Effect of postweld heat treatment on microstructure and mechanical properties of P92 steel welded joint

DING Guangzhu; GUO Weiyun; SUN Songtao; LI Shihui; HU Chuanhua; LI Hongwu; LI Bao; WANG Shunxing

doi:10.7512/j.issn.1001-2303.2020.10.09

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Effect of postweld heat treatment on microstructure and mechanical properties of P92 steel welded joint
Vol. 50, Issue 10, Pages: 44-49(2020)
Published：2020
DOI： 10.7512/j.issn.1001-2303.2020.10.09
稿件说明：

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DOI：

DING Guangzhu, GUO Weiyun, SUN Songtao, et al. Effect of postweld heat treatment on microstructure and mechanical properties of P92 steel welded joint[J]. Eletric Welding Machine2020, 50(10): 44-49. DOI： 10.7512/j.issn.1001-2303.2020.10.09.

摘要

通过试验研究了不同热处理方式下P92钢焊接接头的组织性能变化。结果表明:所有试样的拉伸断口均位于非焊缝区

焊缝处的拉伸性能好于母材区域。在低于700℃温度下保温60 min后

焊缝硬度高于母材

焊缝硬度值在35～45 HRC

母材硬度约为20 HRC

对焊缝区硬度无改善;760℃保温90 min焊后热处理后焊缝组织接近原始母材组织

为回火屈氏体

组织均匀细小

焊接硬度明显下降且接近母材

为最佳焊后热处理工艺。

Abstract

The weld

heat affected zone and microstructure and properties of P92 steel under different heat treatment were studied. The results show that the tensile fractures of all the specimens are located in the non-weld zone

and the tensile properties at the weld are better than those in the parent metal zone.After the sample being kept warm below 700 ℃ for 60 min

the hardness of the weld is higher than t hat of the parent metal

where the hardness of the weld is between 35～45 HRC and the hardness of the parent metal is around 20 HRC. This postweld heat treatment does not improve the hardness of the weld zone.After the postweld heat treatment with heat preservation at 760 ℃for 90 min

the weld microstructure is close to the original parent material micro-structure

which is tempered tortoise

the microstructure is uniform and small

the hardness of weld microstructure decreases and is close to that of the base metal

which is the best postweld heat treatment process in the test.