共查询到20条相似文献,搜索用时 109 毫秒
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用脱稳-渗硼或脱稳-渗钒热处理提高高铬铸铁耐磨性 总被引:1,自引:0,他引:1
研究了高铬铸铁脱稳-渗硼和脱稳-渗钒热处理工艺、组织及性能。粘着磨损及磨料磨损耐磨性试验表明,高铬铸铁经脱稳-渗硼、脱稳-渗钒处理后,具有比普通脱稳处理工艺高得多的抗磨能力。 相似文献
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在自行研制的腐蚀磨损试验机上,研究了腐蚀学因素对化学镀Ni-P合金腐蚀磨损行为的影响。结果表明,当NaCl浓度为3.5%时,化学镀Ni-P合金的腐蚀磨损速率、摩擦系数和腐蚀磨损协同作用率具有峰值特性。NaCl浓度升高将引起Ni-P合金的自腐蚀电位负移,温度升高将引起Ni-P合金的腐蚀磨损速率增大,协同作用率上升。化学镀Ni-P合金可以作为G105钢在NaCl溶液中抵抗腐蚀磨损的表面改性材料。 相似文献
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HIT-TMS-100型刀具破损监控系统的研制 总被引:2,自引:0,他引:2
HIT-TMS-100型刀具破损监控系统的研制哈尔滨工业大学姚英学,王东鹏,袁哲俊主题词:刀具破损,监控1概述在柔性制造系统的各个环节中,刀具的一稳定性、一致性最差,工作环境最恶劣,极易损坏。一旦刀具发生磨损和破损等异常状态而不能及时检出,会导致工件... 相似文献
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不论镀态下的化学镀Ni-B合金是晶态或非晶态,加热时都会析出Ni_3B相。经低温处理的镀层硬度高、脆性大,磨损严重,磨损机理为剥落和磨粒磨损。经高温处理的镀层硬度较低,磨损量较小,为粘着和磨粒磨损。加热温度为500℃时,硬度和延展性达到良好配合,耐磨性最好,为单一的磨粒磨损。 相似文献
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此文研究了新型陶瓷刀具JX-2(JX-2-Ⅰ和JX-2-Ⅱ)切削不锈钢(1Cr18Ni9Ti)时的切削性能,并同JX-1刀具进行了比较,结果表明,其抗磨损能力次序为:JX-2-Ⅲ>JX-2-1>JX-1,但JX-2-1和JX-1的磨损相差不大;同时研究了切削速度v和送给量f,对JX-2-Ⅰ刀具磨损的影响,发现u=20m/min,f=0.15~0.25mm/r时刀具磨损最小;SEM分析表明,刀具的主要失效形式为后刀面磨损、前刀面月牙洼磨损和刀刃微崩,刀具磨损的主要讲理是粘结磨损和磨粒磨损。 相似文献
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董建业 《锻压装备与制造技术》1995,(1)
JA31-160B压力机控制系统的改进与修复JA31-160B压力机的控制系统存在一些问题。它的空气分配阀阀芯的压下动作是由MQ1-8Z牵引铁来完成的,所使用的电压是380V,极不安全;由于长期工作,空气分配阀部分已严重磨损,阀体与阀芯间隙已经达到0... 相似文献
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研究了添加不同量的Li对Al-Mg-Ag-Zr合金时效组织和机械性能的影响。通过时效硬度、拉伸强度和延伸率的测试,以及x射线衍射分析和TEM观察,证明在Al-Mg-Ag-Zr合金中加入Li可使合金得到显著的时效硬化和强化,但仅当Li的含量在1.75%时,该合金才具有优良的综合力学性能;在含Li量较低的Al-Mg-Li-Ag-Zr合金中可生成T相,且T相的生成有利于该合金综合性能的提高。 相似文献
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铸态奥氏体-贝氏体耐磨钢的研究 总被引:1,自引:1,他引:1
以硅、锰为主,研制了一类新型中碳低合金耐磨钢即铸态奥氏体-贝氏体耐磨钢.其特点是铸态下获得奥氏体、贝氏体为主的混合组织,具有高硬度(40~58HRC)、高韧性(αk≥15~45J/cm2)、优异的抗磨料磨损性能,铸态下使用不需重新热处理.奥氏体-贝氏体耐磨钢是传统奥氏体高锰钢的理想替代新材料. 相似文献
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(Ti0.5,W0.5)C-15 wt%Co cermets containing Mo2C were prepared and used for cutting tool inserts. The microstructure and mechanical properties were characterized, and cutting wear was compared during machining VDEH 90CrSi5 alloy steel. Tool wear mechanism was analyzed by SEM and EDS. The Mo2C-added inserts possess refined ceramic grains and solid-solution strengthened binder, and further they have higher coercive force, hardness, fracture toughness, and transverse rupture strength. Owing to these factors, obvious superiority for them is displayed on the flank wear over non-Mo2C one in continuously machining VDEH 90CrSi5 alloy steel. It is also found that wearing of the inserts is the integrated results of abrasive wearing, adhesive wearing, oxidative wearing and diffusive wearing. After introducing Mo2C to the inserts, the abrasive wear resistance, adhesive wearing and diffusive wearing are all hindered effectively, still oxidative wearing is not reduced yet. 相似文献
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To improve the wear resistance of cast Al-17Si-5Cu alloy (AR alloy), isothermal heat treatment is employed to modify the morphology of Si particles (particularly eutectic Si particles). Furthermore, wear behaviour of heat-treated alloy (HT alloy) along with AR alloy is studied using a pin-on-disc tribometer. Worn surfaces are then characterised using scanning electron microscope. The result reveals considerable microstructural modifications after the heat treatment. Accordingly, higher hardness value in HT alloy is obtained compared with AR alloy. The overall wear rate for HT alloy is found to be significantly lower compared with AR alloy at all the applied loads, indicating remarkable improvement in wear resistance. Eutectic Si particles become from acicular/rod-like to spherical/equiaxed morphology (aspect ratio close to 1) on heat treatment, resulting in good bonding with the matrix. Thus, they remain intact during wear and being harder, providing resistance to wear. Moreover, the increased hardness on heat treatment causes further resistance to wear. Therefore, the combined effect of intact harder Si particles on the wearing surface and higher hardness results in superior wear behavior in HT alloy at all loads compared with AR alloy. 相似文献
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钛合金在航空、航天工业得到了广泛应用。但其耐磨性差,对磨面容易产生粘结及对微动磨损敏感等缺点,限制其应用领域的进一步扩大,实践证明,采用电火花强化技术在TCl合金表面制造WC-8Co强化层,可以有效提高TCl基体表面耐磨性能。作者研究了WC-8Co强化层的表面状态、界面行为以及相结构组成,认为TCl合金表面强化高熔点的WC-8Co材料,厚度可大于50μm;强化层与基体之间存在过渡区;强化层表面由TiC、W2C和少量W组成;强化层截面的显微硬度是基体的3倍以上。 相似文献
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对铬锰铜合金白口铸铁的耐磨性、无磨损端面及磨损端面的微观组织、磨损形貌及硬度进行了试验和分析。铬锰铜合金白口铸铁在经过不同的热处理之后,组织发生了变化。经水冷和空冷的试样具有高耐磨性的重要原因是其在磨损过程中诱发了马氏体相变,出现加工硬化现象。 相似文献