共查询到19条相似文献,搜索用时 156 毫秒
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夏期成 《机械工人(热加工)》1989,(6)
Cr12MoV钢广泛用于制造要求耐磨性好使用寿命长的各种冷作模具,热处理工艺采用一次硬化淬火,经淬火和低温回火后具有高硬度和较好的强韧性。Cr12MoV钢是高碳高铬莱氏体钢,在退火状态存在有大量M_7C_3合金碳化物,淬火加热过程也只能部分溶解。因此,加热到淬火温度后必须有相 相似文献
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对退火态Cr12Mo1V1模具钢分别进行一次淬火+回火、双淬火+回火、一次淬火+深冷+回火、双淬火+深冷+回火等工艺处理,其中一次淬火工艺为1 030℃×0.5 h油淬,双淬火工艺为1 050℃×0.5 h油淬+1 030℃×0.5 h油淬,深冷处理工艺为-60℃×1 h+-120℃×1 h,对比研究了双淬火+深冷处理对试验钢显微组织和力学性能的影响。结果表明:与一次淬火+回火工艺相比,双淬火+回火工艺可以改善共晶碳化物分布均匀性,使碳化物形态趋于球状;增加深冷处理对改善共晶碳化物形态和均匀度的效果不明显,但可降低残余奥氏体含量。双淬火+回火工艺处理后试验钢的硬度与一次淬火+回火处理后相近,但冲击吸收能量和抗弯强度分别提升22%和12%;增加深冷处理对试验钢硬度、冲击韧性和抗弯强度影响不大。 相似文献
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夏期成 《机械工人(热加工)》1992,(6):40-42
Cr12MoV钢广泛用于制造高性能的冷作模具,要求淬火至高硬度(HRC>60)的常规工艺规定的淬火温度是1020~1040℃。为了充分发挥Cr12MoV钢的性能潜力和工艺的适用性,我们试验了Cr12MoV钢的低温淬火,该工艺能在获得高的淬火硬度的基础上提高钢的强度和韧性,改善某些工模具的使用寿命,同时有利于减小淬火变形和扩大淬火加热工艺的适用性, 相似文献
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高碳高铬钢的典型代表钢号为Cr12和Cr12MoV,这类钢含有较高的C(1.4-2.3%)和大量的Cr(11-13%),还有少量的Mo和V。这些碳化物在高温淬火时大量溶于奥氏体,增加钢的淬透性。高温回火后(500℃左右),又从马氏体中析 相似文献
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通过测定不同热处理条件下Cr12MoV钢的硬度值和残余奥氏体量,并通过金相和透射电镜观察发现.钢中的列余奥氏体和下贝氏体组织对冷作模具钢的耐磨性能有不利的影响.采用冷处理工艺可以抑制下贝氏体转变.显著提高Cr12MoV钢的硬度和耐磨性能. 相似文献
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阐述了Cr12MoV钢在制造模具过程中热处理的重要性,通过对Cr12MoV钢的锻造、锻造后的热处理及热处理前的预处理、最终热处理等方面介绍了Cr12MoV钢在制造模具时在热处理方面应注意的问题和经验,以保证Cr12MoV钢制造的模具,特别是容易变形、要求精度较高的模具热处理后能够满足模具图纸及技术需求。 相似文献
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Fatih Hayati Çakir Osman Nuri Çelik 《Journal of Mechanical Science and Technology》2017,31(7):3233-3239
Cryogenic treatment is a supplementary heat treatment usually applied after quenching. Its effects are permanent and this process affects the entire section. There have been many studies related to cryogenic treatment, most of which have been focused on tool steels. In the current study, a high-speed-train railway material was investigated, and different heat treatment processes were applied to the eutectoid steel. The effects of quenching and cryogenic treatment were investigated on the mechanical properties (toughness, hardness and wear). Four different structures were obtained with different heat treatment cycles: Pearlitic, tempered martensite, 12 hour cryo-treated tempered and 36 hour cryo-treated tempered. As a result of Charpy v-notch tests and hardness tests, cryogenic treatment was found to improve the toughness and hardness of quenched samples. The results of the ball-on-disc wear tests showed that the cryo-treated samples have better wear resistance than pearlitic and martensitic samples. 相似文献
