热输入对AISI 316L钢和API X70高强度低合金钢异种接头组织和力学性能的影响

IF 3.1 2区 材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING
Ebrahim Mortazavi, Reza Amini Najafabadi, Amirhossein Meysami
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引用次数: 10

摘要

研究了AISI 316L奥氏体不锈钢和API X70高强度低合金钢异种接头的组织和力学性能。为此,使用了三种不同的热输入,包括0.73,0。84和0。97 kJ /毫米。利用光学显微镜和扫描电镜对基体金属、焊缝金属、热影响区和界面等不同区域的显微组织进行了研究。通过显微硬度、拉伸试验和冲击试验测定了材料的力学性能。结果表明,随着热输入的增加,焊缝中枝晶尺寸增大,枝晶间距增大。同时,焊缝金属中δ铁素体的含量也有所降低。因此,降低了拉伸强度和硬度,增加了冲击试验能量。对AISI 316L母材与ER316L钎料界面的研究表明,热输入的增加使熔合界的奥氏体晶粒尺寸增大。在API X70钢与填充金属的界面处形成过渡区。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Effect of heat input on microstructure and mechanical properties of dissimilar joints of AISI 316L steel and API X70 high-strength low-alloy steel

The microstructure and mechanical properties of dissimilar joints of AISI 316L austenitic stainless steel and API X70 high-strength low-alloy steel were investigated. For this purpose, gas tungsten arc welding (GTAW) was used in three different heat inputs, including 0.73, 0. 84, and 0. 97 kJ/mm. The microstructural investigations of different zones including base metals, weld metal, heat-affected zones and interfaces were performed by optical microscopy and scanning electron microscopy. The mechanical properties were measured by microhardness, tensile and impact tests. It was found that with increasing heat input, the dendrite size and inter-dendritic spacing in the weld metal increased. Also, the amount of delta ferrite in the weld metal was reduced. Therefore, tensile strength and hardness were reduced and impact test energy was increased. The investigation of the interface between AISI 316L base metal and ER316L filler metal showed that increasing the heat input increases the size of austenite grains in the fusion boundary. A transition region was formed at the interface between API X70 steel and filler metals.

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来源期刊
CiteScore
4.30
自引率
0.00%
发文量
2879
审稿时长
3.0 months
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