高溫時(shí)效對(duì)S31042鋼線性摩擦焊接頭組織和性能的影響

高溫時(shí)效對(duì)S31042鋼線性摩擦焊接頭組織和性能的影響Effect of High-temperature Aging on Microstructure and Mechanical Properties of Linear Friction Welded S31042 Steel Joint

以使用線性摩擦焊工藝連接的S31042鋼接頭為研究對(duì)象，在700 ℃下對(duì)其進(jìn)行長(zhǎng)期時(shí)效和力學(xué)性能測(cè)試。通過OM、SEM、TEM和拉伸實(shí)驗(yàn)研究高溫時(shí)效對(duì)S31042鋼線性摩擦焊接頭組織和性能的影響。結(jié)果表明，在700 ℃長(zhǎng)期時(shí)效過程中，線性摩擦焊中形成的再結(jié)晶晶粒和納米級(jí)NbCrN相的穩(wěn)定性較好，細(xì)晶強(qiáng)化和析出強(qiáng)化的綜合作用使接頭保持優(yōu)異的高溫性能。而焊縫區(qū)、熱力影響區(qū)及熱影響區(qū)中不同類型的M23C6相在時(shí)效過程中均發(fā)生粗化。在時(shí)效500 h樣品的熱力影響區(qū)中初次觀察到σ相，隨著時(shí)效時(shí)間的延長(zhǎng)，σ相的析出數(shù)量增加且尺寸增大，導(dǎo)致摩擦焊接頭的高溫力學(xué)性能急劇降低。

S31042 steels with 25 wt.% Cr and 20 wt.% Ni have been served as super-heaters and re-heaters in ultra-super critical (USC) plants, owing to their outstanding corrosion resistance and creep rupture strength. Although the S31042 steels have been joined successfully by linear friction welding, the reliability of joints at high temperature should still be paid more attention. Microstructure characteristics and mechanical properties of linear friction welded S31042 steel joint subjected to aging treatment were investigated by OM, SEM, TEM, and mechanical test at 700 oC. The recrystallized grains and nanoscale NbCrN particles have been stable during the high-temperature aging, and the joint exhibited excellent performance due to the grain refinement strengthening and precipitation strengthening. The average size of M23C6 phase in weld zone, thermo-mechanically affected zone and heat affected zone increased with the aging time. After aging treatment at 700 oC for 500 h, σ-phase precipitated at boundary junctions in thermo-mechanically affected zone. The average size of the σ-phase increased with the aging time, as well as the volume fraction of the σ-phase. With the formation of σ-phase, the fracture site of joints shifted from the parent material to the areas adjacent to the weld zone, and the high-temperature mechanical properties of joints were sharply decreased.

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