Ti、V、Nb元素对DH36焊接热影响区显微组织的影响

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基金项目:

河北省自然科学基金-钢铁联合研究基金(E2014209144；E2015209207)；河北省高等学校科学技术研究项目(ZD2014012)

Effects of Ti,V and Nb on Microstructure of Welding Heat-affected Zone for DH36 Steel

1. College of Metallurgy & Energy, North China University of Science and Technology, Hebei Province Research Center of High Quality Steel Continuous Casting Engineering and Technology, Tangshan 063009, Hebei, China;
2. Tangshan Iron and Steel Company, Tangshan 063016, Hebei, China

摘要: 结合Ti、V、Nb元素对焊接热影响区微观组织的影响,添加不同微合金元素,进行实验室真空冶炼-轧制DH36高强船板钢。利用Gleeble3500试验机,针对加入不同微合金元素的DH36船板钢进行线能量为50 kJ/cm和100 kJ/cm的焊接热模拟试验,研究微合金元素V、Ti、Nb对焊接热影响区组织性能的影响。结果表明,在DH36焊接热影响区中,Ti生成了氧化物,该氧化物诱发了针状铁素体,钉扎了奥氏体晶界,而V、Nb并未生成夹杂物。
- DH36高强船板钢 /
- Ti /
- V /
- Nb /
- 焊接热影响区 /
- 夹杂物 /
- 针状铁素
Abstract: Vacuum smelting and rolling of DH36 high strength ship plate steel were carried out in laboratory by adding different micro-alloying elements.The effects of micro-alloying elements Ti,V and Nb on the microstructure of welding heat-affected zone for DH36 were investigated by welding thermal simulation tests respectively with 50 and 100 kJ/cm of line energy,using Gleeble 3500 testing machine.The results show that in the welding heat-affected zone of DH36,Ti transforms into oxides inducing acicular ferrite which pins the austenite grain boundaries,while V and Nb do not generate inclusions.
- DH36 high strength ship plate steel /
- Ti /
- V /
- Nb /
- welding heat-affected zone /
- inclusions /
- acicular ferrite