| 摘要: |
| 利用摩擦焊对直径为13 mm的600 MPa级别的超细晶粒钢进行了焊接. 结果表明,严格控制摩擦焊工艺参数,超细晶粒钢具有良好的摩擦焊焊接性. 超细晶粒钢摩擦焊接头热影响区出现了轻微的晶粒长大,尺寸至9~11 μm. 接头性能分析表明,超细晶粒钢摩擦焊接头强度可达715 MPa,断面伸长率22%,断面收缩率68%,冲击韧性可达98 J,呈典型的韧性断裂. 急停试验表明,摩擦焊过程中变形区金属在摩擦扭矩和轴向压力大作用下,沿着轴向、切向、径向三个方向流动. 随摩擦时间的增加,不同区域的晶粒的尺寸都略有增加,其中以高温区增加最为明显. |
| 关键词: 超细晶粒钢 摩擦焊 接头组织 性能 |
| DOI： |
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| 基金项目:山东省科技发展计划资助项目(2014GGX103013);中央高校基本科研费业务资金专项资金资助项目(11CX04038A,13CX02069A) |
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| Microstructure and properties of joints of 600 MPa grade ultrafine grained steel obtained by friction welding |
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FENG Tao1, YU Zhenqi2, LIU Yonghua3, LI Si1, WANG Yinzhen1
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1.College of Mechanical & Electronic Engineering, China University of Petroleum, Qingdao 266580, China;2.China Petroleum Pipeline Bureau Domestic Division, Langfang 065000, China;3.Chinese Mechanical Engineering Society, Beijing 100048, China
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| Abstract: |
| 13mm diameter bars of 600MPa grade ultra-fine grain steel were welded by friction welding. Experimental results show that ultra-fine grain steel has good weldability of friction welding when the friction welding process parameters were properly controlled. Ultra-fine grain steel friction welding joint was mainly composed of four zones: welding seam, thermo-mechanically affected zone (TMAZ), heat affected zone(HAZ) and base material. The grain size was about 9-11 μm in the HAZ, which was slightly larger than the one of the base metal. Mechanical properties results showed that joint strength of the ultrafine-grained steel friction welding was up to 715 MPa with 22% elongation and 68% contraction ratio of cross section, and impact toughness was about 98 J. Meanwhile typical ductile fracture was obtained for this kind of joint. |
| Key words: 600 MPa grade ultrafine grained steel friction welding microstructure mechanical properties |
