新型轻质奥氏体耐磨钢的冲击磨损性能及其机理研究

doi:10.11901/1005.3093.2016.396

材料研究学报

2017, Vol. 31

Issue (7): 537-546 DOI: 10.11901/1005.3093.2016.396

研究论文

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新型轻质奥氏体耐磨钢的冲击磨损性能及其机理研究

彭世广¹, 宋仁伯¹, 蔡长宏¹, 裴中正¹, 郭客^2,³, 王忠红³, 高景俊⁴

1 北京科技大学材料科学与工程学院北京 100083
2 辽宁科技大学化学工程学院鞍山 117022
3 鞍钢集团矿业设计研究院鞍山 114004
4 鞍钢集团矿业公司鞍山 114001

Impact Wear Behavior of a Novel Light-weight Austenitic Wear-resistant Steel

Shiguang PENG¹, Renbo SONG¹, Changhong CAI¹, Zhongzheng PEI¹, Ke GUO^2,³, Zhonghong WANG³, Jingjun GAO⁴

1 School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China
2 School of Chemical Engineering, University of Science and Technology Liaoning, Anshan 117022, China
3 Angang Group Mining Engineering Corporation, Anshan 114004, China
4 Anshan Iron and Steel Group Mining Company, Anshan 114001, China

引用本文:

彭世广, 宋仁伯, 蔡长宏, 裴中正, 郭客, 王忠红, 高景俊. 新型轻质奥氏体耐磨钢的冲击磨损性能及其机理研究[J]. 材料研究学报, 2017, 31(7): 537-546.
Shiguang PENG, Renbo SONG, Changhong CAI, Zhongzheng PEI, Ke GUO, Zhonghong WANG, Jingjun GAO. Impact Wear Behavior of a Novel Light-weight Austenitic Wear-resistant Steel[J]. Chinese Journal of Materials Research, 2017, 31(7): 537-546.

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摘要:

以高锰钢Mn13Cr2为对比材料,采用MLD-10冲击磨料磨损试验机,选择低冲击载荷0.5 J,研究新型轻质Fe-24Mn-7Al-1.0C奥氏体耐磨钢在水韧处理和水韧处理+时效后的耐磨性能及磨损机理。结果表明,轻质奥氏体钢Fe-24Mn-7Al-1.0C在水韧处理后其耐磨性是Mn13Cr2的1.14倍;550℃不同时间时效后,由于大量的纳米尺寸κ-碳化物析出,增加了其初始硬度、强度和耐磨性,1050℃水韧处理+550℃时效1 h后其耐磨性达到最佳,为Mn13Cr2的1.40倍。Mn13Cr2磨损表面主要以长而宽且凹凸不平的犁沟和反复塑性变形导致的较深凿坑为主,轻质奥氏体钢Fe-24Mn-7Al-1.0C以微小凿坑和较浅犁沟为主。在Mn13Cr2的冲击亚表层形成大量层错以及凌乱分布的位错。轻质奥氏体钢Fe-24Mn-7Al-1.0C时效前的亚表层出现大量的泰勒晶格,并在时效1 h后呈现泰勒晶格和高密度位错墙,在磨损表面并没有发现孪晶和马氏体相变现象。

关键词 ：金属材料, 轻质奥氏体钢, 水韧处理+时效, 冲击磨损, κ-碳化物, 泰勒晶格

Abstract：

The wear resistance and wear mechanism of a novel light-weight Fe-24Mn-7Al-1.0C austenitic steel after water quenching (Q) and water quenching-aging (Q-A) treatments were studied by comparing with the Mn13Cr2. The impact wear tests were carried out by using MLD-10 abrasive wear testing tester under low impact energy condition (0.5 J). Results show that the wear resistance of Fe-24Mn-7Al-1.0C steel is 1.14 times higher than that of the water quenched Mn13Cr2. A large number of nano-sized (Fe, Mn)₃AlC κ-carbide precipitates increase the initial hardness, strength and wear resistance of the steel after aging treatment at 550℃ for different time. The wear resistance of Fe-24Mn-7Al-1.0C steel is optimum after 1050℃ quenching and aging 1 h at 550℃, which is 1.40 times higher than that of Mn13Cr2. The worn surfaces of Mn13Cr2 consist of wide, long, uneven grooves and deep peeling pits, of which the formation may be ascribed to the repeated plastic deformation, while worn surfaces of the Fe-24Mn-7Al steel consist of tiny peeling pits and light grooves. Many stacking faults and dislocations in different directions are found on the subsurface of Mn13Cr2. Many Taylor lattices are found at the impact subsurface of Fe-24Mn-7Al steel before aging treatments. After aging treatment for 1 h at 550℃, Taylor lattices and high-density dislocations are found, but no twins and martensitic transformation appear on the worn surface.

Key words： metallic materials light-weight austenitic steel water quenching-aging impact wear κ- carbide Taylor lattices

收稿日期: 2016-07-11

ZTFLH:

TG142. 25

作者简介:

作者简介彭世广,男,1987年生,博士生

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https://www.cjmr.org/CN/10.11901/1005.3093.2016.396 或 https://www.cjmr.org/CN/Y2017/V31/I7/537

表1 实验材料的化学成分

图1 冲击磨损试验机结构原理图

图2 Mn13Cr2和Fe-24Mn-7Al-1.0C的真实应力-应变曲线和加工硬化曲线

表2 不同热处理工艺条件下实验材料的力学性能

图3 Mn13Cr2和Fe-24Mn-7Al-1.0C的显微组织形貌

图4 不同热处理工艺条件下Fe-24Mn-7Al-1.0C的基体组织及选区电子衍射花样

图5 不同热处理工艺条件下Fe-24Mn-7Al-1.0C的XRD

图6 Mn13Cr2和Fe-24Mn-7Al-1.0C钢的耐磨性以及相对耐磨性

图7 水韧处理后的Mn13Cr2以及不同热处理工艺处理后的Fe-24Mn-7Al-1.0C的冲击磨损表面形貌SEM像

图8 水韧处理后的Mn13Cr2以及不同热处理工艺处理后的Fe-24Mn-7Al-1.0C 的冲击磨损亚表面形貌TEM像

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