首页|Zr含量对选区激光熔化IN738LC合金裂纹形成及力学性能的影响

Zr含量对选区激光熔化IN738LC合金裂纹形成及力学性能的影响

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选用工业用IN738LC合金粉末在相同打印工艺参数下,系统研究两批次不同Zr含量粉末(分别为0.024％和0.12％,质量分数)打印件在选区激光熔化成形过程中的裂纹密度、分布、形成机理及其对力学性能的影响.结果表明:当原始粉末中Zr含量从0.024％增加到0.12％时,裂纹密度(面积占比)在XOY面由0.15％增加到0.87％,在XOZ面由0.21％增加到1.81％;在熔池中心位置主要形成凝固裂纹,该裂纹沿外延生长的<001>取向柱晶晶界分布并扩展.样品1(0.024％Zr)的极限抗拉强度为1113 MPa,拉伸断口存在韧窝;当Zr含量增加到0.12 wt.％时(样品2),样品2的极限抗拉强度降至610 MPa,断口存在大量原始裂纹和裸露的柱晶晶界.通过进一步优化样品2的打印工艺参数,其极限拉伸强度提高到947 MPa,增幅达到55.2％,塑性也显著增加.
Effect of Zr content on crack formation and mechanical properties of IN738LC processed by selective laser melting
Two batches of commercial IN738LC alloy powders with different Zr contents were printed under the same parameters. The influences of Zr content (0.024 wt.％ and 0.12 wt.％, respectively) in powders on crack density, distribution, formation mechanism and mechanical properties of selective laser melting (SLM)-treated parts were systematically studied. It was found that the crack density (area ratio) increases from 0.15％to 0.87％in the XOY plane and from 0.21％to 1.81％in the XOZ plane along with the Zr content increase from 0.024 wt.％ to 0.12 wt.％ in the original powders. Solidification cracks are formed along the epitaxially grown <001>-oriented columnar grain boundaries in molten pool center. The ultimate tensile strength of Sample 1 (0.024 wt.％Zr) is 1113 MPa, and there are dimples in tensile fracture. With an increase in the Zr content to 0.12 wt.％(Sample 2), the ultimate tensile strength of Sample 2 decreases to 610 MPa, and there are numerous original cracks and exposed columnar grain boundaries in tensile fracture. The optimization of printing parameters of Sample 2 considerably increases the ultimate tensile strength by 55.2％to 947 MPa, and the plasticity is greatly improved.

selective laser meltingIN738LC alloyZr contentsolidification crackprocess parameter optimizationmechanical properties

胡勇、杨小康、康文江、丁雨田、许佳玉、张会莹

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兰州理工大学 省部共建有色金属先进加工与再利用国家重点实验室,兰州 730050

兰州理工大学 材料科学与工程学院,兰州 730050

选区激光熔化 IN738LC合金 Zr含量 凝固裂纹 工艺参数优化 力学性能

Major Project of Science and Technology of Gansu Province,ChinaHongliu First-class Discipline Construction Plan of Lanzhou University of Technology,China

17ZD2GC011CGZH001

2021

10.1016/S1003-6326(21)65582-6

中国有色金属学报(英文版)
中国有色金属学会

中国有色金属学报(英文版)

CSTPCDCSCDSCI
影响因子：1.183
ISSN：1003-6326
年,卷(期)：2021.31(5)
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