LNG铝制板翅式结构的常/低温断裂机理研究

兰州理工大学学报 ›› 2024, Vol. 50 ›› Issue (5): 71-76.

LNG铝制板翅式结构的常/低温断裂机理研究

段克润¹, 王圣寻², 麻宏强^*2

1.山西工程科技职业大学设备工程学院, 山西晋中 030619;
2.华东交通大学土木建筑学院, 江西南昌 330013

收稿日期:2023-05-05 出版日期:2024-10-28 发布日期:2024-10-31
通讯作者: 麻宏强(1984-),男,江西南昌人,博士,副教授.Email:mahq2014@sina.com
基金资助:
国家自然科学基金(51808275)

The fracture mechanism of aluminum plate-fin structures in liquefied natural gas field at room/low temperature

DUAN Ke-run¹, WANG Sheng-xun², MA Hong-qiang²

1. School of Equipment Engineering, Shanxi Vocational University of Engineering Science and Technology, Jinzhong 030619, China;
2. School of Civil Engineering and Architecture, East China Jiaotong University, Nanchang 330013, China

Received:2023-05-05 Online:2024-10-28 Published:2024-10-31

摘要/Abstract

摘要： 为避免LNG铝制板翅式换热器的强度破坏并提高其使用寿命,基于轴向拉伸试验与扫描电子显微镜观测方法,研究了其铝制板翅式结构在常/低温下的拉伸断裂机理.结果表明,相比常温,低温下板翅试样的屈服极限增大了42.6%,抗拉强度增大了48.9%,破坏时的应变增大了27.8%.常/低温下板翅试样的断裂趋势主要为翅片根部中心朝钎焊区发展断裂以及钎焊区朝翅片根部发展断裂;断裂整体以解理断面及韧窝等形貌为主,但低温下翅片的解理断面密集程度更高,韧窝等塑性形貌更少.板翅试样常温下的断裂位置主要位于钎焊区,低温下的断裂位置仅位于钎焊区.因此,为避免铝制板翅式结构在钎焊区处发生断裂,可采取改善铝制板翅式结构的钎焊工艺以及增加钎焊区焊料等方式.

关键词: 铝制板翅式换热器, 拉伸试验, 断裂方式, 形貌特征, 低温, 断裂机理

Abstract: To avoid strength damage and improve the service life of LNG aluminumplate-fin heat exchangers, the tensile fracture mechanism of their aluminum plate-fin structures atroom/low temperature is studied using axial tensile testing and scanning electron microscope observation. The result shows that, compared to mechanical properties at room temperature, the yield limit of plate-fin specimens atlow temperature increases by 42.6%, the tensile strength increases by 48.9%, and the strain increases by 27.8% during failure. The fracture trend of plate-fin specimens at room/low temperature conditions primarily involved crack propagation from the fin root and vice versa. The overall fracture morphology of cleavage sections and dimples account for a large area of fracture surface. However, the morphology of cleavage sections is observed with high distribution at low temperature, and the plastic morphology accounts for a small area of fracture surface. The fracture of plate-fin specimen at room temperature is mainly located in the brazing zone, whereas the fracture at low temperature is confined to the brazing zone. Therefore, the fracture of the aluminum plate-fin structure in the brazing zone can be avoided by improving the brazing process of the aluminum plate-fin structure and increasing the solder in the brazing zone.

Key words: aluminum plate-fin heat exchanger, tensile test, fracture mode, morphological characteristics, low temperature, fracture mechanism

中图分类号:

TE88

段克润, 王圣寻, 麻宏强. LNG铝制板翅式结构的常/低温断裂机理研究[J]. 兰州理工大学学报, 2024, 50(5): 71-76.

DUAN Ke-run, WANG Sheng-xun, MA Hong-qiang. The fracture mechanism of aluminum plate-fin structures in liquefied natural gas field at room/low temperature[J]. Journal of Lanzhou University of Technology, 2024, 50(5): 71-76.

