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针对沈阳白塔河南路人行桥的质量要求及制作难点,经过采取合理的工艺措施。控制了焊接变形,保证了焊接质量,达到了产品质量要求。 相似文献
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应力腐蚀机理研究的新进展 总被引:8,自引:1,他引:8
首先对近十年来在应力腐蚀机理研究中提出的主要新观点进行了评述,然后以作者近期关于应力腐蚀机理研究的结果为主,重点介绍了在溶解促进位错发射、增殖和运动及在应力腐蚀裂纹形核、扩展的透射电镜研究中取得的最新进展.最后提出了目前应力腐蚀机理研究中尚需进一步研究的问题. 相似文献
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A special constant deflection device for TEM has been designed, and then change of dislocation configuration ahead of a crack tip during stress corrosion cracking (SCC) of brass in water and of Ti-24Al-11Nb alloy in methanol and initiation of SCC can he observed in TEM In situ tensile test in TEM for brass was carried out for comparison The results show that anodic dissolution during SCC can facilitate dislocation emission, multiplication and motion, and a dislocation free zone (DFZ) is formed The stress at a particular site in the DFZ, which is an elastic zone and is thinned gradually through corrosion-enhanced dislocation emission and motion, is possibly up to the cohesive strength, resulting in initiating of a nanocrack of SCC in the DFZ or sometimes at the crack tip. Because of the action of the corrosion solution the nanocrack of SCC propagates into a cleavage or intergranular microcrack rather than blunts into a void like in situ tension in TEM 相似文献
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针对意大利某钢厂地德式热风炉箱形梁的质量要求及制作难点,经采取合理的焊接工艺措施,控制了焊接变形,保证了焊接质量,达到了产品质量要求. 相似文献
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