李杰,胡建文,陆子彤

• 1:河北科技大学材料科学与工程学院
• 2:河北省材料近净成形重点实验室
• 3:河北省高温合金熔模铸造技术创新中心

摘要(Abstract)：

为了研究高温时效对GX40CrNiSi25-12奥氏体耐热铸钢析出相的影响,采用JMatPro软件模拟其在不同温度下的平衡相图和析出相随温度的变化,通过光学显微镜、扫描电镜和能谱分析等研究了不同温度时效处理对试验钢的析出相的形态、大小、析出位置及硬度的影响。结果表明:850℃时效24 h后,大量细小颗粒状的M_(23)C_6碳化物在基体奥氏体晶粒内析出,在奥氏体晶粒内还发现有少量细针状σ相析出,同时在枝晶处出现密集分布的块状σ相,试验钢的硬度显著升高,达到最大值;950℃时效24 h后,晶内析出相减少,颗粒状M_(23)C_6碳化物偏聚在枝晶附近析出,且出现集聚和长大,导致试验钢的硬度显著下降;1050℃时效24 h后,枝晶骨架中的一次碳化物基本溶入基体中,在晶界处分散的颗粒状M_(23)C_6相呈链状分布,无σ相存在。

关键词(KeyWords)： 奥氏体耐热铸钢;高温时效;析出相;热力学模拟;微观组织

Abstract:

Keywords:

基金项目(Foundation):

作者(Author): 李杰,胡建文,陆子彤

DOI: 10.13289/j.issn.1009-6264.2021-0310

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