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Abstract:It had been studied that the effect of deformation temperature and strain-rate and strain and original grain size on stress-strain law by with thermal simulation experiment. It was analyzed that the effect of factors on crystal grain size of dynamic recrystalization (DRC). It was established that the kinematics model of super-alloy GH4169, which was relationship between the grain size of dynamic recrystallization(DRC) and function Z and technology parameters. It was established that the dynamics model of super-alloy GH4169, which was relationship between the quantity of dynamic recrystalization and function Z and technology parameters. The results presented that the grain size of dynamic recrystalization increased with increasing of temperature, and increased with the reducing of strain-rate. And it having no relationship with original grain size. The quantity of dynamic recrystalization reduced with increasing of original grain size. 相似文献
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The modeling control method based on the dynamic resistance characteristics of good nuggets, that is the DRC method, is an improvement on the dynamic resistance threshold method for the quality control of resistance spot welding. But there is still a control blind area in the initial four cycles. For this reason, the quality of every weld nugget could not be fully ensured. Thus a new fuzzy cooperative control method is put forward. It uses a multi-information time-control mechanism by combining the constant current control technology with the DRC method in a relay way. This whole-process control strategy has led to a good control effect and produced the dual-identicul results in the weld nugget quality and the welding time. 相似文献
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鉴于过多的木材出口已影响到刚果民主共和国(刚果(金))的生态,近期刚果(金)政府经过重新考虑,取消了近60%的木材合同。刚果(金)环境部长Jose Endundo说:“通知取消的合同,经营者必须立即停止砍伐。” 相似文献
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基伍湖(Lake Kivu)横跨卢旺达和刚果民主共和国国界,湖水中溶解了数十亿立方米的甲烷,如果气体继续累积或一旦受到类似火山、地震活动的触发就会突然喷发出来,其后果将是不堪设想的一切灾难。一方面为了避免类似的灾难发生,另一方面为了解决卢旺达的电力供需问题,政府决定实施甲烷开发项目,该项目由瑞士科学家具体组织实施。 相似文献
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李春棠 《有色金属再生与利用》2007,(6):41-44
一、矿区的位置刚丰德瓦矿区位于刚果民主共和国加丹加省利卡西市西北,直距25公里,南部与刚波务铜矿邻近。这是刚果矿业公司的主要生产铜钴矿石的基地。所产矿石,送往刚波务选治厂进行选冶处理。刚波务选 相似文献