摘要
研究了10Ni3CrMoV钢以衬垫半自动CO2气体保护焊打底,并以埋弧焊盖面的多道焊焊接接头各个区域显微组织以及力学性能的变化。对20mm厚的对接接头熔合区、母材区和热影响区进行V型缺口冲击试验和硬度测试。结果表明:焊接接头抗拉强度都高于母材,且弯曲试验结果都合格,满足塑性要求;热影响区的冲击功最低而硬度值最大,通过金相分析可知,该区的低冲击功和高硬度是由其铸造组织以及在晶界出现的第二相所导致的。
The multi-pass welded joint of 10Ni3CrMnV steel through semi-automatic CO2 gas shielded backing weld and submerged arc cover weld was investigated, focusing on the variation of microstrueture and mechanical pro- perties in various sub-zones. Instrumented Charpy V-notch tests and Viekers hardness experiments were conducted on the fusion zone, base metal and heat affected zone of the weld joint with 20 mm thickness. The results showed that the tensile strengths of the welded joints were higher than that of the base material, and flexural test results were qualified to meet the requirements of plasticity. The lowest impact energy and the highest hardness level were recorded in the fusion zone. Standard metallographic observation confirmed that the characteristic of the seam weld can be attributed to its cast microstructure and the second phases which present on the grain boundary.
出处
《材料导报》
EI
CAS
CSCD
北大核心
2015年第8期114-117,共4页
Materials Reports
基金
国家自然科学基金(51105240)
上海工程技术大学研究生创新试验项目(A-0903-13-01085)
关键词
10Ni3CrMoV钢
气体保护焊
埋弧焊
显微组织
力学性能
10Ni3CrMoV steel, gas protective welding, submerged arc welding, microstructure, mechanical property
