共查询到19条相似文献,搜索用时 93 毫秒
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马氏体不锈钢成分、工艺和耐蚀性的进展 总被引:5,自引:0,他引:5
介绍了马氏体铬不锈钢、马氏体铬镍不锈钢和马氏体时效不锈钢的进展和发展动态,讨论了化学成分、热加工、热处理工艺对马氏体不锈钢组织和耐蚀性的影响.当前国内开发的新型马氏体不锈钢主要为符合给定服役条件的专用钢类.优化化学成分,提高钢的纯净度,通过热加工和热处理工艺控制钢的组织,进行表面处理是提高屿氏体不锈钢耐蚀性的有效途径. 相似文献
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本文对不同固溶和时效温度下的0Cr15Ni5Cu2Ti马氏体不锈钢组织及性能进行分析,以此确定该钢的热处理工艺,同时对该钢的强化机理进行分析。 相似文献
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运用拉伸试验,金相组织分析等方法研究了合金元素钛含量对00Cr13Ni8Mo2TiNbAl马氏体时效不锈钢机械性能的影响。研究发现,钛含量增加,使钢中获得细小沉淀物的弥散分布,细化晶粒,增强时效硬化,从而提高该钢的抗拉强度。 相似文献
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美国卡彭特(Carpenter)技术公司研制了一种优质熔炼的马氏体时效硬化钢,与该公司开发的其它高强度、沉淀硬化不锈钢相比,它对加工参数没有那么敏感。据说,Custom465不锈钢是当今市场上所见PH不锈钢中拥有强度、断裂韧性最佳结合的钢种。 相似文献
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《不锈(市场与信息)》2008,(7):8
美国卡彭特(Carpenter)技术公司研制了一种优质熔炼的马氏体时效硬化钢,与该公司开发的其他高强度、沉淀硬化不锈钢相比,它对加工参数没有那么敏感。据说Custom465不锈钢是当今市场上所见PH不锈钢中拥有强度、断裂韧性最佳的钢种。 相似文献
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《特殊钢》2016,(4)
采用动电位极化曲线、均匀腐蚀全浸试验研究了50 kg真空感应炉冶炼的00Cr13Ni7Co5Mo4W马氏体时效不锈钢(/%:0.007C,13.23Cr,7.02 Ni,5.06Co,3.72Mo,0.96W)1100℃1 h固溶,450~510℃8 h时效后的耐蚀性能,通过金相显微镜、透射电镜、XRD分析了马氏体时效不锈钢的组织。结果表明,随时效温度升高时效过程析出R相增加,导致钢的耐点腐蚀性下降,同时由马氏体逆转变的奥氏体数量增加,可改善该钢的耐腐蚀性能。00Cr13Ni7Co5Mo4W马氏体时效不锈钢适宜的热处理工艺为1100℃1 h固溶+470℃8 h时效,其年腐蚀速率为1.259 0μm/a,点蚀击穿电位为252 mV。 相似文献
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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
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研究了00Cr13Ni7Co5Mo4Ti马氏体时效不锈钢(/%:0.009C、13.28Cr、7.37Ni、5.36Co、3 59Mo、0.66Ti)经4次860℃15 min水冷循环处理的细化晶粒工艺对力学性能的影响。以1 100℃1 h固溶处理的组织为原始组织,经3~4次循环相变处理后,马氏体时效不锈钢的晶粒尺寸由180μm细化至10μm的细小等轴晶粒。与传统1 100℃1 h固溶+450℃9 h时效工艺相比,经1 100℃1 h固溶+860℃15 min水冷α′(?)γ循环相变+450℃9 h时效的钢的屈服强度σ0.2由1 420 MPa提高至1 560 MPa,伸长率δ由12.6%提高至14.9%。 相似文献
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Microstructure and mechanical properties were studied in CORRAX maraging steel during prolonged ageing up to 300 h at 798 K. Strengthening of maraging steel was caused by the formation of an intermetallic phase enriched in Ni and Al which exhibits an ordered B2 (CsCl) superlattice structure. Precipitation hardening was accompanied by an increase in micro‐hardness with peak hardness after about 12 h of ageing. After 300 h of ageing, the micro‐hardness value is still high, corresponding to 94% of the peak hardness. The reverse transformation of martensite to austenite does not take place during prolonged ageing as shown by X‐ray and electron backscatter diffraction analyses. The experimentally determined amount of austenite (1‐2 vol.%) is in good agreement with the calculated value (about 2.5 vol.%). 相似文献
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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
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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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R. Chait 《Metallurgical and Materials Transactions B》1972,3(2):369-375
Room temperature tensile and compressive true stress-true strain curves of various high strength steels (quenched and tempered
4340 steel, 410 martensitic stainless steel, and H-11 steel; and aged 300-grade 18 Ni maraging steel) were analyzed to determine
the effect of the various microstructures, on what has been termed the strength differential (SD),i.e., the strength level difference between the tensile and compressive flow curves. Care was taken to insure that the compressive
deformation was homogeneous. Regardless of the amount of plastic deformation, the quenched and tempered steels exhibited a
higher flow stress in homogeneous compressive deformation than for tensile deformation. The extent of the SD was dependent
on tempering temperature. This observation is consistent with what others have observed regarding yield strength behavior
of quenched and quenched-and-tempered steels. Despite the low carbon content, aged maraging steel also showed a greater resistance
to homogeneous compressive deformation. Metallographic examination of the maraging steel revealed the banding that is indicative
of segregation. However, homogenization had little effect on the SD despite a change in austenite grain size, reverted austenite
content, and the austenite-to-martensite transformational strains shown by Goldberg to be present in segregated material. 相似文献