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Influence of Two-Phase Region Heat Treatment on Cryogenic Toughness in 9Ni Steel

GUO Kui-wen, ZHU Jian, WANG Bing-xin

Abstract （577）

PDF （457KB）（386）

The effect of process parameters for intercritical heat treatment (IHT) on the microstructure and low-temperature toughness in 9Ni steel were investigated by means of SEM and XRD, etc. The experimental results show that intermediate quenching temperature and tempering temperature have obvious influence on cryogenic toughness. The higher or lower heat treatment temperature brings about the decrease in impact toughness. The reversed austenite distributes more dispersively and homogeneously, and much precipitates in specimens treated by IHT process compared with those treated by quenching and tempering process.

2010, 30 (2): 26-28. DOI: 10.3696/j.issn.1672-6952.2010.02.008

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Low-Temperature Toughness for Weld Joint of 400 MPa Ultrafine Grained Steel Strip

GUO Kui-wen, ZHU Jian, WANG Bing-xin

Abstract （459）

PDF （649KB）（178）

The 400 MPa ultrafine grained steel strip with thickness of 8 mm was connected by CO2+Ar arc welding under single-pass welding and double-pass welding, and the low-temperature toughness for weld joints was investigated by series impact test. The experimental results show that the low-temperature toughness for weld is worse among the weld joint. The low-temperature toughness for weld joint by double-pass welding is better than that of single-pass welding, and its heat affected zone(HAZ) is decreased because smaller heat input reduces grain growth coarsening.

2009, 29 (3): 48-51.