用CO2连续激光焊接器,以不同焊速焊接Fe-Mn-C系TWIP钢试样.使用OM,SEM观察焊接试样的形貌组织在焊缝区,热影响区,以及基体的变化,并结合XRD检测观察:发现原伴有少许退火孪晶的室温单相奥氏体经单相拉伸变形后有少量γ→ε和γ→ε→α协同大量变形孪晶共存于焊后拉伸试样中,即焊后高锰TWIP钢变形时同时发生TRIP效应和TWIP效应.此外,通过背散射电子衍射技术(EBSD)探讨激光焊接后,不同焊速下焊缝区,热影响区和母材的晶粒取向差与晶界特征变化.结果表明本试验中,激光焊接参数为2.5 kW,2.5 m/min下的试样组织性能最优,对焊钢板可达到32％的延伸率,534 MPa的屈服强度和1 100 MPa的抗拉强度.
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