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In combination with experiments and multi-step finite element simulation, the residual stress distribution in components manufactured by laser powder bed fusion (LPBF) and the influence of the initial residual stress field on the laser shock peening (LSP)-induced compressive residual stress field. The validity of the simulation results was verified by the residual stress values measured with X-ray diffraction. The results show that the thermal stress of the lower and middle layer materials in the component fabricated by LPBF undergoes a transition from zero stress, compressive stress, tensile stress to compressive stress, while the top layer material shows a transition from zero stress, compressive stress to tensile stress, thus leading to tensile residual stress occurred on the surface layer of LPBF fabricated component, while compressive residual stress in the lower part. The action of initial residual stress field results in the reduced peak value but increased depth of LSP-induced compressive residual stress. The initial residual tensile stress field of LPBF components can exert a suppressive and dragging effect on the reverse plastic deformation caused by surface waves, leading to reduced intensity and changed position of the “residual stress hole”, which can improve the uniformity of LSP-induced residual stress distribution.
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结合实验与多步骤有限元仿真,分析了激光粉末床熔融(LPBF)构件中残余应力分布规律以及该初始残余应力场对激光冲击强化(LSP)诱生残余压应力场的影响,并通过X射线测量的残余应力值验证了仿真结果的有效性。结果表明,LPBF加工时零件中下层材料热应力呈现“零应力-压应力-拉应力-压应力”的转变规律,顶层材料则呈现“零应力-压应力-拉应力”的转变规律,进而导致LPBF构件表层残余应力场为拉伸态,下方为压缩态。在初始残余应力场作用下,LSP引入的峰值残余压应力会降低,但残余压应力深度会增加。LPBF构件初始残余拉应力场会对表面波产生的反向塑性变形产生抑制和拖拽作用,进而降低“残余应力洞”强度并改变其位置,提高LSP诱生残余应力分布均匀性。
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邓洋洋(2000—),男,湖南邵阳人,硕士研究生,主要研究方向为材料动态行为。E-mail:huijiadyy@163.com
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邓洋洋(2000—),男,湖南邵阳人,硕士研究生,主要研究方向为材料动态行为。E-mail:huijiadyy@163.com
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26(11): 300-304., articleTitle=Formation mechanism of “residual stress hole” strengthened by laser shock, refAbstract=null)], funds=[Fund(id=1241064317563490941, tenantId=1146029695717560320, journalId=1235980550691926019, articleId=1241064283711263338, awardId=51871243, language=CN, fundingSource=国家自然科学基金(51871243), fundOrder=null, country=null)], companyList=[AuthorCompany(id=1241064302866649515, tenantId=1146029695717560320, journalId=1235980550691926019, articleId=1241064283711263338, xref=null, ext=[AuthorCompanyExt(id=1241064302875038125, tenantId=1146029695717560320, journalId=1235980550691926019, articleId=1241064283711263338, companyId=1241064302866649515, language=EN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=School of Materials Science and Engineering, Central South University, Changsha 410083, Hunan, China), AuthorCompanyExt(id=1241064302879232430, tenantId=1146029695717560320, journalId=1235980550691926019, articleId=1241064283711263338, companyId=1241064302866649515, language=CN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=中南大学 材料科学与工程学院,湖南 长沙 410083)])], figs=[ArticleFig(id=1241064309707559464, tenantId=1146029695717560320, journalId=1235980550691926019, articleId=1241064283711263338, language=EN, label=Fig.1, caption=
