亞穩(wěn)奧氏體調(diào)控對低溫海工用鋼力學(xué)性能的影響與機(jī)理研究
發(fā)布人：上海艾荔艾合金股份有限公司www.shailiai.cn
更新時間：2016-01-19
利用 EBSD, HRTEM 與熱膨脹儀等實(shí)驗(yàn)手段對低碳中錳鋼在淬火+回火 (QT) 與淬火+片狀淬火+回火 (QLT) 工藝下的奧氏體形貌與相變過程進(jìn)行了對比分析.
亞穩(wěn)奧氏體調(diào)控對低溫海工用鋼力學(xué)性能的影響與機(jī)理研究EFFECT OF METASTABLE AUSTENITE ON MECHANICAL PROPERTY AND?MECHANISM IN CRYOGENIC STEEL APPLIED IN OCEANEERING利用 EBSD, HRTEM 與熱膨脹儀等實(shí)驗(yàn)手段對低碳中錳鋼在淬火+回火 (QT) 與淬火+片狀淬火+回火 (QLT) 工藝下的奧氏體形貌與相變過程進(jìn)行了對比分析. 結(jié)果表明, QT 與 QLT 工藝下所生成的回轉(zhuǎn)奧氏體形貌、尺寸、位置以及由此導(dǎo)致的奧氏體穩(wěn)定性差異是造成實(shí)驗(yàn)鋼力學(xué)性能特別是低溫沖擊韌性巨大差異的最主要原因. 熱力學(xué)與動力學(xué)分析表明, 由于 QLT 工藝在淬火+片狀淬火 (QL) 階段完成了 C和 Mn 元素的第一次配分,?因而相比于 QT 熱處理工藝, QLT 工藝下回轉(zhuǎn)奧氏體在生成速率顯著提高的同時其生長模型也由一維雙向增厚模式演變成一維單向增厚模式.?
With the development of marine resources and its emerging markets, the marine equipments such as?offshore drilling platform, subsea oil and gas transportation pipeline, and storage equipment of oil and gas are?developing actively. It is urgent to develop a new type of steel with low cost and excellent toughness to satisfy the?demand of marine equipment. In this work, the morphology of austenite and phase transition process in medium?manganese steel during quenching and tempering (QT) and quenching, lamellarizing and tempering (QLT) heat?treatments were investigated by using EBSD, HRTEM and thermal dilatometer. The results show that the?discrepancy of stability in austenite caused by its shape, size and location leads to the more excellent toughness?during QLT heat treatment compared to QT. It has been found from thermodynamical and dynamical viewpoint?that the formation rates of reverted austenite during QLT heat treatment are significantly larger relative to QT due?to the partition process of C and Mn elements in the lamellarizing stage. Moreover, two growth models of?film-type reverted austenite are distinct during two heat treatments: the unidimensional two-sided growth mode?during QT and unidimensional one-sided growth mode?during QLT.?
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