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Microstructure and corrosion behavior of the heat affected zone of a stainless steel 308L-316L weld joint

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Journal of Materials Science & Technology 2018年第10期34卷 1823-1834页

作者： Cheng Ma Qunjia Peng Jinna Mei En-Hou Han Wei Ke Key Laboratory of Nuclear Materials and Safety Assessment. Institute of Metal Research Chinese Academy of Science Shenyang 110016 China University of Chinese Academy of Sciences Beifing 100049 China Suzhou Nuclear Power Research Institute Suzhou 215004 China

Microstructure of the heat affected zone （HAZ） of a 308L-316L stainless steel （SS） weld joint and its corrosion behavior in high temperature water were studied. Peak of the residual strain was observed to approach to the fusion boundary in the HAZ while the strain increased from the top to root areas of the HAZ. The root area of the HAZ shows a lower corrosion resistance in high temperature water than the top and middle areas of the HAZ. This is attributed to a higher level of residual strain in association with a higher density of tangled dislocations in the top area of the HAZ. The results suggest that the residual strain in the HAZ could also promote the SCC through its effect on corrosion, in addition to that on the local microstructure and mechanical property of the steel.

关键词： Stainless steel HAZ weld joint Corrosion High temperature water

Fatigue Crack Growth Behavior of Different Zones in an Annealed Automatic Gas Tungsten Arc weld joint of TA16 and TC4 Titanium Alloys

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Journal of Wuhan University of Technology(Materials Science) 2020年第6期35卷 1090-1097页

作者： SHAO Ling WU Sujun PENG Wenya DATYE Amit JU Hongbo LIU Ying Research Institute of Zhejiang University-Taizhou Zhejiang UniversityTaizhou 318000China School of Materials Science and Engineering Beihang UniversityBeijing 100191China AECC Hunan Aviation Powerplant Research Institute Zhuzhou 412000China Department of Mechanical Engineering&Materials Science Yale UniversityNew HavenCT 06511USA Key Laboratory of Advanced welding Technology of Jiangsu Province Jiangsu University of Science and TechnologyZhenjiang 212003China Institute of Technology of Aircraft Engine Beijing Research Institute of Aviation EngineeringBeijing 100024China

Based on the investigated microstructure of different zones in the annealed automatic gas tungsten arc weld joint of TA16 and TC4 titanium alloys,the mechanical property of them was assessed under fatigue crack growth rate *** evaluation of fatigue crack growth rate,three points bending specimens were *** correlation between the range of stress intensity factor and crack growth rate was determined in different zones of the annealed weld *** crack growth rates were obviously different in different zones of weld joint of dissimilar titanium alloys,due to their different *** electron microscope examinations were conducted on the fracture surface in order to determine the relevant fracture mechanisms and crack growth mechanisms with respect to the details of microstructure.

关键词： dissimilar titanium alloys joining weld joint microstructure fatigue crack growth rate fracture

Microstructure and mechanical properties of Al-Mg-Mn-Zr-Er weld joints filled with Al-Mg-Mn-Zr and Al-Mg-Mn-Zr-Er weld wires

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Journal of Rare Earths 2010年第4期28卷 627-630页

作者：韦小园黄晖陈子勇王为李聪颖聂祚仁 College of Materials Science and Engineering Beijing University of Technology

The Al-Mg-Mn-Zr-Er alloy sheets with a thickness of 4 mm were welded by TIG welding, the microstructures and mechanical properties of Al-Mg-Mn-Zr-Er alloy weld joints filled with Φ1.6 mm Al-Mg-Mn-Zr and Al-Mg-Mn-Zr-Er welding wires were studied by optical microscopy, scanning electron microscopy, transmission electron microscopy, hardness testing and tensile mechanical properties testing. The result showed that, the tensile strength increased by 57 MPa and the coefficient of weld joint reached 0.8 when Al-Mg-Mn-Zr-Er welding wire was used as filling material. The tensile strength and elongation of weld joint filled with Al-Mg-Mn-Zr-Er welding wire were 19% and 85% higher those that of filled with Al-Mg-Mn-Zr welding wire respectively, which resulted from grain refinement strengthening and dispersion strengthening of Al3Er.

