Effect of Protective Atmosphere on Pores in Laser Remelting Zone of Gray Cast Iron

被引：2

作者：

Zhang Kun ^{[1
,2
]}

Liu Keyuan ^{[1
,2
]}

Ye Zhengting ^{[1
,2
]}

Zhao Haixing ^{[3
]}

Yang Gaolin ^{[1
,2
]}

Cui Jinpeng ^{[3
]}

Hu Yong ^{[1
,2
]}

Yao Jianhua ^{[1
,2
]}

机构：

[1] Zhejiang Univ Technol, Inst Laser Adv Mfg, Hangzhou 310014, Zhejiang, Peoples R China

[2] Zhejiang Prov Collaborat Innovat Ctr High End Las, Hangzhou 310014, Zhejiang, Peoples R China

[3] Shanghai Elect Power Generat Equipment Co Ltd, Turbine Works, Shanghai 201199, Peoples R China

来源：

CHINESE JOURNAL OF LASERS-ZHONGGUO JIGUANG | 2018年 / 45卷 / 01期

关键词：

laser technique; laser remelting; gray cast iron; pores;

D O I：

10.3788/CJL201845.0102005

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

The mechanisms of pore formation in the remelting zone under different protective atmosphere conditions are investigated by the laser remelting experiments of HT250 gray cast irons. The study results show that the pores in the remelting zone are dissolved pores under the argon shielding atmosphere, and the pores are dissolved pores and reactive pores under the open atmosphere. With the same process parameters, there are more pores in the melting zone under the open atmosphere than those under the argon shielding atmosphere at a low scanning speed, however, at a high scanning speed, the pores are basically the same under these two protective atmosphere conditions. When the laser energy density is relatively low, the main reason of pore formation in the remelting zone is the dissolving out of gasses from the gray cast irons.

引用

页数：8

共 17 条

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