MICROSTRUCTURE AND TENSILE PROPERTIES OF A RECENT INTER-CRITICALLY AUSTENITIZED QUENCHED AND PARTITIONED STEEL

IF 1.1 Q3 METALLURGY & METALLURGICAL ENGINEERING
Hoda Refaiy, Mai Fouad, Hoda Nasr El-Din, Eman H. El-shenawy
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Abstract

Quenched and partitioned steel is a promising grade of advanced high-strength steel "Third Generation" for industrial applications such as the automotive industry. This research aimed to develop a novel ultra-high-strength quenched and partitioned steel with good ductility from a novel alloy with the composition of 0.37C- 3.65Mn- 0.65Si- 0.87Al- 1.5Ni-0.05P, wt.% which is non-standard. This quenched and partitioned steel was developed by inter-critical austenitization followed by quenching to a temperature below Martensite start temperature (80 and 120 oC), then partitioning at 450 oC for different times (20, 40, 60, 100, 140, and 180 s). Scanning electron microscope and X-Ray diffraction were utilized to investigate the microstructure and retained austenite characteristics. The tensile properties of developed Q&P specimens were also investigated. The results demonstrated that the specimen quenched at 120 oC and partitioned for 180s achieved a maximum strength elongation balance of 26 GPa.%. Both the specimens quenched at 80 and 120 oC displayed a decrease in strength values with extending holding time due to the tempering of primary martensite. Increasing partitioning time for the specimens quenched at 120 oC led to enhancing elongation, where a maximum total elongation of 19.7% was achieved for the partitioning time of 180s.  
一种新型临界间奥氏体淬火分区钢的组织和拉伸性能
淬火和分区钢是一种很有前途的高级高强度钢“第三代”,用于汽车工业等工业应用。本研究旨在由成分为0.37C-3.65Mn-0.65Si-0.87Al-1.5Ni-0.05P,wt.%的新型非标合金,开发出一种具有良好延展性的新型超高强度调质钢。这种淬火和分区钢是通过临界间奥氏体化,然后淬火到低于马氏体起始温度(80和120℃)的温度,然后在450℃下分区不同的时间(20、40、60、100、140和180 s)来开发的。利用扫描电子显微镜和X射线衍射仪对其显微组织和残余奥氏体特性进行了研究。还研究了开发的Q&P试样的拉伸性能。结果表明,在120℃下淬火并分配180 s的试样获得了26GPa.%的最大强度-伸长率平衡。由于初生马氏体的回火,在80和120℃下淬火的两个试样的强度值都随着保温时间的延长而降低。增加在120℃下淬火的试样的分配时间会提高伸长率,其中在180s的分配时间内,最大总伸长率达到19.7%。
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来源期刊
Acta Metallurgica Slovaca
Acta Metallurgica Slovaca METALLURGY & METALLURGICAL ENGINEERING-
CiteScore
2.00
自引率
30.00%
发文量
22
审稿时长
12 weeks
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