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针对ASTM A668 CL.E材料试样出现抗拉强度、伸长率不合格等质量问题,通过扫描电镜分析,判断断口缺陷性质为白点。 相似文献
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通过优化ASTM A668E材料的化学成分,合理添加合金元素,仅经过锻后热处理,成功制造出超长大直径空心水轮机轴锻件,极大地缩短生产周期,降低制造成本。 相似文献
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我公司为某厂生产的水轮机轴产品,调质后硬度未能满足要求。通过调整化学成分,控制合金元素含量,提高硬度值,极大地改善了ASTM A668 CL. E材料各项性能。 相似文献
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通过研究奥氏体化温度、冷却方式、回火温度对ASTM A668 CL.E钢强度、塑性及韧性的影响,确定最合理的热处理工艺为870℃奥氏体化后加速冷却+670℃回火。 相似文献
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针对生产中出现的Q390E热轧H型钢屈服强度不合格的原因进行了分析。通过工艺对比以及试样检测发现,轧制道次增加以及终轧温度过高会导致钢材晶粒较大,降低了钢材的强度。终冷温度过高导致位错、空位等缺陷在基体中保留较少,不利于组织细化,是导致屈服和抗拉强度强度不合格的主要原因。 相似文献
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Peter N. Comley 《Journal of Materials Engineering and Performance》2008,17(2):183-186
The determination of the superplastic properties of a material, just like any mechanical property, is highly dependent on
the test method, coupon geometry, and analysis of the raw data from the test. Thus the published properties of a material
from one source will differ from that of another source unless a common test method is employed. The ASTM E2448 Standard Test
Method for Determining the Superplastic Properties of Metallic Sheet Materials has been written to provide a common platform
for testing, evaluating, and publishing superplastic properties to a uniform format, useful for both academia and industry.
The Boeing Company is now using ASTM 2448 to quantify the superplastic properties of fine grain Ti-6Al-4V alloy, and is specifying
it to qualify production material to the Boeing Material Standard BMS7-385. The standard includes specimen geometry and testing
conditions, the test machine requirements, and how to analyze the data, including the basic stress vs. strain curve and determination
of ‘m’ value.
This article was presented at the AeroMat Conference, International Symposium on Superplasticity and Superplastic Forming
(SPF) held in Baltimore, MD, June 25-28, 2007. 相似文献
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就材质为SWRCH22A冷墩盘条生产的自攻螺钉出现的攻速不合问题进行了系列检测分析及试验研究,找出其存在的热处理工艺问题,最终解决了自攻螺钉攻速不合问题。 相似文献