| 摘要: |
| 针对500~600 MPa低合金高强度钢的韧化问题,研究了夹杂物对Ti-B微合金化焊缝金属针状铁素体形成的影响。钢中的非金属夹杂物,对促进晶内针状铁素体的形成,提高焊缝金属韧性有显著的作用。通过电镜分析,探讨了夹杂物的类型、成分对针状铁素体形成的作用。结果表明,Ti、Mn、Al、Si的复合氧化物夹杂可有效地促进针状铁素体形核,而MnO·SiO2夹杂和MnS夹杂对针状铁素体形核作用不大。夹杂物对针状铁素体形核的主要用是,在夹杂物周围能形成一个塑性畸变区,这个由夹杂物与母相热膨胀系数差引起的塑性区,对针状铁素体的形成有一定作用。 |
| 关键词: 针状铁素体 夹杂物 形核 焊缝金属 热膨胀系数 |
| DOI： |
| 分类号: |
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| Mechanism on toughness improvement of Ti-B containing weld metal |
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SUI Shao-hua1, CAI Wei-wei2, SONG Tian-ge1, ZHANG An3
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1.Department of Materials Science and Engineering, Harbin Institute of Technology, Weihai 264209, Shandong, China;2.Inspection Institute of Boiler Pressure Container at Weihai, Weihai 264209, Shandong, China;3.Anshan Iron and Steel Company, Anshan 114002, Niaoning, China
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| Abstract: |
| The acicular ferrite formation mechanism in 500-600 MPa high-strength low-alloy steel weld metal was investigated. The role of inclusions on the nucleation of acicular ferrite in Ti-B containing weld metal was discussed. The influence of inclusions compositions and types on the nucleation of acicular ferrite is studied by electron microscope techniques and X-ray energy dispersive analysis. The results suggest that Ti, Mn, Al, Si oxides provide active nucleation sites for acicular ferrite,but MnS and MnO·SiO2 are not a effective for fine acicular ferrite nucleation. The scanning electron micrographs show that there is a shadow zone surrounded the inclusion. It is a plastic zone of matrix. It seems to be more effective for the formation of acicular ferrite. |
| Key words: acicular ferrite inclusion nucleation weld metal thermal expansion coefficient |
