Effect of tempering temperature on plasma-welded joint of martensitic heat-resistant steel

IF 2.2 4区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Science and Technology Pub Date : 2023-02-27 DOI:10.1080/02670836.2023.2176623

Zhongke Zhang, W. Hu, Xufeng Liu

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Abstract

The effect of tempering temperature on microstructure and mechanical properties of plasma welded martensitic heat-resistant steel P92 was investigated by tempering heat treatment process (tempering temperature range was 550–750°C, temperature interval was 100°C). The results show that with the increase of tempering temperature, the microstructure of welded joint coarsens, the tensile strength and hardness decrease, and the toughness is improved.In the tempering process, M23C6 and Laves phases are produced in the welded joint. A certain amount of M23C6 precipitates can strengthen the mechanical properties of the welded joint. Excessive M23C6 carbides lead to the softening of martensite and the decrease of hardness; the formation of Laves phase can inhibit the excessive precipitation of M23C6, but the excessive precipitation of the Laves phase will lead to coarsening at the grain boundary and the formation of voids at the grain boundary. When the welded joint temperature is 650°C, the comprehensive mechanical properties of the welded joint are the best.

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回火温度对马氏体耐热钢等离子焊接接头的影响

采用回火热处理工艺(回火温度范围为550 ~ 750℃，温度区间为100℃)研究了回火温度对等离子体焊接马氏体耐热钢P92组织和力学性能的影响。结果表明:随着回火温度的升高，焊接接头组织变粗，抗拉强度和硬度降低，韧性提高;回火过程中，焊接接头中产生M23C6相和Laves相。一定量的M23C6析出物可以增强焊接接头的力学性能。过量的M23C6碳化物导致马氏体软化，硬度降低;Laves相的形成可以抑制M23C6的过度析出，但Laves相的过度析出会导致晶界粗化，晶界处形成孔洞。当焊接接头温度为650℃时，焊接接头的综合力学性能最佳。

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来源期刊

Materials Science and Technology 工程技术-材料科学：综合

CiteScore

2.70

自引率

5.60%

发文量

审稿时长

3 months

期刊介绍：《Materials Science and Technology》（MST） is an international forum for the publication of refereed contributions covering fundamental and technological aspects of materials science and engineering.