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1.
超高强度马氏体时效钢的发展   总被引:11,自引:3,他引:11  
马氏体时效钢是以无碳(或超低碳)铁镍马氏体为基体的经时效生产金属间化合物沉淀硬化的超高强度钢。该钢在高强度时效处理前具有良好的成形性,时效处理几乎不变形,时效处理后有高强韧性。文中论述了典型Ni-Co-Mo-Ti-Al马氏体时效钢和Ni-Mo-Ti(-Cr-Al)无钴马氏体时效钢的化学成分和力学性能,阐述了马氏体时效钢在400~500℃时效时马氏体基体内产生大量强化效果极高、韧性损失极小的金属间化合物沉淀相的时效结构和强化机制,以及Ni、Co、Mo、Cr、Mn、Ti等元素在马氏体时效钢中的合金化作用。概述了马氏体时效钢的生产工艺,应用和发展趋向。  相似文献   

2.
研究了未再结晶固溶处理对18Ni型无钴马氏体时效钢组织和拉伸性能的影响.研究结果表明,无钴马氏体时效钢经过未再结晶同溶处理后,马氏体形貌由块状转变为细小的条束状,拉伸断口上的韧窝明显变小变密;固溶态的硬度提高约3(HRC),抗拉强度提高约100 MPa;而时效态的硬度和强度提高幅度较小.  相似文献   

3.
专利公报     
申请号 85107993申请人北京钢铁学院发明人何肇基杨让裘尧健发明名称马氏体时效钢本发明提供一种马氏体时效钢,在化学成分中不含钴,其特征成分为:C≤0.02%,S≤0.02%,P≤0.02%,Mn≤0.1%,Si≤0.1%,Ni14  相似文献   

4.
马氏体时效钢的研究现状与发展   总被引:1,自引:0,他引:1  
马氏体时效钢是指以无碳或微碳的铁镍马氏体为基体,时效时能产生金属间化合物以进行沉淀硬化的超高强度钢。回顾了马氏体时效钢的发展历程,通过论述马氏体时效钢中各合金元素的作用讨论了其合金化的特点,结合马氏体时效钢的性能特点,介绍了其应用现状。此外,重点阐述了马氏体时效钢的氢脆敏感性问题,并对其未来的发展提出展望。  相似文献   

5.
超高强度钢     
《钢铁》1986,(2)
本文摘译自《金属》1984年№4,罔田康文章,文中主要叙述了高强度钢发展过程,马氏体时效钢的强化机制和马氏体时效钢的某些用途。对了解马氏体时效钢的全貌和进一步扩大马氏体时效钢的使用有所启示、现将主要内容介绍如下:  相似文献   

6.
用穆斯堡尔谱研究了钴含量对高Ni-Co二次硬化钢微结构的影响。发现:随着钢中钴含量的减少,马氏体中的钴作为铁原子近邻的原子组态总量减少,钴在马氏体中的分布会影响镍,铬,钼原子在马氏体中的分布;钴促进奥氏体向马氏体转变,减少残余奥氏体量,钴促进合金碳化物的形成,增加其析出量。  相似文献   

7.
通过采用固溶、深冷及时效等处理方式,对18Ni马氏体时效钢进行了不同热处理工艺试验,研究了深冷处理对18Ni马氏体时效钢性能及组织的影响。结果表明,18Ni马氏体时效钢经深冷处理后硬度能有效提高;随着深冷处理时间的延长,材料的性能仍有所提升。深冷处理能使材料中的残余奥氏体向马氏体转变,但不能完全消除残余奥氏体。  相似文献   

8.
马氏体时效不锈钢的发展现状   总被引:33,自引:4,他引:29  
叙述了马氏体时效不锈钢的材料开发、成分、性能和组织结构的发展现状,该钢的发展趋势是降低钢中气体、夹杂和有害元素含量,开发超细化晶粒和均匀组织,超高强度和耐腐蚀性的马氏体时效不锈钢。  相似文献   

9.
张璨 《特钢技术》2013,(1):19-22,26
马氏体时效钢是依靠马氏体强化和经时效在马氏体内析出金属间化合物的第二相强化而获得超高强度的钢。本文研究了15Ni马氏体时效工具钢的化学成分、经816℃×2h油冷的固溶处理以及480℃×2h时效处理后的显微组织和热处理硬度。对15Ni马氏体时效工具钢的合金化特点进行了初步的分析讨论。  相似文献   

10.
正北京科技大学吕昭平教授团队研发出一种新型纳米强化的超高强马氏体时效钢。这种钢材不但成本降低,生产工艺简单,而且抗拉强度较高。据吕昭平教授介绍,在航空航天、新能源、先进装备制造、国防安全和高速列车等国家重大高新技术领域,高端的超高强钢均有重大需求。钢铁材料的强者是马氏体时效钢,主要在于这种钢铁材料中含有大量的钴、钛和钼等贵重合金元素,还要经过复杂苛刻而严格的冶炼和热处理工艺,所以价格昂  相似文献   

11.
The age hardening kinetics in the temperature range of 713 to 813 K of a 2400 MPa grade cobalt-free maraging steel (Fe-(18.8 ∼ 19.1) pct Ni-(4.4 ∼ 5.4) pct Mo-2.6 pct Ti, wt pct) has been studied. Study of microstructure and mechanical properties showed that a high number of Ni3Ti and Fe2(Mo,Ti) precipitates were formed during the ageing process, which resulted in high strength and relatively low fracture toughness. Ni3Ti was the main precipitation phase. Fractography has shown ductile failure of tensile and fracture toughness specimens. Thermodynamic calculations showed that the equilibrium phases are Ni3Ti, Fe2(Mo,Ti), ferrite, and austenite.  相似文献   

