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固溶處理對(duì)低鎳雙相不銹鋼耐點(diǎn)蝕及強(qiáng)韌性能的影響
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1.中國(guó)兵器科學(xué)研究院寧波分院;2.浙江大學(xué) 材料科學(xué)與工程學(xué)院

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浙江省博士后擇優(yōu)資助(ZJ2020091), 寧波市自然科學(xué)基金(202003N4343), 寧波市科技創(chuàng)新2025重大專項(xiàng)(2020Z055)


Effect of Solid Solution Treatment on Pitting Corrosion and Strength-Toughness Properties of Low-Nickel Duplex Stainless Steel
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1.Ningbo Branch of Chinese Academy of Ordnance Science;2.School of Materials Science and Engineering,Zhejiang University

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    摘要:

    采用“C/N+Mn代Ni”的合金設(shè)計(jì)方法,制備出了一種具有良好熱加工性能的低鎳雙相不銹鋼21Cr-DSS,并研究了固溶處理工藝對(duì)新鋼種微觀組織、強(qiáng)韌性及耐點(diǎn)蝕性能的影響。結(jié)果表明：21Cr-DSS在熱軋過程中鐵素體比奧氏體更容易發(fā)生動(dòng)態(tài)軟化。固溶溫度比保溫時(shí)間對(duì)21Cr-DSS中兩相比例的影響更明顯,且奧氏體晶粒尺寸穩(wěn)定性優(yōu)于鐵素體。隨固溶溫度升高,21Cr-DSS的強(qiáng)韌性得到改善,但當(dāng)溫度超過1100°C后,強(qiáng)韌性下降。在1050°C固溶處理30min時(shí),21Cr-DSS具有最佳的綜合性能,此時(shí)強(qiáng)塑積為58.9GPa%,-40°C低溫沖擊功為84J,在3.5%氯化鈉溶液中的點(diǎn)蝕電位為0.43V。21Cr-DSS比常規(guī)LDX2101具有更優(yōu)異的熱加工性能和強(qiáng)韌性,且耐點(diǎn)蝕性能基本相當(dāng)。與AISI 304奧氏體不銹鋼相比,21Cr-DSS的強(qiáng)度和耐點(diǎn)蝕性能明顯更優(yōu)。

    Abstract:

    A novel low-nickel duplex stainless steel of 21Cr-DSS with excellent hot workability was prepared by the alloying design of "C/N+Mn instead of Ni", while the effects of solid solution treatment on its microstructure, strength-toughness and pitting corrosion resistance were studied. The ferrite of 21Cr-DSS during hot-rolling was more susceptible to dynamic softening than austenite. The effect of solid solution treatment temperature on the ferrite/austenite ratio in 21Cr-DSS was more obvious than that of holding time, and the stability of austenite grain size was better than that of ferrite. The strength and toughness of 21Cr-DSS were improved with an increase in solid solution temperature, but when the temperature exceeded 1100°C, its strength and toughness were decreased. The 21Cr-DSS solid solution treated at 1050 °C for 30min had the excellent comprehensive properties, with the PSE (product of strength and plasticity), -40°C impact energy and pitting potential in 3.5% sodium chloride solution having been measured to be about 58.9GPa%, 84J and 0.43V, respectively. The 21Cr-DSS has the more excellent hot workability and strength-toughness than LDX2101, and the similar pitting corrosion resistance. Compared with AISI 304 austenitic stainless steel, the 21Cr-DSS has the higher strength and pitting corrosion resistance.

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趙巖,王旭,陳達(dá)宇,高永亮,楊曉禹,陳巍.固溶處理對(duì)低鎳雙相不銹鋼耐點(diǎn)蝕及強(qiáng)韌性能的影響[J].稀有金屬材料與工程,2023,52(2):535~543.[Zhao Yan, Wang Xu, Chen Dayu, Gao Yongliang, Yang Xiaoyu, Chen Wei. Effect of Solid Solution Treatment on Pitting Corrosion and Strength-Toughness Properties of Low-Nickel Duplex Stainless Steel[J]. Rare Metal Materials and Engineering,2023,52(2):535~543.]
DOI：10.12442/j. issn.1002-185X.20211146

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歷史
  • 收稿日期:2021-12-26
  • 最后修改日期:2022-01-25
  • 錄用日期:2022-02-09
  • 在線發(fā)布日期: 2023-03-09
  • 出版日期: 2023-02-28