梁晨,车洪艳,刘少尊,秦巍,沈漪,庞亚龙,曹睿

• 1:安泰科技股份有限公司
• 2:河北省热等静压工程技术研究中心
• 3:兰州理工大学省部共建有色金属先进加工与再利用国家重点实验室
• 4:兰州理工大学材料科学与工程学院

摘要(Abstract)：

使用扫描电镜(SEM)、X射线衍射(XRD)、Image-J图像处理软件等研究了轧制态超高合金粉末钢在热处理过程中不同阶段的碳化物演变行为。结果表明：轧制态超高合金粉末钢的组织主要由铁素体、马氏体基体和M_(23)C_6、M_7C_3及MC 3种类型碳化物组成。随着热处理的进行，碳化物的平均尺寸和最大尺寸以及团聚状碳化物的数量呈现出先降低-后增加-再降低-再增加的变化趋势，碳化物的数量则表现为先降低-后增加-再降低的变化趋势；M_(23)C_6型碳化物随着热处理温度的升高其含量逐渐减少，在1000℃等温3 h后，M_(23)C_6型碳化物大部分分解回溶，在降温阶段该型碳化物再次析出；在整个热处理过程中MC型碳化物几乎没有发生变化，M_7C_3型碳化物没有发生向M_(23)C_6型碳化物的转变；随着热处理的进行，超高合金粉末钢耐蚀性表现为先升高-后降低-再升高-再降低的变化趋势，当奥氏体化保温3 h后，试验钢的自腐蚀电流密度达到了最小值，耐蚀性最佳。

关键词(KeyWords)： 超高合金粉末钢;热处理;碳化物;耐蚀性

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(52175325,51961024,52071170)

作者(Author): 梁晨,车洪艳,刘少尊,秦巍,沈漪,庞亚龙,曹睿

DOI: 10.13289/j.issn.1009-6264.2022-0024

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