摘要
通过拉伸试验、疲劳试验,研究了氩弧焊修补对ZL114A合金砂型铸件性能的影响。结果表明,采用氩弧焊补焊工艺后,ZL114A合金砂型铸件抗拉强度、屈服强度下降5%左右,伸长率下降15%左右。这是因为焊接高温导致Mg烧损,使得合金的强化相Mg2Si减少,从而弱化了强化效果,使焊接区力学性能有所降低;焊接区域的金属在微观结构、孔洞的几何形状以及数量上与未焊接区域存在差异,在高应力条件下全焊接试样的疲劳寿命低于部分焊接和未焊接试样,但在低应力条件下部分焊接试样的疲劳寿命明显高于未焊接试样和全焊接试样的疲劳寿命。
Effects of the argon are welding repairing on the properties of ZL114A alloy sand castings were investigated by tensile testing and fatigue testing. The results reveal that the argon arc welding repairing has the ingored effect on properties of the ZL114A alloy sand castings,where the tensile strength and yield strength are decreased by about 5% and the elongation is decreased by about 15%. The high temperature of welding process can result in Mg element burn-loss,so the strengthening phase Mg2Si in the ZL114A alloy is reduced,leading to the decrease of properties of the welding zone. The difference of hole and pore geometry and number between the weld zone and un-welded zone can be observed, so fatigue life of full-welded specimen is lower than that of half welded and un-welded ones at high stress condition, while fatigue life of half-welded specimens is higher greatly than that of un-welded and full-welded ones.
出处
《特种铸造及有色合金》
CAS
CSCD
北大核心
2018年第1期93-96,共4页
Special Casting & Nonferrous Alloys
关键词
ZL114A砂型铸件
氩弧焊
力学性能
疲劳性能
ZL114A Sand Castings, Argon Arc Welding Repair, Tensile Properties, Fatigue Properties
