t8/5对高强度余热处理棒材焊接热影响区组织和力学性能的影响
Effects of t8/5 on Microstructure and Mechanical Properties of Weld Heat-Affected Zone of High-Strength Residual Heat Treatment Steel Bar
摘 要
采用Gleeble-3500型热模拟试验机研究了不同t8/5对高强度余热处理棒材焊接热影响区(HAZ)显微组织和力学性能的影响。结果表明:随着t8/5增大,粗晶热影响区(CGHAZ)的组织由羽毛状上贝氏体、短条状下贝氏体和铁素体转变为粒状贝氏体、珠光体和铁素体;HAZ的室温冲击功先增大后减小,并在t8/5=100 s时达到最大;当t8/5>60 s后,CGHAZ组织由珠光体和铁素体组成;HAZ的硬度随着t8/5增大而降低;高强度余热处理棒材能够满足实际生产需要的t8/5区间为20~300 s。
棒材
焊接热输入
焊接热影响区
显微组织
冲击韧性
显微硬度
residual heat treatment
steel bar
weld heat input
weld heat-affected zone
microstructure
impact toughness
mico-hardness
Abstract
The effects of different t8/5 on microstructure and mechanical properties of heat-affected zone(HAZ) of high-strength residual heat treatment steel bar were studied by using Gleeble-3500 welding thermal simulation tester. The results show that, with the increase of t8/5, the microstructure of coarse grain heat-affected zone (CGHAZ) changed from feather-like upper bainite, strip-like lower bainite and ferrite to granular bainite, pearlite and ferrite. The impact energy of heat-affected zone at room temperature increased firstly then decreased and reached the maximum when t8/5=100 s. When t8/5was more than 60 s, the microstructure of CGHAZ was made of ferrite and pearlite. The micro-hardness of heat-affected zone decreased with the increase of t8/5. The high-strength residual heat treatment steel bar would be meet the production needs with the range of t8/5 from 20 s to 300 s.
中图分类号 TG444.1
所属栏目 物理模拟与数值模拟
基金项目 国家科技支撑计划项目(2008BAG07B03);南通市应用研究计划项目( BK2013033);南通市瞪羚计划项目(AA2012021)
收稿日期 2014/2/15
修改稿日期 2014/9/21
网络出版日期
作者单位点击查看
备注肖轶(1980-),男,江苏南通人,高级工程师,博士研究生。
引用该论文: XIAO Yi,FANG Jian-hui,ZHONG Qing-dong,LIU Wei-dong. Effects of t8/5 on Microstructure and Mechanical Properties of Weld Heat-Affected Zone of High-Strength Residual Heat Treatment Steel Bar[J]. Materials for mechancial engineering, 2014, 38(11): 99～103
肖轶,方建慧,钟庆东,刘卫东. t8/5对高强度余热处理棒材焊接热影响区组织和力学性能的影响[J]. 机械工程材料, 2014, 38(11): 99～103
被引情况:
【1】梁国俐, "DH32船板钢埋弧焊接头的力学性能",机械工程材料 40, 103-105(2016)
【2】梁国俐, "EH36船板钢埋弧焊接头的组织和力学性能",机械工程材料 40, 28-31(2016)
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【3】肖轶. 基于有限元的圆钢环缝旋流两段控冷过程温度场模拟［J］.机械与电子,2010(8):9-13.
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【5】EN10080 Steel for the reinforcement of concrete weldable reinforcing steel general［S］.
【6】卢彦会,白占顺. 余热处理生产高强度钢筋性能研究［J］. 热加工工艺,2010,38(2):14-16.
【7】SHOME M,GUPTA O P,MOHANTY O N. A modified analytical approach for modelling grain growth in the coarse grain HAZ of HSLA steels［J］.Scripta Materialia,2004,50(7):1007-1010．
【8】宋洁,王哲,曹睿,等.低碳贝氏体高强钢焊接接头的组织与拉伸性能［J］.机械工程材料,2013,37(4):87-92.
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