分析了铝型材表面晶粒粗大的原因。
The cause of surface coarse grain of aluminium profile is analyzed.
结果表明，材料的原始晶粒粗大是产生裂纹的主要原因。
The results showed that the cracking on fish plate was mainly resulted from the grain coarsening of material.
机架的常见缺陷有裂纹、掉砂、夹渣、缩孔缩松和晶粒粗大等。
The common defects of the housing casting include cracks, sand drop, slag inclusion, shrinkage porosity and rough grain, etc.
原始裂纹在晶粒粗大及组织变形等敏感处相互连接扩展，最终导致断裂。
The original crack is connected at sensitive place where the crystal is thick and the structure is transformative, and then finally causes broken.
经试验分析是由于该段晶粒粗大，淬火时组织应力超过该段的材料强度所致。
Through test analysis, we found that it is caused by the large size grain in this section, as well as the structure stress in this section over the material strength.
本文针对包钢原来生产的J55石油套管冲击韧性不足，晶粒粗大的问题开展研究。
CVN(Charpy V-notch) toughness and grain size number of J55 grade oil casings produced by Baotou Iron and Steel Company did not meet the reiative standards in the past.
晶粒粗大及晶间网状铁素体强烈降低材料的裂纹扩展阻力，并极易导致裂纹的失稳扩展。
Coarsening grain and intercrystalline network ferrite depress crack growth resistance of the materials strongly and result in unstable propagation of crack very easily.
奥氏体晶粒粗大及奥氏体柱状晶都能够降低焊缝的韧性，并提出了改善焊缝韧性的途径。
Either coarse or column austenite grain can decrease the toughness of welding metal, and the ways to improve the toughness of wel...
在铸造过程中容易产生各种铸造缺陷，如晶粒粗大、缩孔缩松、开裂、组织和成份偏析等。
It is liable to produce various casting defects, such as coarse grain, shrinkage cavity, shrinkage porosity, hot tearing, microstructure segregation and solute segregation.
卷扬机传动轴的断裂为典型的低应力脆断事故，主要原因是传动轴的组织疏松、晶粒粗大、。
The failure of the driving shaft in a hoister is caused by typical brittle fracture under low stress.
高温小变形时容易发生不完全再结晶，造成晶粒粗大且不均匀，在随后的轧制过程中很难消除。
Small deformation in high temperature is easy to cause incomplete recrystallization and bulky and uneven grain. It is hard to eliminate them in subsequent rolling process.
有些情况下﹐若镀液中主盐的金属离子为简单离子时﹐则镀层晶粒粗大﹐因此﹐要采用络合离子的镀液。
In some cases, if the salt solution of the metal ion content for simple ion, the coating, therefore, coarse grains to adopt complexation ion of plating solution.
另外大量之高温塑性变形可以产生较小之肥粒铁晶粒这样可以抵消高温热浸温度所造成之晶粒粗大效应。
Large amounts of deformation can lead to smaller ferrite grains which can balance the high temperature soaking effect.
结果表明，水龙头阀体开裂是由于存在过热造成的晶粒粗大、魏氏组织、铸造疏松等缺陷引起的脆性开裂。
The results show that the cracking of the tap valve is brittle crack, which is due to overheat to cause the formation of defects, such as coarse grains, Widmanstatten structure and porosity.
水轮机叶片有较大的工作应力、热影响区的晶粒粗大以及水介质的腐蚀性是产生机械腐蚀疲劳汽蚀的重要原因。
The larger tension stress in the hydraulic turbine blades, grain coarsening in the heat-affected zone and the causticity of fluid medium are the major causes of cavitation erosion.
结果表明，原材料中存在的夹杂物、晶粒粗大及混晶等冶金质量缺陷是盘条在拉拔过程中发生断裂的主要原因。
The results showed that the metallurgical defects such as inclusions, coarse crystal grains and asymmetry of the grain size were the main reason resulting in fracture of the steel rods during drawing.
在TCS不锈钢前期焊接试验中发现其焊接接头热影响区的冲击吸收功值在熔合线附近较低，原因是接头热影响区晶粒粗大所致。
In welding test of TCS stainless steel, it was found that impact absorbing energy of heat-affected zone (HAZ) near bond line in welded joint was low.
在TCS不锈钢前期焊接试验中发现其焊接接头热影响区的冲击吸收功值在熔合线附近较低，原因是接头热影响区晶粒粗大所致。
In welding test of TCS stainless steel, it was found that impact absorbing energy of heat-affected zone (HAZ) near bond line in welded joint was low. The reason is coarse grain in HAZ.
含有粗大的铁素体晶粒和残留的热轧织构，引起力学性能的各向异性，导致了抗拉强度和延伸率的降低。
Big ferrites and hot rolling texture are left behind in particle structures, Which leads the anisotropy of mechanics, so the tensile strength and elongation rate reduce.
结果发现，经一定的循环处理后，可以有效地细化经高温离子渗碳后的粗大晶粒，并能改善机械性能。
The results showed that, by certain cyclic quenching process, coarse grain of high temperature ion-carburizing can be fined effectively and its mechanical property can be improved.
而粗大的晶粒及连续的晶界容易产生应力集中，因此合金经固溶时效后具有较低的塑性和冲击值。
However, large grain size and continuous grain boundaries combine to produce stress concentrations, thus lowering the plasticity and impact value of alloy after solution and aging treatment.
峰温越高，奥氏体晶粒越粗大，冷却后形成的马氏体板条束尺寸也越大。
The higher the peak temperature, the coarser the grain size of prior austenite, the larger the martensitic lath bundle after phase transformation.
结合生产实践，分析铸轧带坯产生粗大晶粒的主要原因，提出了铸轧带坯晶粒度的控制和细化措施。
The main cause of coarse grain formed in cast and rolled strips were analyzed combining with production practice. How to control and refine the grain size of cast and rolled strips is put forward.
与完全氢爆相比，选择氢爆后的晶粒较粗大，且较均匀，但细小晶粒较少。
Compared with the grains of complete hydrogen decrepitation, the grains of selective hydrogen decrepitation are relatively larger and more uniform, but small grains are fewer.
合金铸造温度越高，晶粒越粗大。
The higher the casting temperature, the larger the crystal of the keeper.
合金铸造温度越高，晶粒越粗大。
The higher the casting temperature, the larger the crystal of the keeper.
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