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Y12Cr18Ni9易切削钢铸态组织及力学性能研究

王英虎 郑淮北 方轶 刘庭耀 王利伟 姚斌

王英虎, 郑淮北, 方轶, 刘庭耀, 王利伟, 姚斌. Y12Cr18Ni9易切削钢铸态组织及力学性能研究[J]. 钢铁钒钛, 2022, 43(6): 166-172. doi: 10.7513/j.issn.1004-7638.2022.06.025
引用本文: 王英虎, 郑淮北, 方轶, 刘庭耀, 王利伟, 姚斌. Y12Cr18Ni9易切削钢铸态组织及力学性能研究[J]. 钢铁钒钛, 2022, 43(6): 166-172. doi: 10.7513/j.issn.1004-7638.2022.06.025
Wang Yinghu, Zheng Huaibei, Fang Yi, Liu Tingyao, Wang Liwei, Yao Bin. As-cast microstructure and mechanical properties of Y12Cr18Ni9 free-cutting steel[J]. IRON STEEL VANADIUM TITANIUM, 2022, 43(6): 166-172. doi: 10.7513/j.issn.1004-7638.2022.06.025
Citation: Wang Yinghu, Zheng Huaibei, Fang Yi, Liu Tingyao, Wang Liwei, Yao Bin. As-cast microstructure and mechanical properties of Y12Cr18Ni9 free-cutting steel[J]. IRON STEEL VANADIUM TITANIUM, 2022, 43(6): 166-172. doi: 10.7513/j.issn.1004-7638.2022.06.025

Y12Cr18Ni9易切削钢铸态组织及力学性能研究

doi: 10.7513/j.issn.1004-7638.2022.06.025
详细信息
    作者简介:

    王英虎,1992年出生,男,河北衡水人,硕士,工程师,主要研究方向为先进金属材料及加工技术,E-mail:hihihowareyou@163.com

  • 中图分类号: TF76,TG142.71

As-cast microstructure and mechanical properties of Y12Cr18Ni9 free-cutting steel

  • 摘要: 以Y12Cr18Ni9易切削钢为研究对象,借助Factsage热力学计算软件、扫描电镜、Phenom Partical X扫描电镜-能谱仪对其铸态组织及力学性能进行研究。结果表明:Y12Cr18Ni9易切削钢中的平衡相主要有Liquid、MnS、δFerrite、Austenite、M23C6、Ferrite与Sigma。平衡凝固和冷却相变路径为:Liquid→Liquid+δFerrite→Liquid+δFerrite+Austenite→Liquid+δFerrite+MnS+Austenite→δFerrite+MnS+Austenite→MnS+Austenite→MnS+M23C6+Austenite→MnS+M23C6+Austenite+Ferrite→MnS+M23C6+Sigma+Austenite+Ferrite。试验钢中的硫化物呈球形、椭球形、纺锤形或短棒状并以簇状沿晶界分布,属于第Ⅱ类硫化物,长宽比≤3的硫化物占比达到了94.75%,尺寸≤3 μm的硫化物所占比例为80.22%,最大弦长≤3 μm的硫化物所占比例为76.02%。簇状硫化物会影响Y12Cr18Ni9易切削钢的力学性能,沿晶界分布的簇状硫化物是形成准解理面的主要原因。经室温拉伸及冲击试验测试,其抗拉强度、屈服强度、断后伸长率、断面收缩率和冲击功分别为597 MPa、233 MPa、17.7%、19.5%和21.8 J。
  • 图  1  Y12Cr18Ni9易切削钢FactSage软件模拟平衡相图

    Figure  1.  Equilibrium phase diagram of Y12Cr18Ni9 free-cutting steel predicated by FactSage software

    图  2  Y12Cr18Ni9易切削钢的平衡凝固及冷却相变路径

    Figure  2.  Phase transition path of the Y12Cr18Ni9 free-cutting steel during equilibrium solidification and cooling

    图  3  规格为Ø230 mm的Y12Cr18Ni9易切削钢横截面低倍组织

    Figure  3.  Macrostructure of Ø230 mm Y12Cr18Ni9 free-cutting steel on cross-section

    图  4  Y12Cr18Ni9易切削钢中典型硫化物SEM形貌及元素分布

    Figure  4.  The SEM micrograph(a) and element mapping(b~d) typical sulfides in the Y12Cr18Ni9 free-cutting steel

    图  5  Y12Cr18Ni9易切削钢中硫化物长宽比分布

    Figure  5.  Distribution of length-width ratio of sulfides in the Y12Cr18Ni9 free-cutting steel

    图  6  Y12Cr18Ni9易切削钢中夹杂物尺寸与最大弦长分布

    Figure  6.  Distribution of size and maximum chord length of sulfides in the Y12Cr18Ni9 free-cutting steel

    图  7  Y12Cr18Ni9易切削钢铸态工程应力-应变曲线

    Figure  7.  Engineering stress-strain curves of the as-cast Y12Cr18Ni9 free-cutting steel

    图  8  Y12Cr18Ni9易切削钢拉伸试样扫描断口形貌

    Figure  8.  Scanning fracture morphology of tensile specimen of the Y12Cr18Ni9 free-cutting steel

    图  9  Y12Cr18Ni9易切削钢冲击试样扫描断口形貌

    Figure  9.  Scanning fracture morphology of impact specimen of the Y12Cr18Ni9 free-cutting steel

    表  1  Y12Cr18Ni9易切削钢的化学成分

    Table  1.   Chemical composition of the Y12Cr18Ni9 free-cutting steel %

    CMnSiNiCrMoAlPHONSSnCaMgFe
    0.0351.830.2737.7916.240.1980.00110.0120.000470.00710.0110.1750.0036<0.0005<0.0005Bal.
    下载: 导出CSV
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  • 收稿日期:  2022-03-09
  • 刊出日期:  2023-01-13

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