Heterogeneous quenching and partitioning from manganese-partitioned pearlite: retained austenite modification and formability improvement
Heterogeneous quenching and partitioning from manganese-partitioned pearlite: retained austenite modification and formability improvement
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锰配珠光体的非均相淬火和配分：残余奥氏体变质和成形性改善
DOI：
10.1016/j.actamat.2022.118060
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发表时间：
2022-05
期刊：
影响因子：
9.4
通讯作者：
Xingwang Cheng
中科院分区：
文献类型：
--
作者：
Chao Zhang;Zhiping Xiong;Dezhen Yang;Xingwang Cheng
传统的淬火配分工艺中，提高淬火温度通常会增加以块状为主的残余奥氏体（RA）的比例，这保证了良好的整体成形性，但降低了局部成形性。代替传统Q&P工艺中的均匀奥氏体，我们提出了一个Q&P工艺有针对性地基于Mn-异质奥氏体继承自Mn-分配珠光体。其中，源于铁素体片层的贫Mn奥氏体区域在淬火过程中容易转变为板条马氏体;同时，源于铁素体片层的富Mn奥氏体区域在室温下容易保留为膜RA。因此，这种异质Q&P过程不寻常地实现了由膜形态主导的大RA分数。大的RA分数确保了大的总伸长率，并且占主导地位的膜形态确保了大的均匀后伸长率，分别表明良好的全局和局部可成形性。此外，通过上述非均相奥氏体的分次转变，显微组织得到细化，主要有助于屈服强度增加200 - 300 MPa。在Q&P工艺中引入非均匀奥氏体提供了一种可行的方法，以实现大的RA分数占主导地位的膜形态，从而成功地生产高强度Q&P钢，同时具有良好的整体和局部成形性。
Increasing quenching temperature in conventional quenching and partitioning (Q&P) process usually increases the fraction of retained austenite (RA) being dominant by blocky morphology, which ensures a good global formability but deteriorates the local formability. Instead of homogeneous austenite in conventional Q&P process, we propose a Q&P process purposely based on Mn-heterogeneous austenite inherited from Mn-partitioned pearlite. Therein, Mn-depleted austenite areas originated from ferrite lamellae are readily transformed into lath martensite during quenching; meanwhile, Mn-enriched austenite areas originated from cementite lamellae are readily retained as film RA at room temperature. Consequently, this heterogeneous Q&P process unusually achieves a large RA fraction being dominant by film morphology. The large RA fraction ensures a large total elongation and the dominant film morphology ensures a large post-uniform elongation, indicating good global and local formability, respectively. Additionally, the microstructure is refined through the above divided transformation of heterogeneous austenite, predominantly contributing to the increased yield strength by 200 ∼ 300 MPa. Introducing heterogeneous austenite into Q&P process provides a feasible way to achieve a large RA fraction being dominant by film morphology, leading to the successful production of high-strength Q&P steels simultaneously with good global and local formability.
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DOI：
10.1016/j.msea.2021.141517
发表时间：
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期刊：
Materials Science and Engineering: A
影响因子：
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作者：
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影响因子：
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DOI：
--
发表时间：
1970-07
期刊：
--
影响因子：
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作者：
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DOI：
10.1007/s11661-018-4525-3
发表时间：
2018-02
期刊：
Metallurgical and Materials Transactions A
影响因子：
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