双相不锈钢的焊接热影响区组织和性能热模拟研究  

Thermal Simulation of Microstructure and Mechanical Properties of Duplex Stainless Steel in HAZ

作　　者：王振华[1] 蒋世应[1] 沈涛[1] 张强 

机构地区：[1]宜宾职业技术学院,四川宜宾644000 [2]四川理工大学材料与化工工程学院,四川自贡643000

出　　处：《铸造技术》2016年第5期894-897,共4页Foundry Technology

基　　金：四川省教育厅项目资助(11ZB003)

摘　　要：通过Gleeble-3800焊接热模拟试验机,对S32750双相不锈钢焊接热影响区（HAZ）进行了热模拟试验,并对试样显微组织进行观察,对硬度、冲击等力学性能进行检测,研究峰值温度对HAZ组织和性能的影响规律。结果表明,热影响区主要组织为奥氏体＋铁素体,峰值温度在850~1 000℃范围内时,HAZ组织中出现了σ相;随着峰值温度升高,奥氏体含量逐渐降低,铁素体含量先略有下降然后逐渐升高,σ相含量则是先略有增加后逐渐下降,当峰值温度达到1 050℃以上时几乎完全消失;HAZ硬度先略有升高,峰值温度为900℃时最高390 HV,随后硬度逐渐降低;冲击功则先略有下降,900℃时达到最低值60 J,随后冲击功又逐渐升高,1 100℃时冲击功大幅提高至102 J。By Gleeble-3800 welding thermal simulation testing machine, the HAZ of the SAF2507 duplex stainless steel was simulated, the simulated HAZ microstructure was observed, and the tensile and impact properties were detected, the effect of peak temperature on the HAZ microstructure and mechanical properties was investigated. The results show that the main microstructure of the heat affected zone was austenite and ferrite, the σ phase appears in HAZ when the peak temperature is in the range of 850~1 000 ℃. With the increase of peak temperature, austenite content decreases, the ferrite content first decreases slightly and then increases gradually, while the σ phase content first increases slightly and then gradually decreases and it almost completely disappeares when the peak temperature reaches 1 050 ℃. The hardness of HAZ slightly increases and then decreases gradually after the highest hardness of 390 HV at the peak temperature of 900 ℃.The impact energy first decreases slightly to the lowest value of 60 J at 900 ℃, and then impact energy increases gradually and significantly increases to 102 J at the peak temperature of 1 100 ℃.

关 键 词：峰值温度 热模拟 热影响区 显微组织 性能 

分 类 号：TG457.11[金属学及工艺—焊接]