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首页> 外文期刊>Journal of Manufacturing Processes >Study on metallurgical and mechanical aspects of GMA welded nitronic steel under the influence of weld quenching
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Study on metallurgical and mechanical aspects of GMA welded nitronic steel under the influence of weld quenching

机译：焊接淬火影响下GMA焊接氮钢冶金与机械方面的研究

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Nitronic steel (21-4-N) was solution annealed in as received (AR) condition at 950 degrees C and 1150 degrees C, followed by water quenching. Solution annealing at 1150 degrees C dissolves maximum carbides and minimum re-precipitation. The welding was performed with gas metal arc welding process using ER2209 filler wire. Microstructural and mechanical properties for different base and weld metal conditions were characterized using an optical microscope, FE-SEM, XRD. Dissolution of carbides after base metal solution annealing has resulted in enhanced tensile strength (998 MPa), ductility (12.73) and impact toughness (32 J). The properties of heat affected zone were dependent on the residual carbides. The ferrite content of weldmetal was found to be maximum at the weld center and decreased towards weld-HAZ interface. The precipitation of phases like Cr23 C6 and Cr7 C3 formed in base metal and weld-HAZ region caused the crack initiation, which leads to failure of specimens. The weld joint made with SA-2 was observed to possesses the best combination of mechanical properties with ultimate tensile strength (UTS) 960 MPa, ductility (%EL) 17.91 and impact strength (J) 91 with minimum residual carbides at weld-HAZ interface.
机译：在950℃和1150℃下将氮素钢（21-4-N）如接受（Ar）条件退火，然后进行水猝灭。在1150℃下退火溶解最大碳化物和最小重新沉淀。使用ER2209填充线使用气体金属电弧焊接工艺进行焊接。使用光学显微镜，Fe-SEM，XRD，表征不同碱和焊接金属条件的微观结构和机械性能。碱金属溶液退火后碳化物溶解导致增强的拉伸强度（998MPa），延性（12.73）和冲击韧性（32 j）。热影响区的性质取决于残留的碳化物。发现焊接中心的铁氧体含量在焊接中心最大值，并朝向焊接危机界面下降。在基础金属和焊缝区域中形成的Cr23 C6和Cr7 C3等相的沉淀导致裂纹引起，这导致样品的失效。用SA-2制成的焊接接头具有最佳的抗拉强度（UTS）960MPa，延展性（％EL）17.91和冲击强度（J）91在Weld-HAZ接口下具有最小残留碳化物的最佳机械性能组合。

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