热循环对9Ni钢接头粗晶热影响区显微组织和低温韧性的影响
Effects of Thermal Cycle on Microstructure and Cryogenic Toughness of Coarse-Grained Heat Affected Zone of 9Ni Steel Joint
摘 要
采用Gleeble-3500型热模拟试验机在t8/5（800℃到500℃冷却时间）分别为6，10，30，60，100 s下制备了9Ni钢接头粗晶热影响区（CGHAZ）试样，并对试样进行了低温冲击试验，研究了t8/5对CGHAZ显微组织和低温韧性的影响。结果表明：CGHAZ的显微组织主要由板条马氏体组成，当t8/5为30 s时，显微组织中出现粒状贝氏体，且其数量随t8/5的延长而增多；随着t8/5的延长，CGHAZ中马氏体板条束尺寸先略有增大后减小，韧脆转变温度先升高后降低；不同t8/5下CGHAZ在-100，-125℃的冲击功都高于200 J，随着冲击温度的下降，冲击断口均由韧窝形貌向准解理形貌转变。
低温韧性
焊接
热循环
粗晶热影响区
9Ni steel
cryogenic toughness
welding
thermal cycle
coarse-grained heat affected zone
Abstract
Coarse-grained heat affected zone (CGHAZ) samples of 9Ni steel joint were prepared with Gleeble-3500 type thermal simulator at t8/5 (cooling time from 800℃ to 500℃) of 6,10,30,60,100 s, respectively, and then cryogenic impact tests were carried out on the samples. The effects of t8/5 on the microstructure and cryogenic toughness of CGHAZ were investigated. The results show that the microstructure of CGHAZ was mainly composed of lath martensite. The granular bainite appeared at t8/5 of 30 s and the amount increased with increasing t8/5. With increasing t8/5, the size of martensite lath in CGHAZ increased slightly and then decreased; the ductile-brittle transition temperature rose and then decreased. The impact energy at -100℃ and -125℃ of CGHAZ prepared at different values of t8/5 was higher than 200 J. With decreasing impact temperature, the impact fracture morphology changed from dimple to quasi-cleavage.
中图分类号 TG142.33 DOI 10.11973/jxgccl201808016
所属栏目 物理模拟与数值模拟
基金项目 华中科技大学材料成形及模具技术国家重点实验室开放基金资助课题（P2018-014）；湖北理工学院校级教研项目（2017C02）
收稿日期 2017/1/11
修改稿日期 2018/3/3
网络出版日期
作者单位点击查看
备注杨秀芝(1974-),女,湖北武汉人,副教授,博士
引用该论文: YANG Xiuzhi,ZHANG Lichao,LI Xuan,HUA Wenlin,YANG Chunjie,DONG Chunfa,XIAO Xinhua. Effects of Thermal Cycle on Microstructure and Cryogenic Toughness of Coarse-Grained Heat Affected Zone of 9Ni Steel Joint[J]. Materials for mechancial engineering, 2018, 42(8): 78～82
杨秀芝,张李超,李轩,华文林,杨春杰,董春法,肖新华. 热循环对9Ni钢接头粗晶热影响区显微组织和低温韧性的影响[J]. 机械工程材料, 2018, 42(8): 78～82
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