Wear Behavior and Hardening Mechanism of Novel Lightweight Fe-25.1Mn-6.6Al-1.3C Steel Under Impact Abrasion Conditions

被引：21

作者：

Peng, Shi-guang ^{[1
]}

Song, Ren-bo ^{[1
]}

Sun, Ting ^{[2
]}

Pei, Zhong-zheng ^{[1
]}

Cai, Chang-hong ^{[1
]}

Feng, Yi-fan ^{[1
]}

Tan, Zhi-dong ^{[1
]}

机构：

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

[2] Cent Iron & Steel Res Inst, Beijing 100081, Peoples R China

来源：

TRIBOLOGY LETTERS | 2016年 / 64卷 / 01期

关键词：

Novel lightweight; Fe-25.1Mn-6.6Al-1.3C cast steel; Impact abrasive wear; Nano-size carbides; Lomer-Cottrell locks; Dislocation walls; HADFIELD MANGANESE STEEL; HIGH-STRENGTH; ALLOYS; DUCTILITY; DEFORMATION; ALUMINUM; MICROSTRUCTURES; TEMPERATURE;

D O I：

10.1007/s11249-016-0751-2

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

The aim of the present work was to reveal the wear behavior and hardening mechanism of novel lightweight Fe-25.1Mn-6.6Al-1.3C cast steel under abrasive impact wear with different heat treatments. The impact wear tests were carried out by using MLD-10 abrasive wear testing tester under the same impact wear condition. For this purpose, the cast steel upon quenching (Q) and quenching (1050 degrees C) + aging (Q-A) at 550 degrees C for a different time from 1 to 4 h was chosen to conduct impact abrasive wear tests. It was shown that the best wear resistance of Fe-25.1Mn-6.6Al-1.3C steel under Q-A (2 h) process was about 2.29 times higher than that of under Q process, which results from the fact that the fine nano-size second-phase (Fe, Mn)(3)A1C kappa-carbides tend to precipitate coherently within the austenite matrix under the additional aging treatment. In consequence, the fine nanosize kappa-carbides improved both the initial hardness and wear resistance of the substrate. However, when the specimen was treated at 550 degrees C for longer aging time (4 h), coarse kappa-carbides would precipitate around the grain boundaries, which made the material extremely brittle and decreased the wear resistance. The surface hardening showed Lomer-Cottrell locks, high density of dislocation tangles and dislocation walls; neither martensite nor mechanical twins were observed under the low impact energy condition for both heat treatment processes.

引用

页数：10

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