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本文对研制生产的H13钢(即4Cr5MoSiV1钢),在单纯拔长热锻工艺下,不同锻造对模具钢性能的影响;研究得出,最佳锻造比为6,此时常温横向冲击韧性达45.0J/cm^2横纵向冲击韧比达0.92-1。其高温冲击韧性及高温屈服强度明显高于国内外同类H13钢。 相似文献
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稀土对耐热钢高温性能的影响 总被引:2,自引:0,他引:2
通过对真空持久试样断口表面的离子探针分析,证明稀土偏聚晶界,增加了晶界的强度,改善了钢的热强性和热塑性。用同位素方法试验表明,稀土提高了钢中铬的扩散速度,促进了Cr_2O_3保护膜的形成。用SEM、EDEX、ICP及X光等方法对合金表面氧化皮进行的研究表明,钢中加入稀土改变了氧化皮结构,细化了晶粒,抑制或延缓了氧化皮与基体界面空洞的形成,使氧化皮不易开裂和脱落,改善了钢抗氧化性。 相似文献
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《中国钨业》2016,(3):63-67
稀土掺杂可提高钼合金的强度,试验通过固-液纳米掺杂获得不同含量的Mo-La、Mo-Y、Mo-Ce复合粉末,经过相同的压制、烧结、拉丝工艺制备了直径为1.8 mm三种不同稀土掺杂钼合金丝。通过对钼合金丝室温及1 500℃高温力学性能检测,结合金相及透射电镜分析,研究了不同稀土元素对钼合金丝力学性能的影响,分析其强韧化机制。结果表明:由于Ce O_2在钼合金丝加工过程中与钼基体一同产生了形变,由此产生的韧化效果,使得钼合金丝表现出更为优异的力学性能;而La_2O_3与Y2O_3在加工过程中并未发生变形,主要起到弥散强化的作用;纳米La_2O_3因其颗粒分布更为细小均匀,使得La_2O_3掺杂比Y2O_3掺杂的钼合金丝表现出相对高的综合力学性能。 相似文献
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稀土在金刚石圆锯片节块烧结中的作用 总被引:11,自引:2,他引:9
本文从胎体对金刚石的把持力、烧结对金刚石性能以及胎体的机械性能的影响等方面探讨了稀土对金刚石节块烧结性能的影响。实验结果表明,由于稀土的加入,起到活化烧结和类似预氧化烧结的目的,使得加入该元素的金刚石节块在锯切中的使用寿命得到显著提高,该元素在组合锯节块烧结中的作用尤为重要。 相似文献
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试验的含Ce新型616钢(/%:0.23~0.25C,0.73~0.78Si,1.64~1.70Mn,0.003~0.005S,0.016~0.020P,0.051~0.061 Ti,0.026~0.028Nb,0.0020~0.0030B,0~0.302Ce)由10 kg真空感应炉熔炼,轧成5 mm厚钢板,并经900℃水淬,600℃回火。通过万能试验机、金相显微镜、扫描电子显微镜等实验仪器研究了钢中Ce含量对616钢板的组织及力学性能的影响。结果表明,当Ce含量在0.096%时,616钢板晶粒细化明显,钢中硫化物由长条状转变为球状,可提高钢板的抗拉强度和韧性,含0.096%Ce板的抗拉强度从未加稀土的681 MPa提高至779 MPa;再增加Ce含量,钢板进一步细化不明显,钢中夹杂物增多,当含Ce 0.302%时,钢板的抗拉强度降至712 MPa。 相似文献
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The effects of REinsteel include cleaning,mod-ifyinginclusions and alloying[1 ~4]. With the develop-ment of steel-making and continuous casting process-ing,the fluctuation range of the composition of steelwas mini mized ,the cleanliness of steel was i mpr… 相似文献
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Single-pass friction stir processing (FSP) was used to increase the mechanical properties of a cast Mg-Zn-Zr-rare earth (RE)
alloy, Elektron 21. A fine grain size was achieved through intense plastic deformation and the control of heat input during
processing. The effects of processing and heat treatment on the mechanical and microstructural properties were evaluated.
An aging treatment of 16 hours at 200 °C resulted in a 0.2 pct proof stress of 275 MPa in the FSP material, a 61 pct improvement
over the cast + T6 condition. 相似文献
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Effect of Rare Earth Composite Modification on Microstructure and Properties of a New Cast Hot-Work Die Steel 总被引:5,自引:0,他引:5
The effects of RE modification on structure and the properties of a new cast hot-work die (CHD) steel were investigated. The grains of the CHD steel are refined by RE modification. With the increase of RE addition, both grain size and inclusion amount are reduced. Appropriate amount of RE results in decrease in inclusion amount and formation of spheroidal inclusions uniformly - distributed in steel, so that the morphology and distribution of inclusions are improved. RE composite modification favors the formation of bainite, austenite and fine lath martensite with dense dislocation. When the residual RE content reaches 0.02 %, no obvious changes in strength and hardness are found, while fracture toughness and threshold of fatigue crack growth are increased. The impact toughness, elongation and reduction of cross sectional area are increased by a factor of two, and thermal fatigue resistance is also improved. 相似文献
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A technique of treating steel with rare earth fluoride complex additives(REFCA),effects andinflunce factors have been studied.REFCA play a role on controlling inclusion morphology,purifying themolten steel and improving properties of steel.The optimum composition of REFCA is REF_3 42%;CaO33%;SiCa 25%,and the amount of REF_3 is 0.5 wt%~0.6 wt% of steel. 相似文献
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稀土对高速钢堆焊层组织与性能的影响 总被引:1,自引:0,他引:1
本文研究了稀土合金对高速钢W_(18)Cr_4V堆焊层微观组织,力学性能和耐磨性的影响。结果表明,在焊条药皮中加入适量的稀土合金,在焊态下能使高速钢堆焊金属中的共晶碳化物由连续网状,粗大骨骼状(莱氏体)转变成孤立、细小的不规则块状;冲击韧性提高152%,耐磨性提高47~109%。并对稀土所起的作用进行了分析讨论。 相似文献
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