Effects of V–N Microalloying on Microstructure and Property in the Welding Heat Affected Zone of Constructional Steel
نویسندگان
چکیده
Shielded metal arc welding and thermal simulation experiment were carried out for constructional steel containing 0% V 0.10% V, the microstructure, precipitation feature, microhardness HV0.2, −20 °C impact value in heat affected zone (HAZ) investigated. The results showed that coarse-grained (CGHAZ), N completely dissolved matrix of to promote growth prior austenite grains, meanwhile fraction high angle grain boundaries (HAGBs) decreased, thereby leading mean decreases from 87 J 18 J. In refined (GRHAZ), V(C, N) precipitates experience re-dissolution re-precipitation at boundaries, V–N microalloying changes microstructure lath bainite + granular small amount polygonal ferrite pearlite martensite, 335 HV0.2 207 decreased 117 103 intercritical (ICHAZ), re-dissolution, re-precipitation, growth, causing formation micro-sized precipitates, 93 62
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ژورنال
عنوان ژورنال: Metals
سال: 2022
ISSN: ['2075-4701']
DOI: https://doi.org/10.3390/met12030480