Improving Pitting Corrosion Resistance at Inclusions and Ductility of a Martensitic Medium-Carbon Steel: Effectiveness of Short-Time Tempering

Improving Pitting Corrosion Resistance at Inclusions and Ductility of a Martensitic Medium-Carbon Steel: Effectiveness of Short-Time Tempering
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提高马氏体中碳钢夹杂物的抗点蚀能力和延展性:短时回火的有效性

DOI:
10.1149/2.0071811jes
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发表时间:
2018
影响因子:
3.9
通讯作者:
and Nobuyoshi Hara
and Nobuyoshi Hara
中科院分区:
工程技术4区
文献类型:
--
作者:
Mariko Kadowaki;Izumi Muto;Yu Sugawara; Takashi Doi;Kaori Kawano;and Nobuyoshi Hara

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研究了马氏体中碳钢(0.47质量% C)在平衡塑性和耐点蚀性方面的最佳回火条件。通过回火的淬火马氏体,其维氏硬度急剧下降,在0.1小时内,这表明延展性充分恢复的短时间回火。基于在含NaCl(pH 8.0)的硼-硼酸盐缓冲溶液中的微尺度极化的结果,在回火至少1 h的试样中,在非金属夹杂物处开始产生稳定的点蚀;然而,在0.1 h回火和淬火试样上没有产生稳定的点蚀。马氏体的短时回火被认为是一种可行的方法,以在促进耐点蚀性和实现马氏体碳钢的所需机械性能之间取得最佳平衡。
The optimal tempering conditions for a martensitic medium-carbon steel (0.47 mass% C) were investigated in terms of balancing ductility and pitting corrosion resistance. By tempering the as-quenched martensite, its Vickers hardness drastically decreased within 0.1 h, suggesting that ductility was sufficiently recovered by short-time tempering. Based on the results of micro-scale polarization in boric-borate buffer solutions with NaCl (pH 8.0), stable pits were initiated at non-metallic inclusions in the specimens tempered for at least 1 h; however, no stable pit was generated on the 0.1 h tempered and as-quenched specimens. Short-time tempering of martensite was suggested to be a feasible approach to striking an optimal balance between facilitating pitting corrosion resistance and achieving the desired mechanical properties of martensitic carbon steels.
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