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首页> 外文会议>International Symposium on Designing, Processing and Properties of Advanced Engineering Materials(ISAEM 2003) pt.1; 20031105-20031108; Jeju Island; KR >Characteristics of CO_2 Laser Welded 800MPa Grade TRIP Steel
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Characteristics of CO_2 Laser Welded 800MPa Grade TRIP Steel

机译：CO_2激光焊接800MPa级TRIP钢的特性

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摘要

The effect of welding conditions on defects, microstructure, mechanical properties and formability of CO_2 laser welded 800MPa grade TRIP steel was investigated. Bead-on-plate welding was carried out under the various welding speed in 6kW with a shield gas of Helium. Extensive porosity was observed in the joints produced at a 4m/min of welding speed but was not observed in the joints when a welding speed greater than 6m/min was used. The maximum hardness was obtained at the weld metal and the HAZ near the weld metal and was the same regardless of the welding speed. The HAZ hardness near the base metal was reduced due to retained ferrite but was higher than that of the base metal. In a parallel tensile test to weld axis, the strength of the joints was higher than that of the base metal. Elongation was found to be lower than that of the raw material because a crack was initiated in the bead at the strength levels corresponding to the tensile strength of the base metal and was propagated perpendicular to tensile direction. The formability of joints was found to be 63% that of the raw material.
机译：研究了焊接条件对CO_2激光焊接800MPa级TRIP钢的缺陷，组织，力学性能和成形性的影响。使用氦气保护气体在6kW的各种焊接速度下进行板焊焊缝。在以4m / min的焊接速度生产的接头中观察到大孔隙，但是当使用大于6m / min的焊接速度时在接头中未观察到。在焊接金属和靠近焊接金属的HAZ处获得最大硬度，并且无论焊接速度如何，最大硬度都相同。由于保留了铁素体，降低了母材附近的HAZ硬度，但高于母材。在对焊接轴的平行拉伸测试中，接头的强度高于母材的强度。发现伸长率低于原材料的伸长率，这是因为以与母材的抗拉强度相对应的强度水平在胎圈中产生了裂纹并且该裂纹垂直于拉伸方向传播。发现接头的可成形性是原材料的可成形性的63％。

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