widmanstatten structure

The Damage of Widmanstatten Structure to Gear Strength and its Control Method

魏氏组织对齿轮强度的危害及其控制方法

Coarse Widmanstatten structure does not appear in the weld microstructure of Microscopic observation .

观察焊缝的微观金相组织发现，冷、热丝TIG对接焊缝中未出现粗大魏氏组织。

The Formation of Widmanstatten Structure and Study on Mechanical Properties in Low Carbon Manganese Steel

低碳锰钢魏氏组织的形成及力学性能

It is resulted Widmanstatten structure , inclusion and banded structure are mainly reasons causing impact property lowness .

结果表明，钢中魏氏体组织、非金属夹杂物及带状组织是导致冲击性能偏低的主要原因。

The Widmanstatten structure changes into the basket weave structure in the alloy TC11 heat-affected zone of joint .

TC11合金热影响区的魏氏组织转变为网篮组织；

The specimens with Widmanstatten structure have higher impact strength and lower ductile-brittle transition temperature than those with equiaxial granular ferrite structure .

有魏氏组织的试样较呈等轴铁素体的试样有更高的冲击韧性和更低的韧脆转变温度。

The Early Metallographic Studies of Chih-Hung Chou on the Formation and Morphology of Widmanstatten Structure and Martensite

周志宏对魏氏组织及马氏体的形成和形貌的早期金相研究

The existence of the Widmanstatten structure can reduce foe fracture toughness of the material and bring about fateful damage to gear strength .

魏氏组织的存在，可降低材料的断裂韧度，对齿轮强度有致命危害。

Widmanstatten Structure of CuCo_2Be Alloy

高强高导CuCo2Be合金的魏氏组织

The research describes the formation of Widmanstatten structure and martensite in iron-carbon alloys possessing a broad range of carbon contents and heat treated using a broad range of cooling rates .

该项研究描述了铁碳合金中魏氏组织和马氏体的形成，所用合金具有宽的碳含量范围，热处理时采用的冷却速率范围也是宽的。

The results show that the banded ferrite structure , widmanstatten structure , dendritical microstructure and nonmetallic inclusion which decreasing the toughness of the steel cause the brittle fracture .

结果表明，宏观断口为脆性断裂，金相组织不仅有回火索氏体，还包含不应有的带状铁素体、魏氏体组织及明显的枝状晶和非金属夹杂物，从而导致钢的韧性降低。

By comparing the ribbed bars with brittle fractures to the qualified rebars , it has been found that the widmanstatten structure , the rolling defects and the high inclusion are the major causes .

结果表明，魏氏组织较多、轧制缺陷及夹杂物过多是造成脆断的主要原因，并提出了相应的解决措施。

The chemical constituents of the pipe are qualified to the standard requirement . However , the grain in the heat affected zone of weld is coarser than base metal , and the needle widmanstatten structure appears .

管材的化学成分符合质保书以及材料标准要求；但焊缝热影响区晶粒较母材粗大，并出现针状魏氏体组织。

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 .

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 fracture of the piston rod is fatigue fracture , the reasons are that gross Widmanstatten structure is existed in the microstructure of the piston rod , and the values of hardness and strength are relatively low .

结果表明，活塞杆断裂为疲劳断裂，其显微组织中存在的严重魏氏组织缺陷和材料的硬度、强度值偏低是导致活塞杆断裂的原因。

The feature of Widmanstatten structure , the microstructure of acicular ferrite , impact fracture surface and the initiation , propagation and restraint of crack etc were investigated in this steel by means of optical microscope , TEM and SEM , Leitz-Texture-Analyse-System .

用光学显微镜，透射电子显微镜，扫描电子显微镜，图象分析仪等手段研究了S15A钢魏氏组织的形貌、针状铁素体的精细结构、冲击断口形貌、裂纹的萌生及扩展和受阻。

The testing results showed that the weakest fracture toughness of welded joints was at the overheated zone of HAZ nearing the bond line , and the low toughness brittle failure was caused by the existance of the widmanstatten structure and structural heredity of HAZ .

结果表明，焊接接头断裂韧性的薄弱环节在热影响区（HAZ）近熔合线的过热区，该区中粗大的魏氏组织和部分组织遗传现象是导致低韧性脆化的主要原因。