45Cr9Si3马氏体气阀钢铸坯夹杂物解析  

Analysis of inclusion in 45Cr9Si3 martensitic valve steel die casting billet

作　　者：黄宗瑗 宋光洁 徐翔宇 刘斌 付建勋 HUANG Zongyuan;SONG Guangjie;XU Xiangyu;LIU Bin;FU Jianxun(Center for Advanced Solidification Technology(CAST)of School of Materials Science and Engineering,Shanghai University,State Key Laboratory of Advanced Special Steel,Shanghai 200444,China;Ansteel Beijing Reasearch Institude Co.,Ltd.,Beijing 102200,China)

机构地区：[1]上海大学材料科学与工程学院先进凝固技术中心,省部共建高品质特殊钢冶金与制备国家重点实验室,上海200444 [2]鞍钢集团北京研究院有限公司,北京102200

出　　处：《冶金分析》2025年第1期19-26,共8页Metallurgical Analysis

基　　金：国家自然科学基金资助项目(52074179)。

摘　　要：45Cr9Si3钢属于中碳马氏体气阀钢,钢中夹杂物的数量、大小、种类和分布对45Cr9Si3钢性能及服役寿命影响很大。本文借助金相显微镜、扫描电镜(SEM)、能谱分析仪(EDS),以及电解三维腐刻仪对45Cr9Si3钢模铸坯中夹杂物进行解析,使用Thermo-Calc热力学软件计算45Cr9Si3马氏体气阀钢的相转变和夹杂物析出行为。结果表明:在45Cr9Si3钢铸坯中夹杂物类型主要以MgO、TiN和MgO·Al2O3为主。夹杂物的形貌在二维下以方形、不规则形态、圆形为主,在三维下多是以立方体、不规则立方体、球体为主;夹杂物面积占比分布在0.018%~0.029%;由铸坯边部到心部,夹杂物的尺寸逐渐增大;夹杂物平均尺寸由边部的2.3μm增长到心部的3.0μm;夹杂物数量密度逐渐增小,由边部的36个/mm^(2)降低到心部的21个/mm^(2)。45Cr9Si3 steel belongs to the medium-carbon martensitic valve steel.The quantity,size,type and distribution of inclusions in the steel have a great impact on the performance and service life of 45Cr9Si3 steel.The analysis and control of microstructure,morphology,quantity and distribution of inclusions in steel are of great significance for the improvement of the properties of steel.In this paper,the inclusions in 45Cr9Si3 steel die casting billet were analyzed by means of metallographic microscope,scanning electron microscope(SEM),energy dispersive spectrometer(EDS) and electrolysis three-dimensional corrosion meter.The phase transition and inclusion precipitation behavior of 45Cr9Si3 martensitic valve steel were calculated by Thermo-Calc.The results showed that MgO,TiN and MgO·Al2O3 were the main inclusions in 45Cr9Si3 steel casting billet.The morphology of inclusions was mainly square,irregular and round in two dimensions,and it was mainly cube,irregular cube and sphere in three dimensions.The proportion of inclusion area was in range of 0.018%-0.029%.The size of inclusions increased gradually from the edge of the casting billet to the core.The average size of inclusions increased from 2.3 μm at the edge to 3.0 μm at the core.The number density gradually decreased from 36 per square meter at the edge to 21 per square meter at the core.

关 键 词：45Cr9Si3钢 气阀钢 模铸坯 夹杂物 扫描电镜(SEM) 电解三维腐刻仪 

分 类 号：O657[理学—分析化学] TF76[理学—化学]