10CrSiNiCu船用高强钢光纤激光焊接接头组织和性能

发布时间：2018-05-28 04:37

本文选题：激光技术 + CrSiNiCu钢　；参考：《中国激光》2016年03期

【摘要】：为了促进船用高强钢结构激光焊接技术发展,利用光纤激光对8 mm厚的10CrSiNiCu钢板进行了填丝对接焊接。分析了焊接接头的微观组织形貌与硬度、拉伸、弯曲和冲击等力学性能,研究了焊接热输入对接头组织与性能的影响。结果表明,10CrSiNiCu钢激光焊焊缝区组织主要为马氏体+铁素体+贝氏体;热影响区粗晶区组织主要为块状铁素体+粒状贝氏体+马氏体。焊接接头硬度分布不均匀,焊缝区硬度最高,热影响区次之。当焊接线能量从5.00 k J/cm降至3.64 k J/cm时焊缝区硬度从346 HV增加至396 HV。接头拉伸试样均断裂在母材。3倍板厚压头作用下焊接试样可正向弯曲约113°,比母材降低近60°。熔合线和焊缝区的低温(-40℃)冲击功随着焊接热输入的增加而先增加后减小,在E=4.20 k J/cm时熔合线和焊缝区的冲击功最高,分别达到95 J和101 J,冲击试样断口均呈韧性断裂特征。
[Abstract]:In order to promote the development of laser welding technology for marine high strength steel structure, the 8 mm thick 10CrSiNiCu steel plate was welded with filler wire by fiber laser. The microstructure, hardness, tensile, bending and impact mechanical properties of welded joints were analyzed, and the effects of welding heat input on the microstructure and properties of welded joints were studied. The results show that the microstructure of laser welding weld zone of 10CrSiNiCu steel is mainly martensite ferrite bainite and the coarse grain zone of heat affected zone is mainly block ferrite granular bainite martensite. The hardness distribution of welded joints is not uniform, the hardness of weld zone is the highest, and the heat affected zone is the second. The weld zone hardness increased from 346HV to 396HV when the welding line energy decreased from 5.00k J/cm to 3.64k J/cm. The tensile specimens of the joints are fractured under the action of the thickness of the base metal. 3 times the thickness of the plate, the welding specimens can bend forward about 113 掳, which is about 60 掳lower than the base metal. The impact energy of fusion line and weld zone increases first and then decreases with the increase of welding heat input. The impact energy of fusion line and weld zone reaches 95 J and 101 J, respectively, and the impact energy of fusion line and weld zone reaches 95 J and 101 J, respectively. The fracture surface of the impact specimen is characterized by ductile fracture.
【作者单位】：上海交通大学上海市激光制造与材料改性重点实验室;沪东中华造船(集团)有限公司;
【基金】：国防基础科研计划(A0720132003)
【分类号】：TG456.7

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