Cr含量对激光增材制造12CrNi2合金钢的组织结构的影响

doi:10.11901/1005.3093.2017.582

材料研究学报

2018, Vol. 32

Issue (11): 827-833 DOI: 10.11901/1005.3093.2017.582

本期目录 | 过刊浏览

Cr含量对激光增材制造12CrNi2合金钢的组织结构的影响

董志宏¹(

), 亢红伟², 谢玉江¹, 迟长泰¹, 彭晓³

1 中国科学院金属研究所金属腐蚀与防护实验室沈阳 110016
2 中国科学技术大学材料科学与工程学院合肥 230026
3 南昌航空大学材料科学与工程学院南昌 330063

Effect of Cr-Content on Microstructure of 12CrNi2 Alloy Steel Prepared by Laser Additive Manufacturing

Zhihong DONG¹(

), Hongwei KANG², Yujiang XIE¹, Changtai CHI¹, Xiao PENG³

1 Laboratory for Corrosion and Protection, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
2 College of Material Science and Engineering, University of Science and Technology of China, Hefei 230026, China
3 School of Materials Science and Engineering, Nanchang Hangkong University, Nanchang 330063, China

引用本文:

董志宏, 亢红伟, 谢玉江, 迟长泰, 彭晓. Cr含量对激光增材制造12CrNi2合金钢的组织结构的影响[J]. 材料研究学报, 2018, 32(11): 827-833.
Zhihong DONG, Hongwei KANG, Yujiang XIE, Changtai CHI, Xiao PENG. Effect of Cr-Content on Microstructure of 12CrNi2 Alloy Steel Prepared by Laser Additive Manufacturing[J]. Chinese Journal of Materials Research, 2018, 32(11): 827-833.

全文: PDF(5278 KB) HTML

摘要:

对商用12CrNi2合金钢粉末进行激光增材制造时发现,在沉积态合金钢内部产生了大量的孔洞。这种孔洞的形成,主要与溶池中的O与C反应生成的气泡有关。合金钢粉末中增加Cr量后,它因与O亲和力大而在溶池中优先“捕捉”O析出Cr₂O₃,有效地抑制了成形合金钢中孔洞的形成;Cr₂O₃的析出使成形合金钢铁素体和奥氏体的组织细化,提高了合金钢的显微硬度。

关键词 ：金属材料, 组织结构, 激光增材制造, Cr含量, 合金钢

Abstract：

12CrNi2 alloy steel has been prepared by means of laser additive manufacturing (LAM) using a commercial alloy steel powder. The results show that the LAMed alloy steel contains a large number of pores intrinsically associated with the reaction of O and C, which form gases in molten pool of the laser melting alloy steel powder. The pore formation can be highly suppressed by adding into the steel powder with small amounts of Cr, because it preferentially reacts with O to form Cr₂O₃ and consequently prevents the gases formation in the molten pool. The Cr₂O₃ formation also refines the ferrite and the austenite phases of the LAMed alloy steel and increases its hardness.

Key words： metallic materials microstructure laser additive manufacturing Cr content alloy steel

收稿日期: 2017-10-10

ZTFLH:

TG142.1

基金资助:国家重点研发计划(2016YFB1100203)

作者简介:

作者简介董志宏,男,1978年生,博士

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https://www.cjmr.org/CN/10.11901/1005.3093.2017.582 或 https://www.cjmr.org/CN/Y2018/V32/I11/827

表1 12CrNi2合金钢粉末的化学成分(质量分数,%)

图1 LMD成形过程的示意图

图2 12CrNi2合金钢粉末的表面和截面形貌

表2 12CrNi2合金钢颗粒表面氧化物的EDS分析结果

图3 原始(a)和增加4%Cr(b)的12CrNi2合金钢粉末LMD成形后的截面SEM像

图4 在激光成形过程中熔池中可能发生的化学反应的ΔG0随着温度的变化

图5 LMD合金钢的背散射像

图6 富Cr颗粒的TEM像及其相应的衍射图和元素分布图

图7 原始粉末LMD合金钢的金相组织OM像、BEI像及C元素面分布图以及主要组织及岛状组织的选区电子衍射图

图8 在Cr含量不同的条件下成形合金钢的XRD图谱

图9 Cr含量分别增加2%、3%、4%时成形合金钢的金相组织OM像

图10 在Cr量不同的条件下成形合金钢的显微硬度

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