文章信息/Info

Title:

Effect of Electron Beam Current on Microstructure and Properties of H13 Steel Fabricated by Selective Electron Beam Melting

文章編號:

1674-3962(2022)04-0268-06

作者:

劉世鋒1; 宋璽1; 王巖1; 薛彤1; 王建2; 石英2

（1.西安建筑科技大學冶金工程學院，陜西 西安 710055）（2.西北有色金屬研究院 金屬多孔材料國家重點實驗室，陜西 西安 710016）

Author(s):

LIU Shifeng1;  SONG Xi1;  WANG Yan1;  XUE Tong1;  WANG Jian2;  SHI Ying2

(1. School of Metallurgical and Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China) （2. State Key Laboratory of Porous Metal Materials, Northwest Institute for Nonferrous Metal Research, Xi’an 710016, China)

關鍵詞:

H13鋼; 電子束選區熔化; 電子束束流; 微觀組織; 馬氏體

Keywords:

H13 steel;  selective electron beam melting;  electron beam current;  microstructure;  martensite

分類號:

TG142.1+4

DOI:

10.7502/j.issn.1674-3962��202110026

文獻標志碼:

A

摘要:

H13鋼是使用最廣泛和最具代表性的熱作模具鋼。采用電子束選區熔化（SEBM）技術成形H13鋼能夠有效解決其組織均勻度不理想的問題，而且可使其具有相當可觀的力學性能表現。通過改變SEBM技術的電子束束流制備H13模具鋼，并采用電子密度計、X射線衍射儀（XRD）、掃描電子顯微鏡（SEM）和顯微維氏硬度計表征了成形件的致密度、微觀組織和硬度，探究了電子束束流對成形件微觀組織演變和力學性能的影響。結果表明，不同電子束束流成形的H13鋼主要存在彌散的納米尺寸微孔、局部的微米尺寸微孔以及熔合不良區域；微觀組織主要為馬氏體、殘余奧氏體及碳化物；隨著電子束束流的增加，馬氏體會發生晶格畸變，基體強度增加，繼續提高電子束束流，馬氏體逐漸粗化，基體發生回復與再結晶，同時彌散析出二次碳化物，基體強度趨于穩定。

Abstract:

H13 steel is the most widely used and representative hot-working tool steel. The use of selective electron beam melting (SEBM) technology to form H13 steel can effectively solve the problem of unsatisfactory tissue uniformity, and it has considerable mechanical properties. In this paper, H13 steel was prepared by changing the electron beam current of SEBM technology, and the densities, microstructures and hardness of the formed parts were characterized by electron densitometry, X’ray diffractometer (XRD), scanning electron microscope (SEM) and micro-Vickers hardness tester. The effects of the electron beam current on the microstructure evolution and mechanical properties were investigated. The results show that the H13 steel formed by different electron beam current mainly has dispersed nano-sized micropores, local micro-sized micropores and poor fusion areas. The microstructure is mainly composed of martensite, residual austenite and carbide. With the increase of the electron beam current, the martensite will undergo lattice distortion and the matrix strength will increase. And if the electron beam current continues to be increased, the martensite will gradually dissolve, the matrix will recovery and recrystallization, while secondary carbide will be diffusely precipitated and the matrix strength will stabilize.