SLM成形Inconel 738合金缺陷的演变及形成机理

doi:10.11896/cldb.21040269

材料导报

2022, Vol. 36

Issue (13): 21040269-7 https://doi.org/10.11896/cldb.21040269

金属与金属基复合材料

SLM成形Inconel 738合金缺陷的演变及形成机理

马玉天¹, 许佳玉^2,3, 高钰璧^2,3, 刘博^2,3, 胡勇^2,3, 丁雨田^2,3,*, 陈大林¹, 陈韩锋¹

1 金川集团股份有限公司镍钴资源综合利用国家重点实验室,甘肃金昌 737100
2 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
3 兰州理工大学材料科学与工程学院,兰州 730050

Evolution and Formation Mechanism of Defect in SLM-Built Inconel 738 Alloy

MA Yutian¹, XU Jiayu^2,3, GAO Yubi^2,3, LIU Bo^2,3, HU Yong^2,3, DING Yutian^2,3,*, CHEN Dalin¹, CHEN Hanfeng¹

1 State Key Laboratory of Nickel and Cobalt Resources Comprehensive Utilization, Jinchuan Group Co., Ltd., Jinchang 737100, Gansu, China
2 State Key Laboratory of Advanced and Recycling of Nonferrous Metals, Lanzhou University of Technology, Lanzhou 730050, China
3 School of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou 730050, China

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摘要本工作通过选区激光熔化(SLM)成形Inconel 738合金,在不同工艺参数下分别对其进行单道次、多道次以及多层多道次的演化实验,旨在对其裂纹形成机制进行深入的研究。研究表明,当激光线能量密度E过高或者过低时,形成的孔隙会诱导裂纹的形成。在SLM成形Inconel 738合金中凝固裂纹和液化裂纹均有发生,液化裂纹占主要地位。凝固裂纹主要在凝固末期形成,由于晶体快速生长为枝晶骨架,其本身的变形发展良好,但枝晶间残留的液相则不易流动,在热拉应力的作用下产生的微小缝隙将无法被液体及时填充而形成凝固裂纹。而液化裂纹的形成主要是由于晶界处B元素的偏聚,促进晶界处形成低熔点的γ+γ′相,在循环热的作用下熔化形成液膜,液膜使得晶界处抗拉强度降低,在热拉应力的作用下形成液化裂纹。

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	马玉天
	许佳玉
	高钰璧
	刘博
	胡勇
	丁雨田
	陈大林
	陈韩锋

关键词: Inconel 738合金选区激光熔化(SLM) 激光线能量密度缺陷

Abstract: The evolution experiments of single-track, multi-tracks and multi-layers experiments were carried out on Inconel 738 alloy fabricated by selective laser melting (SLM) under different parameters, in order to further investigate the formation mechanism of crack defects. The results show that the formation of porosity will induce the formation of cracks when the laser energy density E is too high or too low. Both solidification cracks and liquation cracks occur in Inconel 738 alloy formed by SLM, and liquation cracks are dominated. At the end of solidification, the crystals rapidly grow to form a dendrite framework. At this time, the deformation of the dendrite framework can well develop, but the residual liquid phase between the crystals is hard to flow, and the tiny gap generating under the action of thermal tensile stress will not be filled in time, leading to solidification cracks. The formation of liquation crack is mainly due to the segregation of B element at grain boundaries, which leads to the formation of γ + γ′ phase with low melting point at grain boundaries. Under cyclic heat, liquid film is formed leading to the reduction of tensile strength at grain boundaries, which is pulled apart by thermal tensile stress to form liquation cracks.

Key words: Inconel 738 alloy selective laser melting (SLM) laser line energy density defect

出版日期: 2022-07-10 发布日期: 2022-07-12

ZTFLH:

TG146.1+5

基金资助: 甘肃省科技重大专项(17ZD2GC011);镍钴资源综合利用国家重点实验室开放课题;兰州理工大学红柳一流学科建设计划

通讯作者: * dingyt@lut.edu.cn

作者简介: 马玉天,博士,教授级高级工程师。1991年7月本科毕业于昆明理工大学热能工程专业;2006年3月博士毕业于中南大学冶金物理化学专业;2006年3月至今,在金川集团股份有限公司工作。现任金川镍钴研究设计院院长、镍钴资源综合利用国家重点实验室副主任。主持国家级项目1项、省级科研项目3项,参与国际合作项目1项,主导省级科研项目5项,负责10余项建设项目。发表论文34篇,获发明专利11项。指导潘从明研究项目《镍阳极泥中铂钯铑铱绿色高效提取技术》获2019年国家科学技术进步奖二等奖(工人农民技术创新组)。
丁雨田,兰州理工大学教授,博士研究生导师。1983年于西安交通大学铸造专业毕业,获工学学士学位;1986年于西安交通大学铸造专业毕业,获工学硕士学位;2005年兰州理工大学毕业,获工学博士学位。2016年获得冶金有色工业科技进步一等奖。现主要研究方向为镍基变形高温合金、3D打印用镍基高温合金粉末制备及镍基高温合金素化。在国内外学术刊物及学术会议上发表论文260余篇。

引用本文:

马玉天, 许佳玉, 高钰璧, 刘博, 胡勇, 丁雨田, 陈大林, 陈韩锋. SLM成形Inconel 738合金缺陷的演变及形成机理[J]. 材料导报, 2022, 36(13): 21040269-7.
MA Yutian, XU Jiayu, GAO Yubi, LIU Bo, HU Yong, DING Yutian, CHEN Dalin, CHEN Hanfeng. Evolution and Formation Mechanism of Defect in SLM-Built Inconel 738 Alloy. Materials Reports, 2022, 36(13): 21040269-7.

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http://www.mater-rep.com/CN/10.11896/cldb.21040269 或 http://www.mater-rep.com/CN/Y2022/V36/I13/21040269

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