共查询到19条相似文献,搜索用时 78 毫秒
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采用几种不同的热处理工艺对超高碳钢进行球化处理,并对不同热处理状态下的试样进行了组织观察和力学性能测试分析,探讨了热处理对超高碳钢组织和性能的影响。结果表明,随着碳化物球化率的提高,钢的塑性得到明显改善。经840℃×20min淬火+650℃×3h高温回火处理样品因能获得圆整度高的球状碳化物,而拥有σs=576MPa、σb=835MPa的高强度和δ5=18·4%的良好塑性。经1200℃×4h高温正火+800℃×2h球化退火处理的超高碳钢由于获得的球状碳化物颗粒细小且分布均匀,基体在变形时受到的阻碍作用较弱,故强度较高(σs=622MPa,σb=927MPa),但塑性稍有下降(δ5=16·0%)。经720℃×3·5h退火处理和840℃×20min空冷+720℃×2·5h退火处理的超高碳钢尽管含有一定量的片状碳化物,也能获得高的强度(σs>590MPa,σb>870MPa)和较好的塑性(δ>11%)。 相似文献
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利用离异共析原理,采用不同的热处理工艺球化热轧超高碳钢。组织观察表明:热轧预处理消除了铸态下晶界网状粗大碳化物,并获得颗粒状碳化物与片状珠光体的混合组织。球化热处理时,奥氏体化温度升高、保温时间延长,碳化物颗粒的间距增大,减缓冷却速率增加碳化物的析出。对球化后超高碳钢进行拉伸力学性能试验,850℃球化后的强度很高(σ0.2=688.71MPa,σb=1005.78MPa),屈强比和伸长率分别为0.69、16.7%。拉伸后的断口形貌分析表明,超高碳钢拉伸过程中裂纹易在大颗粒碳化物处萌生、扩展。 相似文献
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球化工艺对热轧超高碳钢组织性能的影响 总被引:1,自引:0,他引:1
利用离异共析原理,采用不同的热处理工艺球化热轧超高碳钢。组织观察表明:热轧预处理消除了铸态下晶界网状粗大碳化物,并获得颗粒状碳化物与片状珠光体的混合组织。球化热处理时,奥氏体化温度升高、保温时间延长,碳化物颗粒的间距增大,减缓冷却速率增加碳化物的析出。对球化后超高碳钢进行拉伸力学性能试验,850℃球化后的强度很高(σ0.2=688.71MPa,σb=1005.78MPa),屈强比和伸长率分别为0.69、16.7%。拉伸后的断口形貌分析表明,超高碳钢拉伸过程中裂纹易在大颗粒碳化物处萌生、扩展。 相似文献
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讨论了T12A钢制锉刀中碳化物粒子大小,形状及马氏体形态对锉刀使用寿命的影响。结果表明:适当粗化并尽量球化原始组织中的碳化物粒子,可增加淬火组织中板条马氏量与未溶碳化物的体积分数,从而显著提高锉刀韧性并延长其使用寿命。 相似文献
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通过细化碳化物获得优良性能的超高碳钢.结果表明,显微组织中除了珠光体和晶界上的网状碳化物外,还有约6.5%的球状石墨.由于少量球状石墨的存在,经850℃×3h球化退火处理后的钢表现出良好的塑性,伸长率达12.5%,且抗拉强度达967 MPa、屈服强度达715 MPa. 相似文献
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Pei Wang Sijie Yu Jaskarn Shergill Anil Chaubey Jü rgen Eckert Konda Gokuldoss Prashanth Sergio Scudino 《金属学报(英文版)》2022,35(3):389
Al-7Si-0.5 Mg-0.5Cu alloy specimens have been fabricated by selective laser melting (SLM). In this study, the effects of solution treatment, quenching, and artificial aging on the microstructural evolution, as well as mechanical and wear properties, have been investigated. The as-prepared samples show a heterogeneous cellular microstructure with two different cell sizes composed of α-Al and Si phases. After solution-treated and quenched (SQ) heat treatment, the cellular microstructure disappears, and coarse and lumpy Si phase precipitates and a rectangular Cu-rich phase were observed. Subsequent aging after solution-treated and quenched (SQA) heat treatment causes the formation of nanosized Cu-rich precipitates. The as-prepared SLMs sample has good mechanical properties and wear resistance (compressive yield strength: 215 ± 6 MPa and wear rate 2 × 10-13 m3/m). The SQ samples with lumpy Si particles have the lowest strength of 167 ± 13 MPa and the highest wear rate of 6.18 × 10-13 m3/m. The formation of nanosized Cu-rich precipitates in the SQA samples leads to the highest compressive yield strength of 233 ± 6 MPa and a good wear rate of 5.06 × 10-13 m3/m. 相似文献
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研究了热处理条件对锻态2.5vol.%(TiB TiC)/Ti复合材料显微组织和力学性能的影响。结果表明:固溶时效处理对复合材料的基体组织特征有显著影响,在两相区进行固溶时效处理后,得到等轴和双态组织,随固溶温度的升高,初生α相含量逐渐降低,而β转变组织含量逐渐升高,当固溶温度超过β转变温度时,得到全片层组织。TiB和TiC增强相在热处理过程中较为稳定,形态与分布无明显变化。固溶时效处理后,锻态复合材料的拉伸强度提高而塑性降低,随固溶温度的升高,复合材料的室温拉伸强度和塑性均有明显增加,而650 oC下拉伸强度与塑性与室温下表现出相反的规律。复合材料经1050oC/2h/AC 600oC/6h/AC处理后综合性能最好,室温拉伸强度为1215.8MPa,延伸率为3.14%,650 oC下拉伸强度为629.9MPa,延伸率为15.9%。 相似文献