参考文献

[1] ZHANG B,FAN G,YANG J,et al.Numerical analysis of header structure improvement in a plate-fin heat exchanger[J].Chemical Engineering & Technology,2016,39(10):1813-1820.
[2] 蒋庆峰,潘崇耀,陈育平,等.铝制错列锯齿型板翅式换热器内低温氦气流动传热特性研究[J].江苏科技大学学报(自然科学版),2022,36(4):33-39.
[3] 麻宏强,贺斌贤,刘叶敏,等.钎焊接头对铝制板翅结构热应力影响规律[J].哈尔滨工业大学学报,2019,51(2):172-178.
[4] 任红艳.试析铝制板翅式换热器导流结构的优化设计[J].中国设备工程,2019(9):92-93.
[5] 于思捷.铝制板翅式换热器钎焊工艺性研究[J].中国化工装备,2019,21(1):35-37.
[6] KOLLURI M,PIERICK P T,BAKKER T.Characterization of high temperature tensile andcreep-fatigue properties of Alloy 800H for intermediate heat exchanger components of (V)HTRs[J].Nuclear Engineering and Design,2015,284:38-49.
[7] PENG X,LI D,LI J,et al.Improvement of flow distribution by new inlet header configuration with splitter plates for plate-fin heat exchanger[J].Energies,2020,13:1323.
[8] WANG W,GUO J,ZHANG S,et al.Numerical study on hydrodynamic characteristics of plate-fin heat exchanger using porous media approach[J].Computers & Chemical Engineering,2014,61:30-37.
[9] 陈少伟,李德新,张晓明.基于热-应力耦合场有限元分析的不锈钢板翅结构性能研究[J].现代制造技术与装备,2020(1):55+58.
[10] 蒋文春,巩建鸣,陈虎,等.钎缝厚度对不锈钢板翅结构蠕变的影响[J].焊接学报,2008(8):9-12+113.
[11] 巩建鸣,蒋文春.钎料厚度对不锈钢板翅结构抗拉强度影响的有限元分析与试验研究[J].真空科学与技术学报,2010,30(5):561-566.
[12] 文键,李亚梅,王少华,等.板翅式换热器板翅结构强度影响因素分析[J].低温工程,2013(2):52-59.
[13] WANG J,LING X,ZHANG W,et al.Microstructures and mechanical properties of friction stir welded butt joints of 3003-H112 aluminum alloy to 304 stainless steel used in plate-fin heat exchanger[J].Journal of Materials Research and Technology,2022,21:3086-3097.
[14] 蒋文春,巩建鸣,涂善东.保温时间对304不锈钢板翅结构真空钎焊的影响[J].机械设计与制造,2010(11):79-81.
[15] HWANG J H,SONG G D,KIM D W,et al.Tensile and fatigue properties of Super 304H welded joint at elevated temperatures[J].International Journal of Fatigue,2021,143:105989.
[16] JIANG W,GONG J,TU S T.A new cooling method for vacuum brazing of a stainless steelplate-fin structure[J].Materials & Design,2010,31(1):648-653.
[17] ATTAR M R,MOHAMMADI M,TAHERI A,et al.Heat transfer enhancement of conventional aluminum heat sinks with an innovative,cost-effective,and simple chemical roughening method[J].Thermal Science and Engineering Progress,2020,20:100742.
[18] JIANG Q,PAN C,CHEN Y,et al.Improved heat transfer and friction correlations of aluminum offset-strip fin heat exchangers for helium cryogenic applications[J].Applied Thermal Engineering,2021,192(1):116892.
[19] MA H Q,WANG S X,XIE Y,et al.The relationship between stress of plate-fin structures and emergency stop operation process in LNG heat exchanger[J].Oil & Gas Science and Technology-Revue d’IFP Energies Nouvelles,2021,76:77.
[20] 倪利刚.铝制板翅式换热器热工性能的试验研究[J].化工时刊,2011,25(6):14-17.
[21] 韦小雄,张淑文,唐萍,等.铝制板翅式换热器导流结构优化设计[J].化工设备与管道,2011,48(1):13-16.
[22] 张小松,赵开涛,李舒宏.铝制板翅式换热器的传热与阻力特性的试验研究[J].低温工程,1999(3):40-45.
[23] 徐兴军,徐小勤.酸碱清洗在铝制板翅式换热器制造中的应用[J].清洗世界,2020,36(3):9-10.
[24] 季春锋.氧含量对铝制板翅式散热器真空钎焊的影响[J].科技创新导报,2018,15(5):124-125.
[25] 倪利刚,刘孝根,程沛.铝制板翅式换热器空气侧传热特性研究[J].石油和化工设备,2012,15(9):5-7.
[26] HU H,LI J.Experimental investigation on heat transfer characteristics of two-phase flow boiling in offset strip fin channels of plate-fin heat exchangers[J].Applied Thermal Engineering,2021,185:116404.
[27] 周劲,张戬.4004/3003/4004铝合金复合钎焊板包覆率研究[J].铝加工,2020(2):20-24.
[28] 宾月景,刘莹,曾勇谋,等.冷轧复合工艺对4004/3003/4004铝合金复合带组织和性能的影响[J].广西科学,2022,29(4):809-816.
[29] 宾月景,刘莹,曹宇,等.中间退火温度对新能源汽车用4004/3003/4004铝合金复合板组织和性能的影响[J].金属热处理,2022,47(10):203-207.
[30] CHOU C C,CHEN G W.Lateral cyclic testing and backbone curve development of high-strength steel built-up box columns under axial compression[J].Engineering Structures,2020,223:111147.
[31] LI B,WANG Y,ZHI X,et al.Testing,modelling and design of 7A04-T6 high-strength aluminium alloy RHS columns under axial compression[J].Journal of Building Engineering,2022,57:104910.
[32] MA H,LU K,LIU X.Experimental and numerical studies on lateral low-velocity impact behaviour and residual axial strength of circular aluminum alloy (6061-T6) tubes[J].Structures,2023,47:1250-1264.