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Effect of M-A constituents formed in thermo-mechanical controlled process on toughness of 20CrNi2MoV steel

Journal of Iron and Steel Research International 2019年第12期26卷 1340-1349页

作者： Bin-zhou Li Chang-sheng Li Xin Jin Jian Zhang State Key Laboratory of Rolling Technology and Automation Northeastern UniversityShenyang 110819LiaoningChina Ansteel Beijing Research Institute Beijing 102211China

The effect of martensite–austenite(M–A)constituents formed in thermo-mechanical controlled process on impact toughness of 20CrNi2MoV steel was *** variation in fraction,size and morphology of M–A constituent and its effect on toughness under different cooling rates were carried *** result shows that there was no significant change in the fraction of M–A constituent under different cooling rates,but the distribution and size of M–A constituent were greatly influenced by cooling rate,which consequently influenced *** amount of large blocky M–A constituents decreased from 4.7%to 1.7%,while that of elongated M–A constituents increased from 3.8%to 8.6%with the cooling rate increasing from 7 to 26°C/s,and the corresponding impact energy decreased from 132 to 84 *** deterioration of impact toughness could be related to the increase in the elongated M–A *** elongated M–A constituents existing along the prior austenite grain boundaries in samples of 26°C/s could easily lead to the formation of cleavage crack,which then results in the lower crack initiation energy than that of low cooling rate samples.

关键词： 20CrNi2MoV steel Martensite–austenite constituent thermo-mechanical controlled process Continuous cooling process Impact toughness

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Experimental study on 830 MPa grade pipeline steel containing chromium

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International Journal of Minerals,Metallurgy and Materials 2009年第3期16卷 273-277页

作者： Yi Ren Shuai Zhang Shuang Wang Wen-yue Liu Technical Center Anshan Iron ＆ Steel Co. Ltd. Ar shan 114009 China

The diversity of microstructure and properties of 830 MPa grade pipeline steel containing chromium was investigated by optical microscope and transmission electron microscopy. The main microstructures were multiple configurations, containing lath bainite and granule bainitc. mechanical properties test results showed that the yield strength and tensile strength improved with increasing chromium content. The toughness and elongation decreased at the same time, so temper process was introduced. Appling proper temper parameters, the values of toughness and elongation were improved dramatically, and the strength decreased slightly.

关键词： chromium high strength pipeline steel thermo-mechanical controlled process

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