Effect of Heat Input on Microstructure and Toughness of Welding Coarse-Grained Heat Affected Zone of 09MnNiDR Steel
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摘要: 采用Gleeble-3800型热模拟机对09MnNiDR钢进行热模拟试验以制备不同热输入下的焊接热影响区粗晶区（CGHAZ）试样，研究了热输入对试样显微组织、硬度和冲击韧性的影响。结果表明：随着热输入的增加，CGHAZ试样的显微组织从板条贝氏体+粒状贝氏体转变为粒状贝氏体+块状铁素体，硬度逐渐降低；不同热输入下CGHAZ试样的-70 ℃冲击吸收能量最高只有31 J，不满足技术要求，粒状贝氏体组织是导致韧性恶化的主要原因；随着热输入的增加，CGHAZ试样中原始奥氏体晶粒尺寸先减小后增大，导致试样-70 ℃冲击吸收能量先增大后减小。Abstract: Thermal simulation tests were conducted on 09MnNiDR steel to prepare welding coarse-grained heat affected zone (CGHAZ)samples at different heat inputs by using a Gleeble-3800 thermal simulator.The effect of the heat input on microstructures, hardnesses and impact toughness of the samples was studied.The resutls show that with increasing heat input, the microstructure of the CGHAZ sample changed from lath bainite+granular bainite to granular bainite+massive ferrite, and the hardness decreased.The maximum impact absorbed energy at -70 ℃ of CGHAZ samples at different heat inputs was only 31 J, which did not meet the requirements; the granular bainite structure was the main reason for the deterioration of toughness.With increasing heat input, the grain size of prior austenite in CGHAZ samples decreased and then increased.Therefore, the impact absorbed energy at -70 ℃ of the samples increased and then decreased.
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