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M718 alloy with an extra high Mo content of 7.50 wt% which reduced Nb addition and increased Al and Ti additions within the composition specifications of 718 alloy has been designed to increase the service temperature of 718 alloy. And the effect of the heat treatment on the microstructure and mechanical properties of M718 alloy has been investigated in this study. The results showed that Laves phase precipitated on the grain boundaries of M718 alloy instead of d-Ni_3 Nb phase in718 alloy, and y'and y'phases precipitated in the matrix of M718 alloy as that in 718 alloy. Increasing the solution temperature from 960 to 1050 ℃ noticeably reduced the intergranular precipitation of Laves phase. The precipitation of Laves phase was appropriate at 1020 ℃ for improving the grain boundary cohesion. Increasing the two-stage aging temperatures markedly increased the sizes of y' andy'phases. As a result, the strength of M718 alloy increased. 相似文献
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In order to simulate the hot-dipped galvanizing of dual-phase(DP) steel(wt%) 0.15C–0.1Si–1.7Mn, the DP steels were obtained by different annealing schedules. The effects of soaking temperature, time, and cooling rate on ferrite grain, volume fraction of martensite, and the fine structure of martensite were studied. Results showed that the yield strength(YS) of DP steel is sensitive to annealing schedule, while total elongation has no noticeable dependence on annealing schedule. Increasing soaking temperature from 790 to 850 °C, the YS is the lowest at soaking temperature of 850 °C. Changing CR1 from 6 to 24 °C/s, the YS is the highest when CR1 is 12 °C/s. Increasing soaking time from 30 to100 s, the YS is the lowest at soaking time of 100 s. Besides, it was found that sufficient movable dislocations within ferrite grains and high martensite volume fraction can eliminate yield point elongation, decrease the YS, and increase ultimate tensile strength. Through TEM observations, it was also found that increasing annealing temperature promotes austenite transformation into twin martensite, and increases volume fraction of martensite at sufficient cooling rate. With increasing the martensite volume fraction, the deformation substructure in the ferrite is well developed. 相似文献
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热处理对超(超)临界材料组织性能的影响 总被引:1,自引:0,他引:1
选用2Cr11Mo1VNbN、10Cr9W2MoVNbNB、1Cr11Co3W3NiMoVNbNB 3种超(超)临界机组耐热材料,进行热处理工艺、力学性能、金相组织研究.通过实验确定了3种材料最合适的热处理工艺参数:2Cr11Mo1VNbN、10Cr9W2MoVNbNB钢的最佳淬火、回火温度分别为1 060~1 080℃、660~680℃;1Cr11Co3W3NiMoVNbNB钢的最佳淬火、回火温度分别为1080~1 100℃、680~700℃;观察分析发现,3种钢在1 080℃淬火、680℃左右回火的组织均为回火马氏体;找出了材料热处理后的强度与冲击韧度之间的关系. 相似文献
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本文研究了具有双态组织的钛合金Ti-6Al-4V-0.55Fe(TC4-0.55Fe)在不同热处理制度(固溶时效、双重退火)和引入预拉伸对微观组织及力学性能的影响,并分析了合金显微组织与力学性能之间的联系。通过对双态组织的 TC4-0.55Fe采用固溶时效和双重退火热处理后微观组织和力学性能进行比较,发现两种热处理方式下随着时效和低温退火温度升高合金中微米级的片层α相厚度均逐渐增大、强度降低、塑性提高。固溶时效热处理下随着时效温度的升高合金屈服强度从530℃的873MPa下降到590℃的862MPa,而延伸率提高3.2%。双重退火热处理试样的屈服强度随着低温退火温度的升高逐步降低,但是延伸率相比于固溶时效有了很大提高,最好可达到23.6%。由于普通热处理对钛合金强度提升不明显,时效和低温退火温度均为590℃时,双重退火试样塑性更优于固溶时效,所以选择该试样引入预拉伸强化,对其在固溶和低温退火中间进行预拉伸。引入预拉伸后,晶粒发生了明显的变形,进行时效强化后合金组织无沉淀区(PFZ)中析出大量细小的二次α相(αs),引入预拉伸后进行时效可以在提升钛合金屈服强度的同时只降低极少的塑性,其中预拉伸形变1%的试样等轴晶含量最高,强度较引入预拉伸前提高68MPa,延伸率仅下降4%,力学性能最优。通过本文研究可知,TC4-0.55Fe钛合金在经过固溶处理后继续进行预拉伸和时效处理,可以有效提升合金的综合力学性能。 相似文献