论文部分内容阅读
采用模拟焊接热循环方法 ,研究奥氏体区不同热循环对奥 贝球铁缩孔焊补热影响区 (HAZ)显微组织、抗拉强度、冲击韧性和断口形态的影响。试验结果表明 :模拟焊补缩孔HAZ中奥氏体区上限温度区显微组织变化大 ,力学性能差 ,是焊接接头的最薄弱环节 ,而在贝氏体转变温度区间内施加缓冷的热循环 ,奥氏体区内产生一定量奥 贝组织 ,力学性能改善 ,达到与奥 贝球铁母材的力学性能相匹配。
The effects of different heat cycles in austenite region on the microstructure, tensile strength, impact toughness and fracture morphology of heat affected zone (HAZ) of the austenite ductile iron were studied by means of simulated welding thermal cycling. The experimental results show that the microstructure of the HAZ in the simulated welding shrinkage HAZ has large changes in the microstructure and poor mechanical properties, and is the weakest link in the weld joint, while the slow cooling heat is applied in the bainite transformation temperature range Cycle, austenitic region to produce a certain amount of oyster organization, improved mechanical properties, to achieve with the mechanical properties of the Auspice nodular base metal to match.