焊补对船用螺旋桨材料疲劳强度的影响

• 作 者: 佐佐木佳男 方正春
• 出 处: 国外舰船技术(材料类)
• 发表日期: 1984年10期
• 关键词: 焊补 疲劳强度 船用螺旋桨 残余应力 船舶螺旋桨 弯曲载荷 断口金相 应力比 实际使用条件 样制

为了搞清焊补对船舶螺旋桨疲劳强度的影响,在3％人造海水中,采用平面弯曲载荷和应力比R=0.4的螺旋桨实际使用条件下,对基体金属和焊接金属进行了一系列试验。为了使试样的应力梯度和实体螺旋桨的应力梯度一样,试样制成长700毫米、宽200毫米、厚50毫米的大型试样。试样材料,则采用了镍-铝青铜和锰黄铜两种螺旋桨材料。基体金属和焊接金属二者的疲劳强度没有差别。另外,还成功地测定了焊接区周围的残余应力,并且用断口金相显微镜观察了这些材料的疲劳断口。

In order to find out the effect of welding compensation on the fatigue strength of ship propellers, a series of experiments on base metal and weld metal were carried out in 3% man-made seawater under the actual conditions of propeller with plane bending load and stress ratio R = 0.4. In order to make the sample stress gradient and solid propeller stress gradient, the sample made of 700 mm long, 200 mm wide, 50 mm thick specimen. Sample materials, the use of nickel - aluminum bronze and manganese brass two propeller materials. There is no difference in fatigue strength between the base metal and the weld metal. In addition, the residual stresses around the weld zone were successfully measured and the fatigue fracture of these materials was observed with a fracture metallurgical microscope.