Effect of the Small Reaustenized Grains on the Mechanical Properties of a HSLA Steel
Grain refinement improves not only strength but also toughness. Small reaustenized grains were discovered to form along the grain boundaries and lath boundaries in an as rolled high-strength low-alloy (HSLA) steel when heated to double phase region.The number and size of the small reaustenized grains were revealed to depend mainly on temperature in the range of 700 to760℃.These small reaustenized grains were deduced to form by consuming precipitates. The mechanical property tests showed that they resulted in slight changes to tensile properties. However, the sample heated at 740℃ produced a peak Charpy V-notch (CVN) impact energy of 248J when tested at -30℃. Fractography showed that the facture surface of the 740℃ heated impact sample exhibited the smallest brittle zone away from the notch root and a large dimple zone lay ahead of the notch tip, which demonstrated the highest toughness.
high-strength low-alloy steel reaustenization grain refinement tensile property
Lian-yu Zhao Wei Yan Yi-yin Shana Ke Yang
Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016;Graduate School of Chinese Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016
国际会议
The 6th International Conference on High Strength Low Alloy Steels(第六届高强度低合金钢国际会议HSLA Steels2011)
北京
英文
659-663
2011-05-31（万方平台首次上网日期，不代表论文的发表时间）