| 960MPa级熔敷金属组织及冲击韧性分析 |
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| 引用本文： | 吴炳智,荆文,徐玉君,孙静涛,王旭友.960MPa级熔敷金属组织及冲击韧性分析[J].焊接学报,2015,36(6):77-80. |
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| 作者姓名： | 吴炳智 荆文 徐玉君 孙静涛 王旭友 |
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| 作者单位： | 1.哈尔滨工业大学 先进焊接与连接国家重点实验室, 哈尔滨 150001;机械科学研究院 哈尔滨焊接研究所, 哈尔滨 150028 |
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| 基金项目： | 高档数控机床与基础制造装备科技重大专项资助项目(2011ZX04016-061) |
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| 摘 要： | 研制开发了960 MPa级高强韧性气体保护焊丝,利用金相显微镜(OM)、扫描电子显微镜(SEM)、透射电子显微镜(TEM),并通过低温示波冲击等试验研究了熔敷金属微观组织和冲击韧性. 结果表明,熔敷金属金相组织为粒状贝氏体(GB)+低碳马氏体(M),马氏体的出现可能和合金元素的成分偏析有关. 贝氏体铁素体(BF)板条晶界形核并向晶内生长,BF片条间有呈薄膜状分布的残余奥氏体(γ'),对韧性有利. 该贝氏体-马氏体型混合组织冲击韧性较好,热输入为13.7 kJ/cm时,熔敷金属裂纹扩展功和冲击吸收总功分别为63和75 J.
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| 关 键 词： | 高强度钢 熔敷金属 组织 冲击韧性 |
| 收稿时间： | 2013/12/6 0:00:00 |
Analysis on microstructure and impact absorbed energy of 960 MPa deposited metal |
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| WU Bingzhi,JING Wen,XU Yujun,SUN Jingtao and WANG Xuyou.Analysis on microstructure and impact absorbed energy of 960 MPa deposited metal[J].Transactions of The China Welding Institution,2015,36(6):77-80. |
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| Authors: | WU Bingzhi JING Wen XU Yujun SUN Jingtao and WANG Xuyou |
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| Affiliation: | 1.State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, China;Harbin Welding Institute, China Academy of Machinery Science & Technology, Harbin 150028, China2.Harbin Welding Institute, China Academy of Machinery Science & Technology, Harbin 150028, China |
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| Abstract: | The solid wire of high strength and toughness was successfully developed. The microstructure and impact absorbed energy of deposited metal were analyzed in detail by means of optical microscopy (OM), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and instrumented impact test. Results showed that the microstructure was the mixture of granular bainite and low carbon martensite, while the formation of martensite was probably attributed to composition segregation. The bainite ferrite nucleated on grain boundary and then intragranular growth occurs. The existence of the film-like residual austenite was found between the lath-like bainite ferrites, and its appearance was beneficial to toughness. It was evident that the microstructure of bainite-martenite acquired an excellent toughness. Meanwhile, with the heat input of 13.7 kJ/cm, the crack propagation energy was about 63 J and the total impact absorbed energy was about 75 J. |
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| Keywords: | high strength steel deposited metal microstructure impact toughness |
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