王刘行,杨银辉,刘泽辉,曹建春

• 1:昆明理工大学材料科学与工程学院

摘要(Abstract)：

采用物理模拟方法研究了18.3Cr-11.0Mn-0.06Ni-0.19N超低Ni型双相不锈钢在热压缩温度为1123～1423 K、应变速率为0.01～10 s~(-1)和50%变形量条件下的热压缩变形行为。结果表明：试验钢的热压缩软化以铁素体动态回复(DRV)为主，且伴随有少量的两相动态再结晶(DRX)发生，温度升高会促进铁素体发生DRV,有利于在应变速率为0.1 s~(-1)变形时部分奥氏体位错胞向DRX组织的转变。变形温度为1223 K时，随应变速率提高，应变逐渐向奥氏体相转移。再结晶临界应变主要发生在1123～1323 K/0.1～1 s~(-1)范围，应变速率与变形温度相比对其影响较大。确定了试验钢热变形方程和激活能(430.6 kJ/mol),结合热加工图和压缩裂纹特征确定了试验钢的最佳热加工参数范围为0.31～0.77 s~(-1)/1300～1390 K,失稳区主要集中在2.7～10 s~(-1)高应变速率区。高Mn添加导致低温变形时加工硬化率增加，促进了1123 K变形时楔形裂纹形成。

关键词(KeyWords)： 超低镍双相不锈钢;热变形;动态回复;热加工图;楔形裂纹

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(51461024,51861019)

作者(Author): 王刘行,杨银辉,刘泽辉,曹建春

DOI: 10.13289/j.issn.1009-6264.2021-0551

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