12.
研究了不同的热处理工艺后18Ni(300)马氏体时效铜棒的晶粒度水平,以及在满足技术标准条件下的拉伸性能与晶粒度的关系,找到了获得满足技术标准要求的晶粒度与拉伸性能的18Ni(300)Zh氏体时效钢棒(规格:直径φ≤100mm)的最佳热处理工艺。  相似文献   

13.
唐愈 《粉末冶金技术》2021,39(3):280-286
针对我国钴资源稀缺及传统WC–Co硬质合金在腐蚀介质与高温环境下应用所存在的缺陷,总结了一系列性能良好的少钴/无钴WC材料,包括以其他金属或金属间化合物替代Co作为粘结剂的WC硬质合金,不添加任何粘结剂的纯WC材料以及由陶瓷相增强的WC复合材料,讨论了少钴/无钴WC材料的优缺点,并展望了其发展趋势。  相似文献   

14.
T250马氏体时效钢晶粒尺寸对时效析出的影响   总被引:1,自引:0,他引:1  
 在840 ℃ 1 h固溶退火+480 ℃ 4 h时效处理条件下,不同晶粒度的T250马氏体时效钢力学性能比较试验表明,材料的性能和晶粒尺寸关系并不表现出明显的依存关系。相应的XRD和显微结构比较研究显示,马氏体时效钢的时效行为和晶粒尺寸相关。晶粒细小的马氏体钢时效时形成更多体积分数的逆转奥氏体,以膜状分布在晶界和亚晶界起到软化作用而有利于材料塑韧性的提高;同时产生更为细小弥散的沉淀相起到更为明显的强化作用。这可能是材料的力学性能和晶粒尺寸关系不明显的组织结构原因。  相似文献   

15.
The present work deals with the ultra-high strength maraging steels, which are exotic materials used for high tech applications in aerospace and nuclear fields. Masking of a fabrication defect in a critical component by filling it with cheap mildsteel weldment to avoid rejection on visual inspection may lead to catastrophic failure when put into service. This paper is aimed to simulate formation of such a defect in a maraging steel rod and to analyse the probable metallurgical reasons leading to its premature failure using optical and scanning electron microscopy and energy dispersive spectroscopy.  相似文献   

16.
The 18Ni 300 grade cobalt-free maraging steel T300 was successfully manufactured on an industrial scale by application of vacuum induction melting (VIM) and vacuum arc remelting (VAR) process at Baosteel.With the content of O and N less than 15 ppm and 10 ppm respectively (1 ppm=10-6),the T300 steel produced by Baosteel obtained a high degree of purity and a good combination of ultra-high strength and fracture toughness.The effects of solution temperature and ageing temperature on tensile property of solution-treated and aged T300 steel were investigated.The results show that the solution temperature slightly influences the strength of the solution-treated steel,indicating that the solution strengthening rather than the grain boundary strengthening is more important to the solution-treated steel.For the solution-treated T300,the elongation and reduction of area don’t change much with a rising solution temperature,and remain above 17% and 70% respectively at the solution temperature ranging from 800℃ to 1200℃.For the aged T300 steel,the strength and elongation are reduced with an increasing solution temperature,and the solution temperature has a greater effect on the reduction of area than that on the elongation.The reduction of area of the aged steel reaches a high peak when the solution temperature reaches 920℃.The experimental data indicates that precipitation strengthening makes a contribution of 1100 MPa to the tensile strength of the aged steel.The ageing temperature exerts a greater effect on the strength than on the elongation and reduction of area.The steel achieves a better combination of strength and toughness at the peak ageing temperature of 500℃.  相似文献   

17.
 研究了固溶处理温度对耐蚀马氏体时效钢力学性能的影响。研究结果表明,800℃固溶处理后的组织遗传了锻态的晶粒形态、尺寸及高密度缺陷,使固溶处理后的马氏体也具有高的缺陷密度,并增加了组织中残余/逆转变奥氏体的含量,从而使材料具有较高的强韧性。较高温度固溶处理奥氏体发生回复和再结晶,其缺陷密度的降低使最终马氏体时效强化效应下降,而且残余/逆转变奥氏体量也下降,从而使材料的韧性水平下降。该试验钢固溶处理温度低于传统的马氏体时效不锈钢的固溶处理温度。  相似文献   

18.
Fatigue crack growth rates were measured in an annealed and in an aged maraging steel and in three different austenitic steels. Microhardness measurements were used to determine the plane strain plastic zone sizes as a function of ΔK and to evaluate the cyclic flow stress of the material near the crack tip. The presence of a reversed cyclic plastic zone within the monotonic plastic zone was confirmed. The two maraging steels work soften near the tip of the crack while the three austenitic steels work harden. The fatigue crack growth rates of the maraging steels are independent of the monotonic yield stress and are typical of the growth rates of steels with a bcc crystal structure. The crack growth rates in the stainless steels are an order of magnitude lower than for maraging steels for ΔK< 30 ksi √in. The excellent fatigue crack growth resistance of austenitic stainless steels is related to the de-formation induced phase transformations taking place in the plastic zone and to the low stacking fault energy of the alloys.  相似文献   

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