热输入对09MnNiDR钢焊接热影响区粗晶区组织和韧性的影响
Effect of Heat Input on Microstructure and Toughness of Welding Coarse-Grained Heat Affected Zone of 09MnNiDR Steel
摘 要
采用Gleeble-3800型热模拟机对09MnNiDR钢进行热模拟试验以制备不同热输入下的焊接热影响区粗晶区（CGHAZ）试样，研究了热输入对试样显微组织、硬度和冲击韧性的影响。结果表明：随着热输入的增加，CGHAZ试样的显微组织从板条贝氏体+粒状贝氏体转变为粒状贝氏体+块状铁素体，硬度逐渐降低；不同热输入下CGHAZ试样的-70 ℃冲击吸收能量最高只有31 J，不满足技术要求，粒状贝氏体组织是导致韧性恶化的主要原因；随着热输入的增加，CGHAZ试样中原始奥氏体晶粒尺寸先减小后增大，导致试样-70 ℃冲击吸收能量先增大后减小。
热影响区粗晶区
显微组织
原始奥氏体晶粒
冲击韧性
welding heat input
coarse-grained heat affected zone
microstructure
prior austenite grain
impact toughness
Abstract
Thermal simulation tests were conducted on 09MnNiDR steel to prepare welding coarse-grained heat affected zone (CGHAZ)samples at different heat inputs by using a Gleeble-3800 thermal simulator.The effect of the heat input on microstructures, hardnesses and impact toughness of the samples was studied.The resutls show that with increasing heat input, the microstructure of the CGHAZ sample changed from lath bainite+granular bainite to granular bainite+massive ferrite, and the hardness decreased.The maximum impact absorbed energy at -70 ℃ of CGHAZ samples at different heat inputs was only 31 J, which did not meet the requirements; the granular bainite structure was the main reason for the deterioration of toughness.With increasing heat input, the grain size of prior austenite in CGHAZ samples decreased and then increased.Therefore, the impact absorbed energy at -70 ℃ of the samples increased and then decreased.
中图分类号 TG407 DOI 10.11973/jxgccl202112013
所属栏目 物理模拟与数值模拟
基金项目 国家自然科学基金资助项目（51761027，51675255）；兰州市科技计划项目（2019-1-49）
收稿日期 2020/9/28
修改稿日期 2021/11/25
网络出版日期
作者单位点击查看
备注李金梅(1986-)，女，甘肃兰州人，工程师，硕士
引用该论文: LI Jinmei,YANG Zhaoqing,LIANG Xiaowu,ZHANG Jianxiao,LEI Wanqing,CAO Rui. Effect of Heat Input on Microstructure and Toughness of Welding Coarse-Grained Heat Affected Zone of 09MnNiDR Steel[J]. Materials for mechancial engineering, 2021, 45(12): 72～77
李金梅,杨兆庆,梁小武,张建晓,雷万庆,曹睿. 热输入对09MnNiDR钢焊接热影响区粗晶区组织和韧性的影响[J]. 机械工程材料, 2021, 45(12): 72～77
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【7】KUMAR S,NATH S K.Effect of heat input on impact toughness in transition temperature region of weld CGHAZ of a HY 85 steel[J].Journal of Materials Processing Technology,2016,236:216-224.
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