Laser light path in processing, figureFileSmall=8Dgk0a/1GeDWsUGT04ubsw==, figureFileBig=4Idyp+2/CbRXjMKUs0y5bA==, tableContent=null), ArticleFig(id=1241064311318172204, tenantId=1146029695717560320, journalId=1235980550691926019, articleId=1241064283711263338, language=CN, label=图1, caption=
激光加工光斑移动路径, figureFileSmall=8Dgk0a/1GeDWsUGT04ubsw==, figureFileBig=4Idyp+2/CbRXjMKUs0y5bA==, tableContent=null), ArticleFig(id=1241064312119284273, tenantId=1146029695717560320, journalId=1235980550691926019, articleId=1241064283711263338, language=EN, label=Fig.2, caption=
Schematic diagram of multi-step simulation strategy, figureFileSmall=VM64ucfrP44cR/kZm9R1ug==, figureFileBig=8JQPCB9EelFn7ZSsdyK9zA==, tableContent=null), ArticleFig(id=1241064312274473528, tenantId=1146029695717560320, journalId=1235980550691926019, articleId=1241064283711263338, language=CN, label=图2, caption=
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Schematic diagram of LPBF model, figureFileSmall=nanfBytvr+/pNX7lMo+u7A==, figureFileBig=0Xx+3Eufy2hnThp3YqJjLQ==, tableContent=null), ArticleFig(id=1241064312681321027, tenantId=1146029695717560320, journalId=1235980550691926019, articleId=1241064283711263338, language=CN, label=图3, caption=
LPBF模型示意图, figureFileSmall=nanfBytvr+/pNX7lMo+u7A==, figureFileBig=0Xx+3Eufy2hnThp3YqJjLQ==, tableContent=null), ArticleFig(id=1241064312974922308, tenantId=1146029695717560320, journalId=1235980550691926019, articleId=1241064283711263338, language=EN, label=Fig.4, caption=
LSP finite element model and data acquisition path, figureFileSmall=qMmXPSEzmLgqvYmWLHurMw==, figureFileBig=45dleRfZYlKgifP8v5G/tA==, tableContent=null), ArticleFig(id=1241064313255940681, tenantId=1146029695717560320, journalId=1235980550691926019, articleId=1241064283711263338, language=CN, label=图4, caption=
LSP有限元模型及数据采集路径, figureFileSmall=qMmXPSEzmLgqvYmWLHurMw==, figureFileBig=45dleRfZYlKgifP8v5G/tA==, tableContent=null), ArticleFig(id=1241064313625039437, tenantId=1146029695717560320, journalId=1235980550691926019, articleId=1241064283711263338, language=EN, label=Fig.5, caption=
Curves of temperatures and stresses at different locations of LPBF model, figureFileSmall=LOzbuk0yo9gmXGkrzErXpg==, figureFileBig=TTq5lXy42LcMF52AkG0seQ==, tableContent=null), ArticleFig(id=1241064314048664144, tenantId=1146029695717560320, journalId=1235980550691926019, articleId=1241064283711263338, language=CN, label=图5, caption=
LPBF模型不同位置处温度和应力变化曲线, figureFileSmall=LOzbuk0yo9gmXGkrzErXpg==, figureFileBig=TTq5lXy42LcMF52AkG0seQ==, tableContent=null), ArticleFig(id=1241064315814466132, tenantId=1146029695717560320, journalId=1235980550691926019, articleId=1241064283711263338, language=EN, label=Fig.6, caption=
Measured and predicted residual stresses at different depths at the midpoint of LPBF sample surface, figureFileSmall=5Tu49MjCf0x4t3rGRfq9CA==, figureFileBig=sC6QjQh60Pky01CW8tdl2A==, tableContent=null), ArticleFig(id=1241064316103873111, tenantId=1146029695717560320, journalId=1235980550691926019, articleId=1241064283711263338, language=CN, label=图6, caption=
LPBF样品表面中点不同深度处残余应力测量值与预测值, figureFileSmall=5Tu49MjCf0x4t3rGRfq9CA==, figureFileBig=sC6QjQh60Pky01CW8tdl2A==, tableContent=null), ArticleFig(id=1241064316435223131, tenantId=1146029695717560320, journalId=1235980550691926019, articleId=1241064283711263338, language=EN, label=Fig.7, caption=
