Al對淬回火H11鋼力學性能和碳化物的影響

張國文; 左鵬鵬; 何西娟; 盛振棟; 吳曉春

doi:10.13374/j.issn2095-9389.2018.02.011

Al對淬回火H11鋼力學性能和碳化物的影響

doi: 10.13374/j.issn2095-9389.2018.02.011

上海大學材料科學與工程學院, 上海 200072

基金項目:

國家重點研發計劃資助項目（2016YFB0300400，2016YFB0300402）

詳細信息

中圖分類號: TG156.1
計量
- 文章訪問數: 747
- HTML全文瀏覽量: 269
- PDF下載量: 19
- 被引次數: 0
出版歷程
- 收稿日期: 2017-06-09

Influence of Al on mechanical properties and carbides of quenched and tempered H11 steel

School of Materials Science and Engineering, Shanghai University, Shanghai 200072, China

摘要

摘要: 研究了Al質量分數為0.77%及不含Al的H11鋼在不同淬回火處理工藝下的硬度和沖擊功的變化規律，并對兩種鋼原始退火態、1060℃淬火、1060℃淬火+510℃回火、1060℃淬火+560℃回火和1060℃淬火+600℃回火處理后的試樣進行碳化物萃取，同時借助掃描電子顯微鏡（SEM）和X射線衍射儀（XRD）分析了Al對H11鋼中碳化物形態及類型的影響.結果表明：（1）Al能提高H11鋼的沖擊韌性和回火硬度，但會使淬火硬度有所降低.（2）Al可以促進H11鋼淬火過程中碳化物的溶解和元素的均勻分布.（3）Al會阻礙H11鋼回火過程中碳化物的析出和聚集，這種作用在560℃以下回火時更加顯著.（4）Al可以使H11鋼回火時的（Fe，Cr）₂C、MoC、Cr₇C₃類碳化物更加穩定，抑制（Fe，Cr）₃C、Mo₂C和Cr₂₃C₆類碳化物的析出，這是因為Al可以阻礙H11鋼中碳及合金元素在回火過程中的聚集.
- H11鋼 /
- 熱處理 /
- 碳化物 /
- 硬度 /
- 沖擊功
Abstract: H11 steel with mass fraction of Al (0.77% and 0) was treated by different quenching and tempering processes, and the variation of hardness and impact energy were systematically investigated. Moreover, carbide extraction at annealed, 1060℃ quenched, 1060℃ quenched + 510℃ tempered, 1060℃ quenched + 560℃ tempered, and 1060℃ quenched + 600℃ tempered were conducted. Finally, the type and morphology of carbides were analyzed by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The main conclusions are as follows:(1) Al can improve the impact toughness and tempering hardness of H11 steel; however, it reduces the hardness of quenching. (2) Al can promote the dissolution of carbides and the homogeneity of elements during the austenitizing process. (3) Al can prevent the precipitation and accumulation of carbides during the tempering process, which is more obvious under 560℃. (4) Al can prevent the accumulation of carbon and alloy elements, such that (Fe,Cr)₂C, MoC and Cr₇C₃ become more stable and suppresses the precipitation of (Fe,Cr)₃C, Mo₂C, and Cr₂₃C₆ during the tempering process.
- H11 steel /
- heat treatment /
- carbide /
- hardness /
- impact energy

HTML全文

參考文獻(13)

[1]	Delagnes D, Lamesle P, Mathon M H, et al. Influence of silicon content on the precipitation of secondary carbides and fatigue properties of a 5%Cr tempered martensitic steel. Mater Sci Eng A, 2005, 394(1-2): 435
[3]	Suh D W, Park S J, Oh C S, et al. Influence of partial replacement of Si by Al on the change of phase fraction during heat treatment of TRIP steels. Scripta Mater, 2007, 57(12): 1097
[4]	Peng H F, Song X, Gao A G, et al. Microstructure and mechanical properties of the Al-added ultrahigh carbon steel. Mater Lett, 2005, 59(26): 3330
[5]	Zhang X, Fan L J, Xu Y L, et al. Effect of aluminum on microstructure, mechanical properties and pitting corrosion resistance of ultra-pure 429 ferritic stainless steels. Mater Des, 2015, 65: 682
[6]	Traint S, Pichler A, Hauzenberger K, et al. Influence of silicon, aluminium, phosphorus and copper on the phase transformations of low alloyed TRIP-steels. Steel Res Int, 2002, 73(6-7): 259
[8]	Wu K M, Bhadeshia H K D H. Extremely fine pearlite by continuous cooling transformation. Scripta Mater, 2012, 67(1): 53
[9]	Palizdar Y, Scott A J, Cochrane R C, et al. Understanding the effect of aluminium on microstructure in low level nitrogen steels. Mater Sci Technol, 2009, 25(10): 1243
[10]	Li S S, Liu Y H, Song Y L, et al. Simplification of heat treatment process in a tool steel by aluminium addition. Mater Sci Technol, 2016, 32(15): 1597
[11]	Boc I, Grof T. The core-loss reducing effect of aluminum in non-oriented Fe-Si steels. IEEE Trans Magn, 1986, 22(5): 517
[15]	Torres H, Varga M, Ripoll M R. High temperature hardness of steels and iron-based alloys. Mater Sci Eng A, 2016, 671: 170
[16]	Danoix F, Danoix R, Akre J, et al. Atom probe tomography investigation of assisted precipitation of secondary hardening carbides in a medium carbon martensitic steels. J Microsc, 2011, 244(3): 305
[17]	Qian L H, Zhou Q, Zhang F C, et al. Microstructure and mechanical properties of a low carbon carbide-free bainitic steel co-alloyed with Al and Si. Mater Des, 2012, 39: 264
[18]	Souki I, Delagnes D, Lours P. Influence of heat treatment on the fracture toughness and crack propagation in 5% Cr martensitic steel. Procedia Eng, 2011, 10: 631