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In this essay, we studied how heat input affected the microstructure, hardness, grain size and heat-affected zone (HAZ) dimension of WCX355 ultra-fine grain steel which was welded respectively by the ultra narrow-gap welding (UNGW) process and the overlaying process with CO2 as protective atmosphere and laser welding process. The experimental results show when the heat input changed from 1.65 kJ/cm to 5.93 kJ/cm, the width of its HAZ ranged from O. 6 mm to 2. 1 ram. The average grain size grew up from 2 ~ 5 pln of base metal to 20~70 um and found no obvious soften phenomenon in overheatedzone. The width of normalized zone was generally wide as 2/3 as that of the whole HAZ, and the grain size in this zone is smaller than that in base metal. Under the circumstance of equal heat input, the HAZ width of UNGW is narrower than that of the laser welding. 相似文献
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窄间隙焊接技术中焊接方法特性的遗传 总被引:1,自引:1,他引:1
分析了常用焊接方法的主要技术特性在窄间隙焊接技术中的遗传,以及常用焊接方法的局限性对窄间隙技术的可靠性和应用特性的影响。 相似文献
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热挤压工艺参数对汽车轮毂套管的锻造性能和服役寿命具有重要的影响.首次采用Taguchi理论对EQ153汽车轮毂套管的热挤压工艺进行最优化处理.以不同工艺下的损伤、应变和应力作为目标值,通过灰关联分析和方差分析得到初锻温度、挤压速度和摩擦系数的最佳水平.优化结果良好,对轮毂套管的热挤压具有指导意义. 相似文献
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采用STT焊接电源进行了400 MPa级超细晶粒钢焊接试验.结果表明,在表面张力过渡CO2气保焊条件下,超细晶粒钢热影响区宽度极窄约为1 mm,随着线能量增大,热影响区中过热区的晶粒尺寸随之增大,但低线能量的表面张力过渡使晶粒长大的程度得到控制.各焊接线能量下,热影响区各区平均硬度不低于母材,不存在软化现象.过热区为多相组织混合形貌,为低碳马氏体、贝氏体、珠光体、铁素体的不平衡混合组织.对线能量3.68 kJ/cm时的焊接接头进行综合力学试验,发现超细晶粒钢的热影响区硬度、强度和韧性均高于母材. 相似文献
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