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Effect of heat treatment on microstructure and properties of hot-extruded nickel-aluminum bronze 总被引:1,自引:0,他引:1
The effect of heat treatment on the microstructure and properties of a hot-extruded nickel-aluminum bronze was investigated. Experimental materials were heat treated through different processes, including quenching, normalizing, aging and annealing, and their microstructure, corrosion resistance and mechanical properties were characterized. It is found that quenching causes all β phase transformed into β phase, however, normalizing causes β phase transformed into β α and κ phases. When the quenched sample is aged, fine phase is precipitated from the as-quenched microstructure of β' phase. Annealing causes the transformation of β into a and κ phases. The results of mechanical property tests show that quenching, normalizing and aging improve the tensile strength and hardness of the experimental material, with a corresponding fall in elongation. Annealing raises the elongation but reduces the tensile strength and hardness. Furthermore, corrosion resistance of nickel-aluminum bronze ranks from worse to better in the following order: aged, quenched, normalized, hot-extruded and annealed. However, with the exposure time of corrosion test increasing, the difference of average corrosion rate between those nickel-aluminum bronzes tums small. 相似文献
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由于煤田地理环境的复杂性,在对其进行开采使用过程中随时都可能发生安全事故。增强对煤田地质安全生产的管理对于煤矿生产相关企业是至关重的。而科学合理的生产管理方式可以保障煤田安全性生产的重保障,也是避免职工重大伤亡事件发生的先决性条件。本文对于煤田的生产现状和事故多发因素及对其的安全生产管理对策进行了探讨。 相似文献
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通过对旁路微氧污泥减量技术中好氧污泥在微氧池中的减量效果及其影响因素的研究,发现污泥减量效果与微氧池的污泥浓度(MLSS)、好氧污泥与厌氧污泥的比例(α)、微氧池的氧化还原电位(ORP)、微氧池的污泥停留时间有关。当微氧池的α=2∶8、MLSS为10 000 mg/L时,减量效果最佳;通过不同MLSS和不同α值两组试验,得出在最佳值时的减量率分别为19.15%和19.61%。低ORP值条件下微氧池污泥颗粒细碎,中位粒径为20.24μm,而好氧污泥的中位粒径为32.18μm。同时,混合液中溶解性大分子有机物含量明显增加。该工艺使污泥有更充分的时间进行内源呼吸和EPS的离解释放,从而实现了污泥减量。 相似文献
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摘要在国内的各大城市,酒店住宿这一行业得到了极大的蓬勃发展,其中,特别是以连锁为主的酒店经营模式,通过将经济性较强的酒店服务与连锁性强的经营理念相结合,成功地推动了酒店行业的服务灵活性与可持续性。另外,对于经济型酒店在连锁经济管理方面所具有的独特理念与模式,由于其成本小、风险小同时发展快等显著优势,以及在国内所拥有的庞大客户数量群体,已然成为了第三产业最具发展前景的行业。而本文主要针对了我国目前绝大部分经济型酒店,对其管理的理念及模式进行了初步探讨和研究,并提出了相关观点。 相似文献
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