10CrNi5MoV钢板条M/B组织亚单元对强韧性的影响

材料热处理学报, 2010, 31(10): 63-69.

10CrNi5MoV钢板条M/B组织亚单元对强韧性的影响

罗志俊 ^1, , 沈俊昶 ^2, , 苏航 ^3, , 丁跃华 ^4, , 杨才福 ^5, , 张永权 ^6, , 马跃 ^7,

1.昆明理工大学冶金与能源工程学院,云南,昆明,650093;钢铁研究总院结构材料研究所,北京,100081

2.钢铁研究总院结构材料研究所,北京,100081

3.钢铁研究总院结构材料研究所,北京,100081

4.昆明理工大学冶金与能源工程学院,云南,昆明,650093

5.钢铁研究总院结构材料研究所,北京,100081

6.钢铁研究总院结构材料研究所,北京,100081

7.钢铁研究总院结构材料研究所,北京,100081

关键词：板条马氏体 , 板条贝氏体 , 强韧性 , EBSD , 裂纹扩展

Effect of substructure on strength and toughness of lath martensite-bainite microstructure in a 10 CrNi5MoV steel

采用光学显微镜、扫描电镜、透射电镜并利用背散射电子衍射(EBSD)的方法对低碳NiCrMoV钢经不同冷却方式获得的马氏体/贝氏体组织、亚结构进行了定量分析,研究其对强韧性的影响.结果表明:10CrNi5MoV钢原始奥氏体晶粒内的组织经不同比例马氏体、贝氏体混合后,强度变化不大,而韧性随板条柬和板条块尺寸的减小而提高,此时单个板条的宽度在0.38 μm左右.进一步研究表明,板条束界和板条块界对裂纹扩展具有相同的阻碍作用,且板条块宽度对冲击韧性的影响作用远远大于板条束.因此,本研究中的板条块可作为低碳马氏体钢对韧性起作用的组织控制亚单元,即板条块尺寸为控制韧性的"有效晶粒尺寸".

参考文献

[1]	姚忠凯.钢的组织转变[M].北京:机械工业出版社,1980
[2]	Maki T;Tsuzaki K;Tamura I .The morphology of microstructure composed of lath martensites in steels[J].Transactions of the Iron and Steel Institute of Japan,1980,20(04):207-214.
[3]	S. Morito;H. Tanaka;R. Konishi .The morphology and crystallography of lath martensite in Fe-C alloys[J].Acta materialia,2003(6):1789-1799.
[4]	Swarr T;Krauss G .The Effect of structure on the deformation of as-quenched and tempered martensite in an Fe-0.2pct C alloy[J].Metallurgical and Materials Transactions A:Physical Metallurgy and Materials Science,1976,76(01):41-48.
[5]	S. Morito;H. Yoshida;T. Maki .Effect of block size on the strength of lath martensite in low carbon steels[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2006(0):237-240.
[6]	Tomita Y;Okabayashi K .Effect of microstructure on strength and toughness of heat-treated low alloy structural steels[J].Metallurgical and Materials Transactions A:Physical Metallurgy and Materials Science,1986,176(07):1203-1209.
[7]	WANG Chunfang;WANG Maoqiu;SHI Jie et al.Effect of microstructure on the toughness of low alloy martensitic steel[J].Scripta Materialia,2008,58(06):492-495.
[8]	Inoue T;Matsuda S;Okamura Y et al.The fracture of a low carbon tempered martensite[J].Transactions of the Japan Institute of Metals,1970,11(01):36-43.
[9]	E. Bouyne;H. M. Flower;T. C. Lindley;A. Pineau .Use of EBSD technique to examine microstructure and cracking in a bainitic steel[J].Scripta materialia,1998(3):295-300.
[10]	R. Ayer;R. R. Mueller;T. Neeraj .Electron backscattered diffraction study of cleavage fracture in pure iron[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2006(1/2):243-248.
[11]	T. HANAMURA;F. YIN;K. NAGAI .Ductile-Brittle Transition Temperature of Ultrafine Ferrite/Cementite Microstructure in a Low Carbon Steel Controlled by Effective Grain Size[J].ISIJ International,2004(3):610-617.

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