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Zhang Zhiming Lu Daohua Li Zhonglin Harbin Institute of Technology Feng Qiting Peng Chuanliou Heilongjiang Electric Power Electrode Manufacturer Harbin Wang Ruilin Northeast Electric Power Test Institute Shenyang 《中国焊接》1992,(2)
The welded joint of dissimilar heat-resisting steels 20Crl2MoV(F12)and 12 Cr2MoWVTiB(102)generally works around 600°C.In this paperthree kinds of ferritic electrodes are used for testing.They are R817 high-strength electrode(CrllMoVNi),R347 low-strength electrode(Cr2MoVWB)and newly-developed R507MoNb medium-strength electrode.The study on theinfluence of those three different electrodes on carbon migration,HIC and hy-drogen diffusion shows that medium-strength electrodes can well control thecarbon migration,and that the tendency to HIC in the joint formed by R817 issmaller than that by R347 instead.Considering the effect of weld metal transfor-mation on the restraint stress and hydrogen concentration of a joint,the hydro-gen distribution in the heat-affected zone(HAZ)is calculated by using finite ele-ment method(FEM)with stress and strain changing,and so the effect of thetransformation behaviour on HIC is revealed.In addition,newly-developedR507MoNb electrodes,tested the elevated-temperature property,oxidation re-sistance and creep rupture strength,have fulfilled the technical standards con-cerned and passed the examination of on-the-spot operation. 相似文献
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采用显式动力学中的接触、侵蚀有限元分析方法,对PDC钻头的单齿工作参数变化进行了仿真。当绕钻头中心轴线旋转的单粒PDC切削齿在切削深度为2mm时,研究了具有不同前倾角、侧倾角破岩时切削齿的受力分布及岩石破碎情况。仿真结果较真实地表明了单粒PDC切削齿应力分布、接触压力分布随钻头破岩过程的动态变化情况,为PDC钻头的设计提供了有效的依据。 相似文献
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热输入对WEL—TEN780A高强钢焊接热影响区断裂性能和组织的影响 总被引:1,自引:0,他引:1
研究了焊接热输入对WEL-TEN780A高强度钢热影响区断裂性能的影响。结果表明,通过控制焊接热输入可以获得理想的焊接热影响区断裂性能。 相似文献
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12CrNi2A钢属合金结构钢,可焊性中等。为确保产品的焊接质量,特研制两种新型焊条,进行可焊性试验,终于实现冷焊工艺。而且对已经淬硬化的导杆,为了不使其在焊接热量作用下退火软化,成功地采用了浸入水中的快冷焊接工艺。 相似文献
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液压凿岩机活塞新材料开发和设计质量评估 总被引:4,自引:0,他引:4
研制了一种具有Cr-Ni-Mo新配比的低碳合金钢作为液压凿岩机冲击活塞用材,与常规活塞用材进行了金相组织、静强度、热处理后的表面和断面显微硬度及工业性对比试验,测试了凿岩机冲击性能。结果表明,该材料具有良好的淬透性、合理的金相组织和断面硬度分布以及较好的力学性能。还提出了应用凿岩机活塞冲击应力波波值系数;初步评估所设计活塞性能的方法。 相似文献