等溫淬火溫度對超細貝氏體鋼組織及耐磨性的影響

張超; 郭輝; 王家星; 張冰; 趙愛民

doi:10.13374/j.issn2095-9389.2018.12.008

等溫淬火溫度對超細貝氏體鋼組織及耐磨性的影響

doi: 10.13374/j.issn2095-9389.2018.12.008

張超¹,
郭輝^1,2,
王家星³,
張冰¹,
趙愛民^1, ,

1) 北京科技大學鋼鐵共性技術協同創新中心, 北京 100083
2) 濰坊科技學院機械工程學院, 壽光 262700
3) 北京科技大學工程技術研究院, 北京 100083

基金項目:

國家自然科學基金資助項目（U1560107）

詳細信息

中圖分類號: TG142.71
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出版歷程
- 收稿日期: 2017-12-05

Effect of austempering temperature on the microstructure and wear resistance of ultrafine bainitic steel

1) Collaborative Innovation Center of Steel Technology, University of Science and Technology Beijing, Beijing 100083, China
2) School of Mechanical Engineering, Weifang University of Science and Technology, Shouguang 262700, China
3) Engineering Research Institute, University of Science and Technology Beijing, Beijing 100083, China

摘要

摘要: 設計了一種0.7C的低合金超細貝氏體鋼，并通過膨脹儀、二體磨損實驗、光學顯微鏡、掃描電鏡、X射線衍射、激光掃描共聚焦顯微鏡及能譜儀，研究了不同等溫淬火溫度對超細貝氏體鋼的貝氏體相變動力學、微觀組織以及干滑動摩擦耐磨性的影響，揭示超細貝氏體鋼在二體磨損條件下的耐磨性能和磨損機理.研究結果表明，不同等溫溫度下的超細貝氏體鋼都由片層狀貝氏體鐵素體和薄膜狀以及塊狀的殘留奧氏體組成；隨著等溫溫度的升高，超細貝氏體的相變速率提高，相變孕育期及相變完成時間縮短，但貝氏體鐵素體板條厚度增加，殘留奧氏體含量增加，硬度值有所降低；超細貝氏體鋼磨損面形貌以平直的犁溝為主，主要的磨損機理為顯微切削；不同等溫溫度下所獲得的超細貝氏體的耐磨性能都優于回火馬氏體，且隨著等溫溫度的降低，耐磨性能提高.其中在250℃等溫所獲得的超細貝氏體鋼具有最優的耐磨性能，其相對耐磨性為回火馬氏體的1.28倍.這主要與超細貝氏體鋼中貝氏體鐵素體板條的細化及磨損過程中殘留奧氏體的形變誘導馬氏體相變（TRIP）效應有關.
- 超細貝氏體鋼 /
- 相變動力學 /
- 殘留奧氏體 /
- 耐磨性能 /
- TRIP效應
Abstract: Ultrafine bainitic steels, which are derived from nanostructured carbide-free bainitic steels, exhibit a remarkable combination of ultra-high strength and toughness together with excellent wear resistance. Their excellent integrated mechanical properties has made ultrafine bainitic steels a popular choice for application as wear-resistant parts. In this study, a 0.7-C low alloy ultrafine bainitic steel was designed, and the effects of different austempering temperatures on the bainitic transformation kinetics, microstructure, and dry sliding wear resistance of ultrafine bainitic steels were studied. Dilatometry, two-body abrasion testing, optical microscopy (OM), scanning electron microscopy (SEM), X-ray diffraction, laser-scanning confocal microscopy, and energy-dispersive spectrometry were used to study the abovementioned effects. Meanwhile, the wear performance and wear mechanism under two-body abrasion of ultrafine baintic steels with different austempering temperatures were also studied. The results demonstrate that the microstructures of ultrafine bainitic steel produced at different austempering temperatures comprise both lamellar bainitic ferrite and film-like and blocky retained austenite. With increasing austempering temperature, the transformation rate of bainite increases, and the incubation period and phase transformation completion time of bainite significantly reduce; in addition, the bainitic ferrite plates are more coarsened, the volume fraction of retained austenite increases, and the hardness decreases. Moreover, when the ultrafine bainitic steel is subjected to the twobody abrasion test, the wear surface is mainly featured by furrows and grooves, and the predominant wear mechanism is micro-cutting. Furthermore, the wear resistance of ultrafine bainite post austempering at different temperatures is better than that of tempered martensite; this wear resistance increases with decreasing isothermal temperatures. Ultrafine baintic steel post austempering at 250℃ possesses the best wear resistance, and the relative wear resistance is 1.28 times higher than that of tempered martensitic steel; this is attributed to the refined microstructure and the transformation induced plasticity (TRIP) effect of ultrafine bainitic steel.
- ultrafine bainitic steel /
- phase transformation kinetic /
- retained austenite /
- wear resistance /
- TRIP effect

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參考文獻(23)

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