电渣结晶器爆炸事故原因分析

通过现场查看及对事故结晶器解剖，对发生的电渣结晶器爆炸事故，从冶炼角度进行了分析，排除了现场工艺问题及人员误操作引起事故的可能，结论是事故发生是因结晶器本身原因造成。     

DH-71型空压机运行事故分析及对策

针对唐钢氧气厂DH-71型空压机在运行中发生的2起事故，从设备本身结构及操作上入手进行分析，找出发生事故的真正原因．进而实施改进措施，杜绝了类似事故的再发生。     

地下矿山有轨运输事故原因与预防

本文介绍了地下矿山龙首矿有轨运输事故的基本类型和形式，分析了发生事故的诸多原因，提出了预防此类事故发生的具体措施。     

矿山伤亡事故分析与预防

在总结某矿山企业安全管理经验的基础上，通过对矿山因生产事故而发生伤亡人员的年龄、事故类别、事故时间、事故原因及受伤部位等方面的分析，探讨事故的发生规律，针对薄弱环节制定出相应对策，把安全工作逐步转移到“预防为主”的轨道上来，从而实现长周期安全生产。     

攀钢发电厂2#机主蒸气疏水管爆破事故分析

对主蒸气疏水管爆破事故进行了分析，结果表明：发生爆破事故的原因在于安装时错用钢材。不符合设计要求的材料在长期超高温状态下运行，珠光体发生完全球化，并产生蠕变裂纹，最终导致事故发生。     

2＃高炉炉缸冻结事故的发生及处理

介绍了2#高炉炉缸冻结事故发生的经过及处理过程，通过对事故的研究、分析、吸取经验和教训，避免在日后的操作中出现相同的事故发生。     

本钢薄板坯连铸连轧生产线卡钢、堆钢事故原因分析

针对本钢薄板坯连铸连轧生产线发生的卡钢、堆钢事故进行现场跟踪和取样分析，找出引起卡钢和堆钢事故的主要原因，通过加强设备维护、提高铸坯质量和优化生产工艺来预防卡钢事故的发生，减少由于卡钢和堆钢事故造成的经济损失。     

对一起石砌挡土墙事故的剖析

通过对一起石砌挡土墙事故的剖析，阐述了石砌挡土墙事故发生的原因，事故处理和预防的措施。     

发动机烧瓦事故原因分析

烧瓦是指发动机曲轴与支撑其转动的滑动轴承——大瓦、小瓦之间由于长时间缺油出现严重干摩擦，形成表面高温，摩擦表面发生严重粘附或转移，轴颈与瓦相互烧结咬死使相对运动停止或不能运动，致使发动机无法运转。发动机发生烧瓦事故需停机修理，维修费用较大、维修工期较长。因此，对发动机烧瓦事故的发生原因进行分析，采取相应措施预防烧瓦事故的发生是必要的。     

液氨钢瓶爆炸事故分析

分析液氨钢瓶爆炸事故的原因，指出应避免过量充装，防止类似事故发生。     

有序排布金刚石锯片的制备与磨粒磨损形态研究

采用一种新型阵列微孔吸附金刚石多层有序排布法制备了体积分数为20%的多层有序排布金刚石锯片, 对比研究了多层有序排布金刚石锯片和随机分布金刚石锯片在加工罗源红花岗岩时的锯切电流和单颗金刚石磨粒所受的切向锯切力, 对切割加工实验后锯片中金刚石磨粒不同磨损形态进行了观察和统计, 分析了金刚石有序排布对锯片切割性能及金刚石磨粒磨损特征的影响。结果表明, 阵列微孔吸附有序排布金刚石锯片的锯切电流和单颗金刚石磨粒所受的切向锯切力比磨粒随机分布锯片低; 在干切和湿切条件下, 有序排布金刚石锯片的脱落磨粒占总磨粒比率比随机分布金刚石锯片低, 宏观破碎和微破碎磨粒占总磨粒比率比随机分布金刚石锯片高。     

双切剪下剪刃轴向窜动原因分析及解决措施

针对酸洗机组双切剪下剪刃在运行过程中频繁窜出的问题,计算验证了剪刃锁紧力是否符合要求,分析了剪刃锁紧在实际应用中遇到的具体问题,指出了剪刃锁紧拉杆内的碟簧组失效是导致下剪刃锁不住的原因,通过设计制作专用的剪刃轴向固定装置,解决了双切剪下剪刃窜出问题。     

轧制烧结法制取铜合金基体-金刚石薄刀片

本文介绍了电子工业中广泛采用的切割半导体晶片和基片的金刚石薄刀片的基本特点和技术要求;概述了粉末冶金法制取铜合金基体-金刚石薄刀片的基体材料、工艺流程和几个关键工序。对刀片的主要技术参数测定和切割试验分析表明,铜合金基体-金刚石薄刀片完全符合使用技术要求。     