Residual stress distribution pattern along different paths in zero-stress and tensile-stress models before and after LSP treatment, figureFileSmall=aQJ/B5um5v4k7yarE6y12Q==, figureFileBig=sv1y9L80yEGY/nI9eCZtIQ==, tableContent=null), ArticleFig(id=1241064316586218076, tenantId=1146029695717560320, journalId=1235980550691926019, articleId=1241064283711263338, language=CN, label=图7, caption=
LSP处理前后零应力和拉应力模型中不同路径残余应力分布, figureFileSmall=aQJ/B5um5v4k7yarE6y12Q==, figureFileBig=sv1y9L80yEGY/nI9eCZtIQ==, tableContent=null), ArticleFig(id=1241064316737213026, tenantId=1146029695717560320, journalId=1235980550691926019, articleId=1241064283711263338, language=EN, label=Fig.8, caption=
Predicted and experimental measurements of residual stress along path P1 in different models, figureFileSmall=xBfLuua/2MmTfyeXDRpN5w==, figureFileBig=Vdzlkmu/ExvtdkWyDJFgYQ==, tableContent=null), ArticleFig(id=1241064316863042148, tenantId=1146029695717560320, journalId=1235980550691926019, articleId=1241064283711263338, language=CN, label=图8, caption=
不同模型中路径P1残余应力预测值与实验测量值, figureFileSmall=xBfLuua/2MmTfyeXDRpN5w==, figureFileBig=Vdzlkmu/ExvtdkWyDJFgYQ==, tableContent=null), ArticleFig(id=1241064316934345319, tenantId=1146029695717560320, journalId=1235980550691926019, articleId=1241064283711263338, language=EN, label=Table 1, caption=
LPBF process parameters
, figureFileSmall=null, figureFileBig=null, tableContent=
| 功率/W | 扫描速度/(mm·s-1) | 粉末层厚度/μm | 扫描间距/mm | 焦距/mm | 光斑半径/mm |
|---|
| 225 | 1 000 | 30 | 0.12 | 2 | 0.15 |
), ArticleFig(id=1241064317039202922, tenantId=1146029695717560320, journalId=1235980550691926019, articleId=1241064283711263338, language=CN, label=表1, caption=
LPBF工艺参数
, figureFileSmall=null, figureFileBig=null, tableContent=
| 功率/W | 扫描速度/(mm·s-1) | 粉末层厚度/μm | 扫描间距/mm | 焦距/mm | 光斑半径/mm |
|---|
| 225 | 1 000 | 30 | 0.12 | 2 | 0.15 |
), ArticleFig(id=1241064317160837744, tenantId=1146029695717560320, journalId=1235980550691926019, articleId=1241064283711263338, language=EN, label=Table 2, caption=
LSP process parameters
, figureFileSmall=null, figureFileBig=null, tableContent=
| 脉冲能量/J | 光斑半径/mm | 脉宽/ns | 重叠率/% | 牺牲层 | 约束层 |
|---|
| 10 | 2 | 10 | 50 | 黑胶带 | 去离子水 |
), ArticleFig(id=1241064317253112436, tenantId=1146029695717560320, journalId=1235980550691926019, articleId=1241064283711263338, language=CN, label=表2, caption=
LSP工艺参数
, figureFileSmall=null, figureFileBig=null, tableContent=
| 脉冲能量/J | 光斑半径/mm | 脉宽/ns | 重叠率/% | 牺牲层 | 约束层 |
|---|
| 10 | 2 | 10 | 50 | 黑胶带 | 去离子水 |
), ArticleFig(id=1241064317336998519, tenantId=1146029695717560320, journalId=1235980550691926019, articleId=1241064283711263338, language=EN, label=Table 3, caption=
J-C constitutive equation parameters for LPBF-Ti6Al4V alloy
, figureFileSmall=null, figureFileBig=null, tableContent=
| 初始屈服强度A/MPa | 硬化模量B/MPa | 应变硬化系数n | 应变率敏感系数C | 参考应变率 |
|---|
| 994.21 | 635.44 | 0.784 4 | 0.02 | 0.001 |
), ArticleFig(id=1241064317446050424, tenantId=1146029695717560320, journalId=1235980550691926019, articleId=1241064283711263338, language=CN, label=表3, caption=
适用于LPBF-Ti6Al4V合金的J-C本构方程参数
, figureFileSmall=null, figureFileBig=null, tableContent=
| 初始屈服强度A/MPa | 硬化模量B/MPa | 应变硬化系数n | 应变率敏感系数C | 参考应变率 |
|---|
| 994.21 | 635.44 | 0.784 4 | 0.02 | 0.001 |
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