球磨时间对M2粉末冶金高速钢组织与力学性能的影响

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摘要以羰基铁粉与碳化物粉末为原料,经过0~72 h高能球磨后双向压制成形,然后于1 205 ℃烧结1 h,制得M2粉末冶金高速钢,研究球磨时间对M2钢的碳氧含量、显微组织与力学性能的影响。结果表明,随球磨时间延长和原料混合粉末粒径减小,M2钢的氧含量显著提高,由于碳热反应,碳含量显著降低。M2钢的物相主要为Fe,M₆C,M₂C与MC相,随球磨时间延长,亚稳态M₂C型碳化物减少,M₆C与MC型碳化物增多。随球磨时间延长,M2钢的晶粒与碳化物尺寸变得细小,碳化物分布更均匀,M2钢的相对密度、硬度以及抗弯强度均明显提高。在球磨72 h条件下制备的高速钢相对密度为99.3%,硬度(HRC)和抗弯强度分别为50.6和2 852 MPa。

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	杨军浩
	刘如铁
	熊翔
	栾怀壮
	郝彦荣
	杨宝震
	陈洁

关键词 ：粉末冶金高速钢, 碳氧含量, 显微组织, 力学性能, 碳化物

Abstract：The M2 powder metallurgy high speed steel (PM HSS) was prepared with the carbonyl iron powders and carbide powders as raw materials. The powders were mixed via ball milling for 0-72 h, and then compacted by double-action pressing before sintered at 1 205 ℃ for 1h. The effect of the milling time on the carbon content, oxygen content, microstructure and mechanical properties of the M2 PM HSS were studied. The results show that with the increase of milling time, the particle size of the mixed powders decreases, the oxygen content increases significantly, and the carbon content of the M2 PM HSS decreases due to the carbon-thermal reduction. The main phases of M2 PM HSS are Fe, M₆C, M₂C and MC. With increasing milling time, metastable M₂C carbide decreases, while M₆C and MC carbides increase. Besides, with the increasing of milling time, the grain size of M2 PM HSS and particle size of carbide become finer, the carbide distribution is more uniform, and the relative density, hardness and bending strength of M2 PM HSS increase significantly. After milling for 72 h, the relative density of M2 PM HSS is 99.3%, and the hardness (HRC) and the bending strength are 50.6 and 2 852 MPa, respectively.

Key words： powder metallurgy high speed steel carbon and oxygen content microstructure mechanical properties carbide

收稿日期: 2020-04-24 出版日期: 2020-09-18

ZTFLH:

TG142.1

基金资助:国家重点研发计划资助项目(2016YFB0700302)

通讯作者: 刘如铁,教授,博士。电话：0731-88876566;E-mail: llrrtt@csu.edu.cn

引用本文:

杨军浩, 刘如铁, 熊翔, 栾怀壮, 郝彦荣, 杨宝震, 陈洁. 球磨时间对M2粉末冶金高速钢组织与力学性能的影响[J]. 粉末冶金材料科学与工程, 2020, 25(4): 296-303.
YANG Junhao, LIU Rutie, XIONG Xiang, LUAN Huaizhuang, HAO Yanrong, YANG Baozhen, CHEN Jie. Effect of milling time on the microstructure and mechanical properties of M2 powder metallurgy high speed steel. Materials Science and Engineering of Powder Metallurgy, 2020, 25(4): 296-303.

链接本文:

http://pmbjb.csu.edu.cn/CN/ 或 http://pmbjb.csu.edu.cn/CN/Y2020/V25/I4/296

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