P92新型耐热钢焊接粗晶区回火参数选择  

SUITABLE TEMPER PARAMETER FOR COARSE GRAIN ZONE OF NEW TYPE HEAT-RESISTANT STEEL P92

作　　者：肖凌[1] 朱平[1] 史春元[1] 李宜男[2] 王守革[2] 杨松[2] 

机构地区：[1]大连交通大学,116028 [2]哈尔滨锅炉厂有限责任公司,150046

出　　处：《焊接》2006年第11期52-55,共4页Welding & Joining

基　　金：国家863项目二级子课题(2002AA526012)

摘　　要：采用焊接热模拟的方法，模拟HAZ粗晶区组织，并在不同回火参数下对试样进行焊后热处理。通过室温下冲击试验及扫描电镜（SEM）、透射电镜（TEM）分析，确定P92钢合理的回火参数区间为21．26．21．67，其回火工艺参数为（760±10）℃／6h。在此参数下进行焊后热处理，其冲击吸收功较高，韧性较好，可以得到较好的使用性能。经扫描电镜和透射电镜分析微观组织证实，在此条件下进行回火在板条马氏体的晶界和晶内有弥散分布的碳化物，这些碳化物起到了提高韧性的作用。By use of the method of welding thermal simulation, the morphology in HAZ was simulated and the postweld heat treatment under different tempering parameter to the test specimen was carried out. By means of analysis of SEM, TEM and impact test under room temperature, the reasonable tempering parameter interval of P92 steel is determined from 21.26 to 21.67 and its tempering parameter is （760 ± 10） ℃ ×6 h. When reasonable tempering parameter is adopted, the impact absorbing energy of the weld metal is higher, its toughness better, and the better service performance may be obtained. With the help of SEM and TEM analysis, it is confirmed that under that conditions, the carbides dispersed at grain boundary and intracrystalline of martensite, so enhanced the toughness of the weld metal.

关 键 词：焊接热模拟 粗晶区 焊后热处理 回火参数 

分 类 号：TG142.33[一般工业技术—材料科学与工程]