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激光金属直接成形DZ125L高温合金柱状晶连续生长的数值模拟与实验研究

Numerical Experimental Investigation on the Epitaxial Growth of Columnar Crystal in Laser Metal Direct Forming of DZ125L Super-Alloy

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摘要

采用“生死单元”技术模拟了激光金属直接成形DZ125L单层单道和单层两道试样时扫描单元内部温度场的分布情况,分析了熔池温度梯度的分布与试样内部金相组织演变的关系并进行了实验验证。结果表明,成形单层单道试样时,柱状晶能够从基材连续向上生长,熔池中间部位柱状晶连续生长得最高,并且熔池顶部容易形成等轴晶;成形单层两道试样时,扫描方式与搭接率对温度场分布及金相组织的转变影响较大,往复扫描方式下搭接区容易产生转向枝晶,搭接率过小会严重影响两道搭接处柱状晶的连续生长。模拟结果和实验结果吻合得较好。

Abstract

The effect of scanning methods and overlap rate on the temperature field and microstructure evolution of DZ125L super-alloy elementary unit in laser metal direct forming is investigated numerically and experimentally. The results show that temperature field in the molten pool leads to the epitaxial growth of columnar crystal from the substrate; the columnar crystal grows highest at the center position; it is multi-directional crystal at the high part. For double-track forming, the temperature field and the change of microstructure in the overlap zone are strongly influenced by the scanning method and the overlap rate; the back-and-forth scanning method easily leads to the change of the solidified direction; the epitaxial growth of columnar crystal between cladding tracks is obtained when the overlap rate is big enough. The results of calculation agree well with that of experiment.

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中图分类号:TG111;TG24

DOI:10.3788/cjl201340.0603008

所属栏目:激光制造

责任编辑:宋梅梅  信息反馈

基金项目:国家973计划(2007CB707704)和国家自然科学基金(51005177,51275392)资助课题。

收稿日期:2013-01-09

修改稿日期:2013-02-28

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Do Xuantuoi:西安交通大学机械制造系统工程国家重点实验室, 陕西 西安 710054
李涤尘:西安交通大学机械制造系统工程国家重点实验室, 陕西 西安 710054
张安峰:西安交通大学机械制造系统工程国家重点实验室, 陕西 西安 710054
贺斌:西安交通大学机械制造系统工程国家重点实验室, 陕西 西安 710054

联系人作者:Do Xuantuoi(dxtuoi76@gmail.com)

备注:Do Xuantuoi(1976—),男,博士研究生,主要从事激光金属直接成形方面的研究。

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引用该论文

Do Xuantuoi,Li Dichen,Zhang Anfeng,He Bin. Numerical Experimental Investigation on the Epitaxial Growth of Columnar Crystal in Laser Metal Direct Forming of DZ125L Super-Alloy[J]. Chinese Journal of Lasers, 2013, 40(6): 0603008

Do Xuantuoi,李涤尘,张安峰,贺斌. 激光金属直接成形DZ125L高温合金柱状晶连续生长的数值模拟与实验研究[J]. 中国激光, 2013, 40(6): 0603008

被引情况

【1】齐宝路,张安峰,张文龙,师博飞,李涤尘. 激光定向生长修复DZ125L柱状晶叶片力学性能研究. 中国激光, 2015, 42(6): 603002--1

【2】杜秋,杭小琳,王明娣,孙立宁. 激光铣削对激光熔覆成形件的整形机理和实验研究. 激光与光电子学进展, 2015, 52(10): 101403--1

【3】罗登,路媛媛,郭溪溪,杜锦铮,刘德健. 单晶高温合金V槽的激光修复工艺研究. 中国激光, 2016, 43(5): 503001--1

【4】杨海欧,韩加军,林鑫,黄卫东. 热处理对激光立体成形DZ125高温合金组织的影响. 中国激光, 2018, 45(11): 1102004--1

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