The significant impact of introducing nanosize precipitates and decreased effective grain size on retention of high toughness of simulated heat affected zone (HAZ)

J. Wang; Y.F. Shen; W.Y. Xue; N. Jia; R.D.K. Misra

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The significant impact of introducing nanosize precipitates and decreased effective grain size on retention of high toughness of simulated heat affected zone (HAZ)

机译：引入纳米沉淀物和降低有效粒度的显着影响，以保留模拟热影响区的高韧性（HAZ）

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The study of toughening mechanism associated with the heat-affected zone (HAZ) continues to be of significant interest for improving the low temperature (-40 °C) toughness. In this study, the effect of different heat input on microstructure, hardness and low temperature impact toughness of coarse-grained HAZ (CGHAZ) in a high-strength low-alloy (HSLA) plate steel was explored by using welding thermal simulations. After different welding thermal cycles with heat input of 60, 90, 120, and 180 kJ cm~(-1), average effective grain size of 5.7, 5.9, 6.2, and 6.7 ± 0.2 μm, were respectively obtained. Although the effective grain size marginally increased with the increase of heat input, the values were remarkably smaller than the prior austenite grain size of 54, 93, 104, and 118 μm. Compared to the as-processed HSLA steel, impact toughness of steel welded with a heat input of 60 kJ cm~(-1) decreased dramatically from 318 ± 20 to 31 ± 8J·cm~(-2). But interestingly, impact toughness was increased to a peak value of 325 ± 20 J cm~(-2) when the heat input was increased to 180 kJ cm~(-1). Toughness was enhanced by grain refinement (D = 6.7 ± 0.2 μm) and through the nano-size precipitates (d = 10 nm), which were induced by medium heat input of 180 kJ cm~(-1). The values of precipitation strengthening were 203 MPa and .90 MPa while the critical stress values of crack propagation were 32 GPa and 10 GPa for the steels welded at 180 and 270 kJ cm~(-1), respectively. A critical analysis of fracture toughness and yield strength in terms of theoretical predictions is presented.

机译：与热影响区（HAZ）相关的增韧机制的研究仍然是改善低温（-40℃）韧性的重要感兴趣。在该研究中，通过使用焊接热模拟探索了在高强度低合金（HSLA）板钢中粗粒度Haz（CGHAZ）的微观结构，硬度和低温冲击韧性的不同热量的影响。在具有60,90,120和180kJ厘米〜（-1）的热量输入的不同焊接热循环后，分别获得平均有效粒度为5.7,5.9,6.2和6.7±0.2μm。尽管随着热输入的增加略微增加的有效粒度，但值比先前奥氏体粒径为54,93,104和118μm。与钢材的钢材相比，用60kJ厘米〜（-1）的热输入焊接的钢的冲击韧性从318±20到31±8j·cm〜（-2）显着降低。但是，有趣的是，当热量输入增加到180kJ厘米〜（-1）时，有趣的是，当热量增加到325±20JCm〜（-2）的峰值增加到325±20J厘米〜（-2）。通过晶粒细化（D = 6.7±0.2μm）和通过纳米大小沉淀物（D = 10nm）来增强韧性，其培养基热输入为180kJcm〜（-1）。沉淀强化的值分别为203MPa和.90MPa，而裂纹繁殖的临界应力值分别为在180和270kJ厘米〜（-1）焊接的钢的32GPa和10GPa。提出了对理论预测的裂缝韧性和屈服强度的关键分析。

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来源
《Materials Science and Engineering》 |2021年第28期|140484.1-140484.17|共17页
作者
J. Wang; Y.F. Shen; W.Y. Xue; N. Jia; R.D.K. Misra;
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Key Laboratory for Anisotropy and Texture of Materials School of Materials Science and Engineering Northeastern University Shenyang 110819 China;

The State Key Lab of Rolling & Automation Northeastern University Shenyang 110819 China;

The State Key Lab of Rolling & Automation Northeastern University Shenyang 110819 China;

Key Laboratory for Anisotropy and Texture of Materials School of Materials Science and Engineering Northeastern University Shenyang 110819 China;

Laboratory for Excellence in Advanced Steel Research University of Texas at El Paso TX 79968 USA;

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High-strength low-alloy (HSLA) steel; Welding; Heat input; Heat affected zone; Impact toughness;

机译：高强度低合金（HSLA）钢;焊接;热输入;热影响区;冲击韧性;

The significant impact of introducing nanosize precipitates and decreased effective grain size on retention of high toughness of simulated heat affected zone (HAZ)

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