B950CF钢超窄间隙激光填丝焊接头疲劳性能

TG405; 超窄间隙激光填丝焊(ultra-narrow gap laser welding,Ultra-NGLW)是一种先进的厚贝氏体钢焊接技术,具有热输入小,焊接接头低应力、变形小等优点.通过对不同"激光填丝-激光打底"比例的Ultra-NGLW接头高频拉-拉疲劳试验,绘制了 10 mm厚不同填丝深度Ultra-NGLW接头S-N曲线,并通过对比分析接头的S-N曲线和疲劳断口特征,得到影响Ultra-NGLW 接头疲劳性能的主要原因.试验结果表明,随着激光填丝深度的加深,接头的疲劳性能逐渐降低,填丝深度为0 mm时,接头疲劳强度为337.5 MPa,当填丝深度达到5...

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Published in焊接学报 Vol. 45; no. 9; pp. 94 - 102
Main Authors 张成竹, 王东晔, 华程, 刘岳, 张骞, 朱振新
Format Journal Article
LanguageChinese
Published 航空工业成都飞机工业(集团)有限责任公司,成都,610031 01.09.2024
Subjects
fatigue strength
bainite high-strength steel
超窄间隙激光填丝焊
S-N curve
疲劳断口
S-N曲线
贝氏体高强钢
fatigue fracture
ultra-narrow gap laser welding
疲劳强度
Online AccessGet full text
ISSN0253-360X
DOI10.12073/j.hjxb.20230920001

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Abstract TG405; 超窄间隙激光填丝焊(ultra-narrow gap laser welding,Ultra-NGLW)是一种先进的厚贝氏体钢焊接技术,具有热输入小,焊接接头低应力、变形小等优点.通过对不同"激光填丝-激光打底"比例的Ultra-NGLW接头高频拉-拉疲劳试验,绘制了 10 mm厚不同填丝深度Ultra-NGLW接头S-N曲线,并通过对比分析接头的S-N曲线和疲劳断口特征,得到影响Ultra-NGLW 接头疲劳性能的主要原因.试验结果表明,随着激光填丝深度的加深,接头的疲劳性能逐渐降低,填丝深度为0 mm时,接头疲劳强度为337.5 MPa,当填丝深度达到5 mm后,疲劳强度趋于稳定在270 MPa左右,Ultra-NGLW接头的疲劳源主要为焊缝粗晶区和熔合区的气孔、夹杂等焊接缺陷,在高频拉-拉疲劳循环载荷的作用下,粗晶区马氏体脆硬组织中形成较多裂纹,使其疲劳源裂纹快速扩展并连通脆硬组织中的裂纹直至接头失效.
AbstractList TG405; 超窄间隙激光填丝焊(ultra-narrow gap laser welding,Ultra-NGLW)是一种先进的厚贝氏体钢焊接技术,具有热输入小,焊接接头低应力、变形小等优点.通过对不同"激光填丝-激光打底"比例的Ultra-NGLW接头高频拉-拉疲劳试验,绘制了 10 mm厚不同填丝深度Ultra-NGLW接头S-N曲线,并通过对比分析接头的S-N曲线和疲劳断口特征,得到影响Ultra-NGLW 接头疲劳性能的主要原因.试验结果表明,随着激光填丝深度的加深,接头的疲劳性能逐渐降低,填丝深度为0 mm时,接头疲劳强度为337.5 MPa,当填丝深度达到5 mm后,疲劳强度趋于稳定在270 MPa左右,Ultra-NGLW接头的疲劳源主要为焊缝粗晶区和熔合区的气孔、夹杂等焊接缺陷,在高频拉-拉疲劳循环载荷的作用下,粗晶区马氏体脆硬组织中形成较多裂纹,使其疲劳源裂纹快速扩展并连通脆硬组织中的裂纹直至接头失效.
Abstract_FL Ultra-NGLW is an advanced welding technology for thick bainitic steel,which has the advantages of low heat input,low stress and deformation of welded joints.By conducting high-frequency tensile fatigue tests on Ultra-NGLW joints with different"filling-bottoming"ratios,S-N curves of 10 mm thick Ultra-NGLW joints with different wire filling depths were plotted,and by comparing and analyzing the S-N curve and fatigue fracture characteristics,the main factors affecting the fatigue performance of Ultra-NGLW joints were identified.The experimental results indicate that as the depth of laser wire filling increases,the fatigue performance of the joint gradually decreases.When the filling depth is 0 mm,the fatigue strength of the joint is 337.5 MPa,while the filling depth reaches 5 mm,the fatigue strength tends to stabilize at around 270 MPa.The fatigue source of Ultra-NGLW joints is mainly welding defects such as pores and inclusions in the coarse-grained and fusion zones of the weld.Under the action of high-frequency tensile fatigue cyclic loads,more cracks are formed in the martensitic brittle hard structure in the coarse-grained zone,causing the fatigue source cracks to rapidly expand and connect the cracks in the brittle hard structure until the joint fails.
Author 张成竹
王东晔
刘岳
张骞
朱振新
华程
AuthorAffiliation 航空工业成都飞机工业(集团)有限责任公司,成都,610031
AuthorAffiliation_xml – name: 航空工业成都飞机工业(集团)有限责任公司,成都,610031
Author_FL LIU Yue
WANG Dongye
HUA Cheng
ZHU Zhenxin
ZHANG Chengzhu
ZHANG Qian
Author_FL_xml – sequence: 1
  fullname: ZHANG Chengzhu
– sequence: 2
  fullname: WANG Dongye
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  fullname: HUA Cheng
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  fullname: LIU Yue
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  fullname: ZHANG Qian
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  fullname: ZHU Zhenxin
Author_xml – sequence: 1
  fullname: 张成竹
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  fullname: 王东晔
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DocumentTitle_FL Fatigue properties of B950CF steel ultra-narrow gap laser wire filler welding joint
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Keywords fatigue strength
bainite high-strength steel
超窄间隙激光填丝焊
S-N curve
疲劳断口
S-N曲线
贝氏体高强钢
fatigue fracture
ultra-narrow gap laser welding
疲劳强度
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PublicationTitle 焊接学报
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Snippet TG405; 超窄间隙激光填丝焊(ultra-narrow gap laser welding,Ultra-NGLW)是一种先进的厚贝氏体钢焊接技术,具有热输入小,焊接接头低应力、变形小等优点.通过对不同"激光填丝-激光打底"比例的Ultra-NGLW接头高频拉-拉疲劳试验,绘制了 10...
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Title B950CF钢超窄间隙激光填丝焊接头疲劳性能
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