晶粒形态对HR3C耐热不锈钢时效脆性的影响  

Effect of Grain Morphology on Aging Brittleness of HR3CHeat-Resistant Stainless Steel

作　　者：宋爱玲 曹铁山[1,2] 程从前 赵杰[1] SONG Ailing;CAO Tieshan;CHENG Congqian;ZHAO Jie(School of Materials Science and Engineering;State Key Laboratory of Structural Analysis for Industrial Equipment,Dalian University of Technology,Dalian 116024,China)

机构地区：[1]大连理工大学材料科学与工程学院,大连116024 [2]大连理工大学工业装备结构分析国家重点实验室,大连116024

出　　处：《机械工程材料》2022年第3期51-56,共6页Materials For Mechanical Engineering

基　　金：国家自然科学基金重点资助项目(U1610256,51901035)。

摘　　要：通过热锻+固溶处理制备了具有3种晶粒形态(细小、粗大和伸长)的HR3C钢,研究了其在700℃时效500~2000h后的显微组织、析出相形貌、硬度和冲击韧性,探讨了晶粒形态对其时效脆性的影响。结果表明:具有粗大晶粒的HR3C钢晶粒尺寸分布均匀,M_(23)C_(6)碳化物沿晶界连续析出,硬度及冲击韧度低,时效后呈脆性断裂;具有细小晶粒的HR3C钢晶粒尺寸分布均匀,M_(23)C_(6)碳化物在晶界呈链状分布,硬度和冲击韧度较高,时效后呈脆性和韧性混合断裂;具有伸长晶粒的HR3C钢晶粒尺寸分布不均匀,M_(23)C_(6)碳化物在晶界分布较不连续,硬度和冲击韧度高,时效后呈韧性断裂。HR3Csteels with three grain morphologies(fine,coarse and elongated)were prepared by hot forging and solution treatment.The microstructure,precipitation morphology,hardness and impact toughness were investigated after aging at 700℃for 500-2000h,and the effect of grain morphology on aging brittleness was discussed.The results show that HR3Csteel with coarse grains had uniform grain size distribution,and M_(23)C_(6) carbides continuously precipitated along grain boundaries.The steel had low hardness and impact toughness,and exhibited brittle fracture after aging.HR3Csteel with fine grains had uniform grain size distribution,M_(23)C_(6) carbides were distributed in chains at grain boundaries.The steel had higher hardness and impact toughness,and exhibited a mixed fracture of brittleness and ductility after aging.HR3Csteel with elongated grains had an uneven grain size distribution,and M_(23)C_(6) carbides had a discontinuous distribution grain boundaries.The steel had high hardness and impact toughness,and exhibited ductile fracture after aging.

关 键 词：HR3C钢 时效脆性 晶粒形态 析出相 

分 类 号：TG142.1[一般工业技术—材料科学与工程]