本文主要通过断口分析，找出了Z 12v190 B型柴油机大修后导致曲轴断裂失效的主要原因，并提出了相应的改进措施。
By fracture analysis, this report presents the main causes for fracture failure of the crankshaft on overhauled Z12V190B diesel engines and puts forward some appropriate protective measures.
随着加载速度的加快，河流纹断裂形态逐渐变得明显，同时断口形貌变得更加粗糙。
With the increase of displacement speed, fracture mode of the river patterns gradually became obvious and fracture surface became coarser.
对汽轮机断裂叶片进行了金相组织观察、断口扫描及能谱分析。
Metallographic observation, fracture scanning and energy dispersion spectrum analysis on the fractured turbine blade were carried out.
通过比较不同时效工艺制度的性能指标和断口形貌，总结出时效制度对7B04铝合金断裂韧度的影响规律。
The tensile performance and the fracture toughness of 7B04 aluminium alloy have been determined, and the fracture of tensile sample is scanned.
针对断裂叶片及拉筋进行了化学成分、金相组织、硬度、断口等分析，以便找到叶片断裂的原因。
The chemical composition, metallographic structure, hardness and surface of fracture are analyzed herein for the broken blade and lacing wire in order to find the cause of blade fracture.
在最佳超塑性条件下，断口中形成了大而深的空洞，晶界滑动和晶间断裂特征明显。
The deep and large cavities are formed on fracture surface and grain boundary sliding and intergranular fracture characteristic is obvious on the optimal superplastic deformation condition.
但是中厚壁钢管DWTT试验经常产生解理断裂部分塑性变形大的逆向断口，使试样无效。
But for medium thickness pipe DWTT, it usually converse fraction of figure transforming much in break part, and make specimen failure.
对45碳钢氮碳共渗处理疲劳断裂后的断口附近的显微硬度，组织特征进行了分析。
The microhardness, microstructure characteristics of the nitrocarburized 45 carbon steel after fatigue fracture were studied.
采用光学显微镜、扫描电镜等分析手段，对45钢大齿轮传动轴断裂表面的金相组织、断口形貌进行了分析和检测。
The metallurgical structure and fracture morphology on gear transmission shaft of 45 steel were analyzed by means of optical microscope and scanning electron microscope.
两组具有不同形变机制的奥氏体不锈钢拉伸断口均为韧性断裂。
Interestingly, the tensile fracture of the two austensite stainless steels with different deformation mechanism is ductile fracture.
对断裂的汽车柴油机高压出油阀紧座的宏观、微观断口及显微组织进行了研究。
The fracture surface of a failed injection valve nut of diesel engine high pressure oil pump was investigated by visual and SEM.
对断裂起重机吊具zg270- 500铸钢的化学成分、硬度、显微组织、断口形貌等进行了检测和分析。
The chemical composition, hardness, microstructure and fracture morphology of ZG270-500 cast-steel of cracked lifting instrument were detected and analyzed.
根据有限元计算、断口分析和实测数据对万向接轴断裂的原因进行分析。
Based on finite element method, break analysis and the measured data, the paper analyzes the breakage reasons of universal joint.
这种界面冶金结合层并不会引起脆性断裂，具有与基材相同的韧性断口形貌。
The interface layer of metallurgical bonding will not induce brittle fracture and will share the ductile SEM fractographs of the substrate.
通过对管束大量电子断口的观察分析，证明了断口为准解理断裂，具有河流花样的特征。
According to analysis result of tubes' cracks fracture observation, it proves that the fracture is quasi-cleavage fracture which is characterized by river pattern.
结果发现，TWIP钢具有典型的延性断裂断口特征，其变形和断裂过程为微孔洞的形核、长大和聚合。
It was found that the fracture of TWIP steel was typical ductile fracture pattern and its deformation and fracture processes were the formation, growth and coalescence of microvoids.
拉伸过程中形成的氧化物夹杂成为裂纹源，断口表现为沿晶断裂。
The fracture surface appeared intergranular crack, due to the oxide formed during tensile test.
对45钢连接螺栓断裂件的显微组织、断口形貌、硬度和抗拉强度进行了观察分析和测试。
The microstructure, surface fracture morphology, hardness and tensile strength of the failed 45 steel connecting bolt were analyzed and tested.
结合拉伸断口形貌分析，讨论影响铅基复合材料拉伸断裂过程的主要因素。
The main factor which affects on the tensile fracture of the C/Pb composites was given.
并结合断口分析，探讨了钨合金在冲击作用下发生断裂的微观特征与韧脆转化间的关系及其物理本质。
Microscopic features of dynamic fracture of tungsten alloys under shock loading, as well as their relationship with the ductility_brittleness transition were discussed.
通过对管线钢不同温度的落锤撕裂试验和微观断口分析，研究了DWTT试样断口的分层裂纹及其对断裂的影响。
The delamination crack and its effect on the fracture of pipeline steel were investigated by drop-weight tear test(DWTT)at different temperature and micrograph analysis.
铸造A356-T6铝合金试样的拉伸断口显示其断裂为韧性断裂与脆性断裂的混和模式。
The tensile fracture mechanism of cast A356-T6 aluminum alloy revealed a trangranular model(along the cell fracture) with quasi-cleavage feature.
在高强度双金属复合导线的拉拔过程中，往往产生杯锥状断口的断裂形貌。
The cup and cone-shaped fractures often occur when a high strength bimetal composite wire is drawn.
拉伸断口形貌表现出韧性断裂特征。
Tensile fracture morphology is characterized by ductile rupture.
分析结果表明，断裂钢轨化学成分满足标准要求，低倍组织和显微组织正常，断口呈脆性断裂解理特征，断口处氧化严重。
The results show that the chemical composition, macrostructure and microstructure are normal, the fracture appearance is brittle crowbarand, and the fracture was oxygenated severely.
由此可以断定油管断口属疲劳断口，油管的断裂失效性质是疲劳断裂。
Therefore it can be judged that the fractures in the tubing are fatigue fractures and the tubing failure is caused by fatigue fracture.
借助光学显微镜、扫描电镜等手段，对用埋铸法生产的T9815气轮机组隔板断裂部位的金相组织特征，宏观和微观断口形貌等进行了研究。
The microstructure characteristics, macro and micro fracture morphology of brittle broken embedded casting closure of T9815 turbines were investigated by means of metallographical examination and SEM.
某油田一天然气井的产量突然下降，经检查发现该井采气装置中的节流阀柱塞套断裂为三截，形成了两对断口。
The yield of a natural gas well in an oilfield dropped suddenly, which was due to the piston sheath of the choke valve breaking into three parts with two pairs of fractures after inspection.
某油田一天然气井的产量突然下降，经检查发现该井采气装置中的节流阀柱塞套断裂为三截，形成了两对断口。
The yield of a natural gas well in an oilfield dropped suddenly, which was due to the piston sheath of the choke valve breaking into three parts with two pairs of fractures after inspection.
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