含铌中铬耐磨铸钢的摩擦磨损行为

doi:10.11901/1005.3093.2018.403

材料研究学报

2019, Vol. 33

Issue (4): 313-320 DOI: 10.11901/1005.3093.2018.403

本期目录 | 过刊浏览

含铌中铬耐磨铸钢的摩擦磨损行为

张拓,滕铝丹,臧其玉,杨弋涛(

)

上海大学材料科学与工程学院上海 200444

Friction and Wear Behavior of Niobium Alloyed Medium Chromium Wear-resistant Cast Steel

Tuo ZHANG,Lvdan TENG,Qiyu ZANG,Yitao YANG(

)

School of Materials Science and Engineering, Shanghai University, Shanghai 200444, China

引用本文:

张拓,滕铝丹,臧其玉,杨弋涛. 含铌中铬耐磨铸钢的摩擦磨损行为[J]. 材料研究学报, 2019, 33(4): 313-320.
Tuo ZHANG, Lvdan TENG, Qiyu ZANG, Yitao YANG. Friction and Wear Behavior of Niobium Alloyed Medium Chromium Wear-resistant Cast Steel[J]. Chinese Journal of Materials Research, 2019, 33(4): 313-320.

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摘要:

使用立式MM-W1型销盘摩擦磨损试验机进行含铌中铬耐磨铸钢的室温干滑动摩擦磨损实验，用扫描电子显微镜(SEM)和能谱仪(EDS)观察磨损表面形貌和亚表层的组织变化，研究了Nb含量对这种钢的磨损行为和磨损机制的影响。结果表明，加入0.2%（质量分数，下同）的Nb形成的不连续棒状铌碳化物和晶粒细化提高了试验钢的耐磨性能。但是，Nb含量过高则使钢发生严重的组织变形和生成粗大网状碳化物，使磨损表面脱落而降低耐磨性能。随着试验载荷的增大，含0.2%Nb试验钢的磨损机理从轻微磨粒磨损向黏着磨损和氧化磨损转变。

关键词 ：金属材料, 铌含量, 中铬耐磨铸钢, 碳化物, 磨损机理

Abstract：

Tribological behavior of experimental medium chromium wear-resistant cast steels with different niobium addition was investigated by using the MM-W1 pin-on-disc friction and wear tester at room temperature. The microstructure of the worn surface and subsurface were characterized by means of scanning electron microscopy and energy dispersive spectrometer, aiming to reveal the effect of Nb content on the wear behavior and mechanism for the steels. The results show that the addition of 0.2% (mass fraction) Nb can effectively increase the wear resistance of the steel due to the formation of discontinuous rod-like Nb carbides and the effect of grain refinement. An excess addition of Nb can reduce the wear resistance due to the occurrence of coarse mesh carbides and microstructural distortions, which then causes spallation of the worn surface. The 0.2%Nb test steel presented an evolvement of wear mechanism from slight abrasive wear to adhesive wear and oxidation wear.

Key words： metallic materials niobium content medium chromium wear-resistant cast steel carbide wear mechanism

收稿日期: 2018-06-22

ZTFLH:

TH117.1

作者简介: 张拓，男，1993年生，硕士

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https://www.cjmr.org/CN/10.11901/1005.3093.2018.403 或 https://www.cjmr.org/CN/Y2019/V33/I4/313

表1 试验耐磨铸钢的化学成分(质量分数，%)

图1 销盘结构的示意图

图2 在不同磨损参数条件下磨损失重随Nb含量的变化

图3 在200 N和0.5 m/s条件下不同Nb含量试验钢的磨损表面和能谱

表2 不同Nb含量试样磨损表面元素的EDS分析

图4 试验钢中碳化物的SEM形貌和晶粒尺寸

表3 试验钢的硬度、碳化物和晶粒尺寸随Nb含量的变化

图5 磨损截面的SEM形貌

图6 Nb含量为0.2%试验钢在不同载荷下的摩擦系数

图7 Nb含量为0.2%试验钢在不同载荷下的磨损形貌和能谱

图8 Nb含量为0.2%试验钢在不同载荷下的磨损截面

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