【作者】 杨鹏宇；

【导师】 苗德华； 呼英俊；

【作者基本信息】 天津科技大学 ， 机械设计及理论， 2006， 硕士

【摘要】 钛合金材料具有密度小，强度高，比强度大，热强性高，热稳定性好，化学活性大，导热性差，弹性模量低，抗腐蚀性能好等特点。随着对钛合金性能要求的不断提高，在改进冶炼工艺之外，还要应用热处理工艺以改善其性能。但是，经低温退火及时效处理的材料强度和硬度均很高，采用标准试件不能测出材料真实的力学性能。为此，本文以降低实验材料的消耗量、提高实验数据的可靠性为目标，应用有限元软件进行数值分析和实验验证，设计出结构参数和应力分布合理的专用拉伸试件。 探讨了低温退火温度和保温时间与材料强度、塑性的关系，在此基础上进一步研究了淬火后再进行时效处理对材料力学性能的影响。实验表明：当退火温度为460℃时，其强度极限值最大；780℃冰水淬火后再进行480℃时效处理5h，材料的强度较高、塑性较好，是较理想的热处理条件。 通过对典型断口组织、金相组织及X射线衍射特征进行全面的观察与分析，考察了低温退火及淬火后再进行时效处理对材料力学性能影响的机理，为进一步改善材料的性能提供了依据。更多还原

【Abstract】 Titanium alloy material have density to be little, the intensity is high , it is hot and strong and high, hot stability is good, the chemical activity is great, the heat conductivity is bad, the modulus of elasticity is low, anticorrosive of good performance characteristic. With the constant improvement to that titanium alloy performance required, except craft of smelting of improvement, employ the heat treatment craft in order to improve its performance . But through anneal material that result deal with intensity and hardness very high in time at low temperature, adopt standard try on one be unable to measure the actual mechanics performance of material. For this reason, this text regards reducing the consumption of the experiment material , dependability of raising the experimental data as the goal, employ finite element software carry on number value analysis with experiment prove , design structural parameter and stress distribute reasonable special-purpose draw try one.It have probed into temperature and relation of temperature retention time , material intensity , plasticity of annealing at low temperature, have further studied and quenched, carried on prescription and handled the impact on performance of mechanics of materials on this basis. The experiment shows : Temperature is at the time of 460 ℃as annealing, its intensity is the largest in extreme ; Carry on 480 ℃ prescription and deal with 5h after 780 ℃ frozen water is quenched, the intensity of the material is higher, plasticity is better, it is a more ideal heat treatment condition .更多还原