1500~1200℃,挤压比9,挤压速度26~36 mm/s。

关键词(KeyWords)： 厚壁管;铸态T/P91合金钢;热变形;热加工图;组织预测

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(51675361,51135007);; 山西省回国留学人员科研资助项目(2015-086)

作者(Author): 贾璐,李永堂,李振晓

DOI: 10.13289/j.issn.1009-6264.2016.11.026

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