Service failure of hot-stage turbine blades:

Surface-connected porosity in current military aircraft hot-stage turbine engine blades is associated with blade failure. Oxidation ratcheting is suggested as the failure mechanism. Sta- tistical comparison of new and used blade populations showed that for blades cast with an equiaxed structure, the porosity in new blades was associated with crack formation on the con- cave surface of the used blades. The pores did not tend to develop into cracks on the compressed (convex) surface of the blade. Insufficient suitable data on directionally solidified blades pre- vented similar statistical correlations. However, metallography of the directionally solidified blades showed that the in-service cracks were related to oxidation inside surface-connected pores and that the cracks were oriented in the same direction as the (axial) casting pores. Thus, the proposed failure mechanism through ratcheting is based on the following insights: (1) the blades are thermally cycled as a normal part of service; (2) the hot blades expand and the open pores are filled with oxide; (3) when the blade is cooled, thermal contraction of the metal is greater than the oxide, causing compressive stress and yield; and (4) thermal expansion of the blades opens the pores again, since yield relaxed compressive stress at low temperature. These insights were supported by metallographic and computer-simulation studies which showed that the pores grow 20 to 50 pct in width per 100 missions (about 90 hours of operation) for a military aircraft on a typical mission profile.     

双卧轴强制式混凝土搅拌机叶片的磨料磨损研究

双卧轴强制式混凝土搅拌机是一种高效、快速的混凝土搅拌器械,广泛用于各种混凝土工程中。以某型号双卧轴强制式混凝土搅拌机为研究对象,根据磨料磨损机理推出搅拌叶片线磨损率的计算公式,通过Fluent软件的计算和相关后处理工作得出搅拌叶片表面线磨损率的分布。分析结果表明,搅拌叶片的顶端附近处线磨损率最大,磨损最为严重;根据线磨损率的数值可预估搅拌叶片的使用寿命。研究对于预估整机的使用寿命提供了一定的理论依据和数值依据,对搅拌臂的布局和搅拌叶片材料的选择和处理也提供了一定的科学依据。     

金刚石锯片锋利性试验研究

通过室内锯切试验，对三种不同粒度、浓度的金刚石锯片在切割大理石时的锋利性能进行了比较，列出了锯切得到的数据结果；并通过理论计算与分析得出结论：当金刚石粒径不变时，适当减少金刚石浓度，锯片锋利性得到提高；当金刚石浓度不变时，适当增大金刚石粒度，锯片锋利性也能得到提高。同时，推导出了锯片金刚石参数设计中必须遵循的相邻两颗金刚石之间的最大间距原则。     

TRT发电机静叶承压缸叶片修复工艺

介绍了马氏体不锈钢1Cr13Mo叶片补焊工艺,根据厂里要求修复后要达到的效果、马氏体不锈钢的特性、叶片磨损程度和工期要求合理制定焊接修复工艺,圆满完成叶片修复工作,目前机组运行正常。     

提高切片机刀片寿命的探讨

实验指出,内圆切片机切片时,采用负向切片,对提高硅片均匀性及便于机械手取片是可取的,但会增加修刀次数,降低刀片寿命。掌握刀片刃口和基面的修磨技术是提高刀片寿命的关键。     

Microstructure,creep properties,and rejuvenation of service-exposed alloy 713C turbine blades

A study was carried out on the microstructure and creep properties of aero engine first-stage turbine blades made from Alloy 713C nickel-base superalloy. Results are reported for new blades, blades in two service-exposed conditions, and service-exposed blades subjected to one of three rejuvenation treatments: a recoating heat treatment, a hot isostatic pressing (HIP) + recoating heat treatment, and a HIP + controlled cooling + recoating heat treatment. The blade microstructure undergoes significant change during service, and this leads to a loss in creep properties exhibited by specimens machined from the blade airfoils. Good correlations were observed between the rupture time and the amount of blade airfoil untwist and between the minimum creep rate and the amount of untwist. The recoating heat treatment and the HIP + controlled cooling + recoating treatment were moderately successful in restoring the microstructure and creep properties of the service-exposed blades. In comparison, the HIP + recoating treatment was very successful in rejuvenating creep properties but only for blades having a chemical composition with a lower propensity to form σ phase. For the blades with an unfavorable composition, σ phase was found to form preferentially near the grain boundaries during creep testing, and this had a detrimental effect on the creep properties. Nonetheless, the degree of rejuvenation for these blades was always at least as good as that obtained through the recoating heat treatment alone. Formerly National Aeronautical Establishment     

轴流式压缩机渗氮静叶片试验分析

渗氮叶片的试验室试验及工业试验结果表明,渗氮叶片与渗氮试样总蚀磨损抗力存在较大差距。引起渗氮叶片冲蚀磨损抗力提高幅度不大的原因是：气流速度高、粉尘浓度集中、有少量硬粒子存在、长时间运行粉尘数量大等。