Alternative TitleEffect of tempering on microstructure and mechanical properties of welded joint by electron beam welding for Fe-Cr-Ni-Mo high-strength steel
胡小锋; 赵明久; 姜海昌; 闫德胜; 戎利建
Source Publication金属热处理
Abstract对Fe-Cr-Ni-Mo高强钢进行电子束焊接,并对焊接接头进行不同温度回火处理,利用OM、SEM和TEM等研究了回火对焊接接头组织和力学性能的影响。结果表明,焊态下焊缝金属组织为较粗大的板条马氏体,而热影响区则由较细的马氏体和少量的碳化物组成。高温回火后,在焊缝和热影响区均析出了大量的碳化物。硬度测试结果表明,焊态下焊缝金属和热影响区的硬度相当(分别为560 HV0.5和530 HV0.5),回火处理后硬度显著下降,但仍高于母材(415 HV0.5)。力学性能测试结果表明,焊接接头拉伸试样断裂位置均在母材,焊态下的焊缝冲击吸收能较差,为48 J;回火处理后焊缝金属的冲击吸收能显著提高,如600℃处理后焊缝金属的冲击吸收能为94 J。
Other AbstractElectron beam( EB) welding was applied to a Fe-Cr-Ni-Mo high-strength steel. Effect of tempering temperature on the microstructure and mechanical properties of welded joint was investigated by means of OM,SEM and TEM. The results show that the welded metal( WM) consists of coarse lath martensite and there are finer martensite and a small amount of carbides in the heat affected zone(HAZ). After high temperature tempering,large amounts of carbides precipitate in both WM and HAZ. Hardness tests show that the hardness of WM and HAZ are 560 HV0. 5 and 530 HV0. 5 respectively and tempering significantly lowers the hardness of the WM and HAZ,which is slightly higher than that of the base metal(415 HV0. 5). Therefore,all the tensile samples of welded joint are broken in the base metal. The impact tests show that the impact absorbed energy of WM and tempered WM at 600 ℃ are 48 J and 94 J respectively,which indicates that tempering can significantly improve the toughness of WM.
Keyword高强钢 电子束焊接 回火 高强高韧 焊接接头
Indexed ByCSCD
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Document Type期刊论文
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GB/T 7714
胡小锋,赵明久,姜海昌,等. 回火对Fe-Cr-Ni-Mo高强钢电子束焊接接头组织和力学性能的影响[J]. 金属热处理,2018,43.0(007):89-94.
APA 胡小锋,赵明久,姜海昌,闫德胜,&戎利建.(2018).回火对Fe-Cr-Ni-Mo高强钢电子束焊接接头组织和力学性能的影响.金属热处理,43.0(007),89-94.
MLA 胡小锋,et al."回火对Fe-Cr-Ni-Mo高强钢电子束焊接接头组织和力学性能的影响".金属热处理 43.0.007(2018):89-94.
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