关键词： Al-Mg-Mn-Zr-Er welding wire weld joint microstructure and mechanical properties dispersion strengthening rare earths

Residual stress relaxation in typical weld joints and its effect on fatigue and crack growth

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Acta Metallurgica Sinica(English Letters) 2009年第3期22卷 202-210页

作者： Liangbi LI Zhengquan WAN Zili WANG Chunyan JI School of Naval Architecture and Ocean Engineering Jiangsu University of Science and Technology Zhenjiang 212003 China China Ship Scientific Research Center Wuxi 214082 China

Many factors influence the fatigue and crack growth behavior of welded joints. Some structures often undergo fairly large static loading before they enter service or variable amplitude cyclic loading when they are in service. The combined effect of both applied stress and high initial residual stress is expected to cause the residual stresses relaxation. Only a few papers seem to deal with appropriate procedures for fatigue analysis and crack growth by considering the combined effect of variable amplitude cyclic loading with residual stresses relaxation. In this article, some typical welded connections in ship-shaped structures are investigated with 3-D elastic-plastic finite element analysis. The effect of residual stress relaxation, initial residual stress, and the applied load after variable amplitude cyclic loading is revealed, and a formula for predicting the residual stress at hot spot quantitatively is proposed. Based on the formula, an improved fatigue procedure is introduced. Moreover, crack growth of typical weld joints considering residual stresses relaxation is studied.

关键词： Residual stress relaxation weld joint Finite element Fatigue crack growth

Microstructure Characterization of High-heat-input welding joint of HSLA Steel Plate for Oil Storage Construction

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Journal of Materials Science & Technology 2009年第6期25卷 857-860页

作者： Weihua Sun Guodong Wang Jiming Zhang Dianxiu Xia Hao Sun State Key Laboratory of Rolling and Automation Northeastern University Shenyang 110004 China R & D Center Jinan Iron and Steel Group Co. Ltd. Jinan 250101 China

In this paper, microstructure and mechanical properties of welding metals in 610 MPa high strength low alloy （HSLA） were studied after high-heat-input welding. Both the base material and the weld joint proved excellent strength and toughness by vibratory electrogas arc （VEGA） welding under 90 to 100 kJ/cm heatinput. The heat-affected zone （HAZ） was comprised of fine-grain zone （FGZ） and coarse-grain zone （CGZ）, which characterizes fine granular structure and lathing-bainite substructure, It has found that large quantity of dispersed TiN and M23E6 precipitates restrain structure growing in HAZ and strengthen the weldment together with dislocations in the welded joint.

关键词： weld joint Microstructure Precipitates High-heat-input welding Vibratory electrogas arc welding On-line accelerated cooling Off-llne tempering

Effect of nano TiN/Ti refiner on as-cast and hot-working microstructure of commercial purity aluminum

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Transactions of Nonferrous Metals Society of China 2013年第7期23卷 1890-1897页

作者：蔡思祺李玉洁谌援李欣蔚薛丽红华中科技大学机械科学与工程学院武汉430074 华中科技大学材料科学与工程学院武汉430074

A novel type nano TiN/Ti composite grain refiner （TiN/Ti refiner） was prepared by high energy ball milling, and its effect on as-cast and hot-working microstructure of commercial purity aluminum （pure Al） was investigated. The results show that TiN/Ti refiner exhibits excellent grain refining performances on pure Al. With an addition of 0.2% TiN/Ti refiner, the average grain size of pure Al decreases to 82 μm, which is smaller than that of pure Ti and Al 5Ti 1B master alloy as refiners. The microstructure of weld joint of pure Al with 0.1% TiN/Ti refiner is fine equiaxed grains and the hardness of weld joint is higher than that of the base metal. For pure Al with 40% cold deformation and recrystallization at 250 °C for 1.0 h, the grains of the sample added 0.1% Ti powder have an obvious grain growth behavior. In contrast, oriented grains caused by deformation have been eliminated, and there is no obvious grain growth in pure Al refined with 0.1% TiN/Ti refiner, indicating that nano TiN in the refiner inhibits the growth of grain during recrystallization.

关键词： nano TiN/Ti composite grain refiner commercial purity aluminum grain refinement weld joint deformation and recrystallization

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RAM系列加工中心

航空制造技术 1995年第2期 40-40页

作者：朱文伯

ＲＡＭ系列加工中心ＲＡＭ系列加工中心是吉丁斯·路易斯（Ｇ＆Ｌ）公司近年新研制成功并投入批量生产的高水平、高质量、高性能价格比且具有极强竞争力的小型加工中心。ＲＡＭ系列加工中心有ＲＡＭ５００与ＲＡＭ６３０两种规格（即托... 详细信息

ＲＡＭ系列加工中心ＲＡＭ系列加工中心是吉丁斯·路易斯（Ｇ＆Ｌ）公司近年新研制成功并投入批量生产的高水平、高质量、高性能价格比且具有极强竞争力的小型加工中心。ＲＡＭ系列加工中心有ＲＡＭ５００与ＲＡＭ６３０两种规格（即托盘尺寸为５００ｍｍ与６３０ｍｍ）。...

关键词： 316 Ti austenitic stainless steel weld joint sodium corrosion δferrite

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