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基于焊接的多道单层再制造熔覆层组织及性能
赵慧慧1, 张广军1, 范庆2, 上官芸娟1, 吴林1
1.哈尔滨工业大学金属精密热加工国家重点实验室, 哈尔滨 150001;2.大庆装备制造集团力神泵业公司, 黑龙江 大庆 163000
摘要:
以基于焊接的多道单层再制造熔覆层为研究对象,研究了其横截面宏观、微观组织形貌,重点分析中间道熔覆金属微观组织特点,并对熔覆层横截面整体显微硬度和道间显微硬度进行测试,对熔覆层进行不同方向拉伸试验.结果表明,多道单层再制造熔覆层除最后一道外,每道都可分为重熔区、半熔化区、完全重结晶区及不完全重结晶区;熔覆层整体硬度两侧高于中间,且沿堆积方向能够承受比垂直堆积方向更大的拉伸载荷,拉伸断裂均为延性断裂.
关键词:  基于焊接的再制造  多道单层熔覆层  组织性能  显微硬度
DOI:
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基金项目:国家自然科学基金资助项目(50371059)
Microstructure and performances of multi-pass single-layer weld-based remanufacturing component
ZHAO Huihui1, ZHANG Guangjun1, FAN Qing2, SHANGGUAN Yunjuan1, WU Lin1
1.State Key Laboratory of Advanced Welding Production Technology, Harbin Institute of Technology, Harbin 150001, China;2.Lishen Pump Company Machining Plant, Daqing Equipment Manufacturing Business, Daqing 163000, China
Abstract:
The micrographs of cross-section of multi-pass single-layer weld-based remanufacturing component are analyzed,especially the microstructure of filler pass in middle position.The microhardness of multi-pass single-layer remanufacturing component at the whole cross-section and the inter-pass position is tested,and tensile testes in different directions are carried out.Research results show that every pass of cladding except for the last pass contains the remelting region,half melting region,complete phase transformation region and segmental phase transformation region.On the across section,the micro hardness of remanufacturing cladding at two sides is larger than that in the middle position.The allowed tensile loads of test piece along depositing direction are larger than those along vertical depositing direction,and the fracture types of tensile pieces at two situations are both plastic fracture.
Key words:  weld-based remanufacturing  multi-pass single-layer cladding  microstructure and performances  microhardness