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采用磁控溅射技术在淬火态Cr12MoV表面制备SiC/TiN、SiC/TiB2-TiN薄膜(SiC为中间层),研究TiN、TiB2-TiN薄膜的组织结构和摩擦磨损性能。结果表明,SiC薄膜与基材和TiN、TiB2-TiN薄膜间都具有明显的且呈梯度的元素扩散,界面结合良好。在水润滑条件下与钢球对摩时(载荷0.5 N,时间0.5 h),TiN薄膜、TiB2-TiN薄膜具有良好摩擦磨损性能,其平均摩擦因数分别为0.33、0.31,低于淬火态Cr12MoV的0.45,磨损速率分别为2.0×10-8和1.5×10-8mm3/(N.m),低于淬火态Cr12MoV的8.66×10-7mm3/(N.m),其中在水润滑条件下TiB2-TiN薄膜比TiN薄膜具有更好的摩擦磨损性能。 相似文献
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探讨了Cr12MoV钢硫氮碳共渗层中硫的渗入深度及渗层表面状态对摩擦系数和耐磨性的影响。 相似文献
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等离子表面钼铬共渗制备强化层的研究 总被引:1,自引:0,他引:1
利用辉光离子渗金属技术在Q235钢表面进行钼铬共渗,随后进行渗碳淬火、深冷处理及回火复合处理,对渗层组织、成分、硬度和摩擦磨损性能进行了分析。结果表明:渗层化学成分接近钼系高速钢;渗层中的碳化物细小、均匀、弥散,没有粗大的共晶莱氏体组织;经深冷2h处理试样表面硬度达到1600HV,明显高于未经深冷处理试样的表面硬度;经不同时间深冷处理试样的滑动摩擦因数基本相同,但比未经深冷处理的试样降低约15%,其相对耐磨性分另q是未渗金属试样的2.10倍和3.59倍。 相似文献
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This article presents a method for optimizing the deep cryogenic treatment (DCT) process parameters for 100Cr6 bearing steel, based on the Taguchi method with Grey relational analysis. The DCT parameters considered for the optimization included the cooling rate, soaking temperature, soaking time, and tempering temperature, with the quality targets of dimensional stability, wear resistance, and hardness. As per the Grey-Taguchi technique, nine experimental trials based on the L9 (34) orthogonal array were conducted. The optimum parameters for 100Cr6 bearing steel were arrived at based on Grey relational analysis. Analysis of variance (ANOVA) was performed and soaking temperature was identified as the most influential factor in deep cryogenic treatment of 100Cr6 bearing steel. The improvement in dimensional stability, wear resistance, and hardness of the deep cryotreated samples under optimized treatment conditions was 13.77, 49.02, and 19.35%, respectively. A microstructural examination was carried out to identify the possible mechanism of cryogenic treatment in improving the properties of the 100Cr6 bearing steel. A confirmation test was subsequently conducted to validate the test results. 相似文献
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用表面形貌仪,采用平行试验方法,研究FL150型风冷式粉碎机粉碎手机边框板在常温和低温2种条件下,不锈钢304刀具、高速钢(W18Cr4V)刀具、Cr12刀具3种材料刀具的磨损情况。结果表明该粉碎机主要粉碎形式是“磨”,主要磨损形式是磨料磨损,3种材料中Cr12刀具抗磨效果最好;手机边框板经过低温预冷后,刀具磨损加大。 相似文献
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本文对Cr12MoV模具钢TiN涂层的力学性能进行了研究。用XRD等仪器测定了TiN涂层的组织结构和显微硬度、耐磨附着力等性能。 相似文献