赵时璐张钧刘常升
中国腐蚀与防护学报
采用多弧离子镀技术，用Ti-Al-Zr合金靶和Cr靶，在 W18Cr4V高速钢基体上沉积了(Ti, Al, Zr,\linebreak Cr)N多元膜，并进行了600 ℃，700 ℃，800 ℃和900 ℃短时(4 h)高温氧化实验及 700 ℃和800 ℃长期(100 h) 高温循环氧化实验。用扫描电镜 (SEM)、能谱(EDS)和X射线衍射(XRD)观察和分析样品表面氧化膜。结果表明，这种多元膜在短时(4 h)高温氧化条件下，800 ℃时仍具有良好的抗高温氧化性，XRD显示氧化膜主要为TiO2；在长期(100 h)高温氧化条件下，该多元膜的抗高温氧化温度大约为700 ℃左右
关键词:
多弧离子镀(Ti, Al, Zr, Cr)
,
(Ti, Al, Zr, Cr) N film
,
high speed steel
,
high temperature oxidation resistance
SHI Gongqi DING Peidao ZHO U Shouze Chongqing University
,
Chongqing
,
China
金属学报(英文版)
The morphology and structure of δ-eutectoid and the transformation of δ-eutectoidic austenite in high speed steel have been studied under SEM and TEM.The δ-eutectoid in as-cast high speed steel is rod-shaped eutectoidic units with different orientations and is markedly surrounded by carbide shell.The eutectoidic carbide is rod-shaped M_6C of square eross section.The eutectoidic austenite may transform into pearlite structure during cooling.
关键词:
high speed steel
,
null
,
null
M.C.Huang
,
C.H.Gao
,
L.G.Huang
金属学报(英文版)
The microscopic structure change rule in high speed steel (HSS) after an additional cryogenic treatment was studied in this paper. Highly dispersed nano-carbide (η-Fe2C)separated from tempering martensite was found distributed on twin planes of martensite and dislocation places. Retained austenite was found sheared into martensite and nano-carbide separated at the same time. In addition, the tempering martensite was fine-grained. The stated changes of HSS evidently improve the lifespan of HSS cutter and fully show the advantages of nano-structure. The cryogenic treatment of HSS also improves the roughness of HSS cutter (decrease Ra number by about 50) and greatly increases the wear resistance of HSS cutter. Further experiments on the wear characteristic of HSS cutter supported the findings mentioned above. The stated HSS treatment technology would implement nano-structure of traditional tool steel through phase change. It could be a new method to improve the performance of HSS cutter.
关键词:
high speed steel
,
null
,
null
YU Xuejie Shanghai Iron and Steel Research Institute
,
Shanghai
,
China ZHOU Tianjian Anhui Institute of Technology
,
Hefei
,
China YU Xuejie Senior Engineer
,
Shanghai Iron and Steel Research Institute
,
1001 Taihe Road
,
Wusong
,
Shanghai 200940
,
China
金属学报(英文版)
The mechanical properties and structure of bainite and martensite after tempering m 6-5-4-2 high speed steel have been investigated.It was found that the secondary hardening effect and resistance to heat softening as well as impact toughness are higher in the bainite than in the martensite.TEM observations show that the(Fe,M)_3C precipitated in the martensite after tempering at temperature near the peak of hardness-tempering temperature curve.However, no(Fe,M)_3C but the dispersive MC and M_2C precipitated in the ferrite and austenite of bainite after tempering at the same temperature.This indicates that the diffusion of alloy ele- ments forming carbide might exist during the process of bainite growing.
关键词:
high speed steel
,
null
,
null
C.D.Zhou
,
J.F.Fan
,
H.R.Le
,
Y.J.Lin
,
D.S.Sun
,
J.G.Zhang
金属学报(英文版)
The mechanical properties and microstructure characteristics of a high speed steel (HSS) for roll has been studied. As compared with the as-cast HSS, the spray-formed HSS have fine grain and segregation free microstructures. Carbides distribute uniformly. The morphology and types of the carbides in spray-formed HSS are different from those in as-cast HSS. The results of the high temperature tensile experiment show that, as to spray-formed HSS, there is a possibility of superplastic deformation in the range of 780-810
关键词:
spray forming
,
null
,
null
ZHANG Henghua MA Ruzhang SU Shizhang CHANG Ruqin JIN Huijuan XU Guiqin ** Beijing University of Science and Technology
,
Beijing
,
100083
,
China*** Shanghai Iron and Steel Research Institute
,
Shanghai
,
200940
,
China+ To whom correspondence should be addressed
材料科学技术（英）
The retained austenite in high speed steel of two different heat treatment regimes was quantitatively,determined by transmission Mssbauer spectroscopy (TMS),backscattering X-ray geometry,Mossbauer spectroscopy (BXMS) and X-ray diffraction technique.The results meas- ured by these methods were in agreement with each other.It was demonstrated that the concentration of carbides in high speed steel could be measured by transmission Mossbauer spectroscopy or Mossbau- er spectroscopy in backscattering X-ray geometry accurately.
关键词:
Mssbauer spectroscopy
,
null
,
null
迟宏宵
,
马党参
,
占礼春
,
徐辉霞
,
朱旺龙
材料热处理学报
采用OM，SEM，EDS，TEM以及力学性能试验，研究了热处理工艺对不同尺寸规格的粉末冶金高速钢W6Mo5Cr4V3Co8微观组织和力学性能的影响。结果表明，区别于普通高速钢，粉末冶金高速钢微观组织中没有大颗粒尺寸共晶碳化物，退火组织中碳化物均匀、细小，颗粒尺寸小于3μm。因此，不同尺寸规格钢材以及不同截面方向的组织都保持着高度的一致性；试验钢在1080～1180℃较宽的温度范围内淬火都能够获得67HRC以上的硬度。淬火后的组织为马氏体＋残留奥氏体＋未溶碳化物，淬火奥氏体晶粒尺寸非常细小；经过高温回火后，试验钢存在明显的二次硬化效应，二次硬化峰出现在520℃。二次硬化现象是由残留奥氏体转变和合金碳化物析出共同作用的结果，TEM分析显示，试验钢经高温回火析出的二次硬化碳化物包含VC；冲击韧性试验结果表明，不同截面尺寸粉末高速钢的冲击韧性基本相当，同一钢材其横向和纵向的冲击韧性相差不大。
关键词:
粉末冶金
,
高速钢
,
微观组织
,
力学性能
曹燕
,
张军田
,
殷福星
,
刘相华
材料热处理学报
针对高速钢轧辊剥落试样，通过SEM对试样表面裂纹、内部裂纹和断口形貌进行了观察，同时对样品进行了EDS分析及硬度测试，研究了高速钢轧辊组织中碳化物种类、形态及分布，分析了影响疲劳裂纹形成、扩展因素，以及硬度和耐磨性变化的影响因素。结果表明：高速钢轧辊表面产生热疲劳裂纹的主要原因是由于轧辊受到剧烈的冷热温度交替变化，在辊表面产生严重热应变，出现热疲劳裂纹，扩展后造成剥落。裂纹萌生、扩展路径和方式与热疲劳或接触疲劳应力有关，减少轧辊中夹杂物的数量，细化夹杂物状态，改善轧辊组织中碳化物的形态和分布，有利于减轻热疲劳裂纹的萌生和扩展。
关键词:
高速钢
,
轧辊
,
疲劳
,
碳化物
,
裂纹萌生和扩展
