Carbide Evolution in High Molybdenum Nb-microalloyed H13 Steel during Annealing Process

被引：16

作者：

Li, Tian-sheng ^{[1
,2
]}

Wang, Fu-ming ^{[1
]}

Li, Chang-rong ^{[3
]}

Zhang, Guo-qing ^{[1
]}

Meng, Qing-yong ^{[1
]}

机构：

[1] Univ Sci & Technol Beijing, State Key Lab Adv Met, Beijing 100083, Peoples R China

[2] Hunan Inst Technol, Sch Mech Engn, Hengyang 421008, Hunan, Peoples R China

[3] Univ Sci & Technol Beijing, Sch Mat Sci & Engn, Beijing 100083, Peoples R China

来源：

JOURNAL OF IRON AND STEEL RESEARCH INTERNATIONAL | 2015年 / 22卷 / 04期

基金：

国家高技术研究发展计划(863计划);

关键词：

niobium microalloying; high molybdenum H13 steel; spheroidizing annealing; carbide; WORK TOOL STEEL; HOT; MICROSTRUCTURE; NIOBIUM;

D O I：

10.1016/S1006-706X(15)30008-X

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

Based on the Thermo-Calc thermodynamic software, the type of equilibrium precipitated carbides and their contents in high Mo Nb-microalloyed H13 steel (NMH13 steel) were calculated. The composition, morphology, and distribution of carbides after spheroidal annealing of two forged experimental steels were comparatively examined by means of optical microscopy (OM), scanning electron microscopy (SEM), electron dispersive spectroscopy (EDS) and transmission electron microscopy (TEM). VC, M23C6 and M6C are identified in H13 steel after spheroidizing annealing, while (V, Nb)C, M23C6, M2C and M6C are observed in NMH13 steel. Moreover, it is found that the addition of Nb significantly enhances the stability of MC phase and the high Mo content accelerates the precipitation of small rod-shape M2C phase in NMH13 steel. The amount of the fine carbides in NMH13 steel obviously increased with M2C and M6C precipitated from the ferrite phase, which is in accordance with the results of thermodynamic calculations.

引用

页码：330 / 336

页数：7

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