Iron-based alloy with high corrosion resistance and wear resistance

An iron-based alloy and alloy technology, which is applied in the field of alloys with high corrosion resistance and high wear resistance, can solve problems such as corrosion of cast iron brakes and reduced braking effect

Pending Publication Date: 2022-07-22
오를리콘메트코유에스아이엔씨
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The first factor is increased pressure from regulators to reduce fine particle emissions due to brake disc wear, and the second factor is the reduced use of friction braking in vehicles capable of regenerative braking, which has resulted in cast iron brakes Corrosion
Visible corrosion (rust) is an aesthetic issue, but may also reduce braking effectiveness

Method used

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  • Iron-based alloy with high corrosion resistance and wear resistance
  • Iron-based alloy with high corrosion resistance and wear resistance
  • Iron-based alloy with high corrosion resistance and wear resistance

Examples

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Embodiment Construction

[0017] By means of one or more of the various aspects, embodiments and / or specific features or sub-assemblies of the present disclosure, one or more of the advantages as specifically described above and pointed out below are intended.

[0018] thermodynamics

[0019] In example embodiments of the present disclosure, alloys may be adequately described by equilibrium or near-equilibrium thermodynamic parameters, such as figure 1 and 2 illustrated. One way to predict the corrosion performance of ferroalloys is to use PREN calculated according to the following equation (1):

[0020] PREN = Cr+3.3 * (Mo+0.5 * W)+16 * N (1),

[0021] The element value is expressed in weight percentage.

[0022] In single phase materials, such as most ferritic stainless steels, PREN is applied to the bulk alloy composition. However, because the alloys in the present disclosure can include multiple phases, the PREN value is calculated based on the equilibrium thermodynamic conditions of the matri...

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PUM

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Abstract

Example embodiments relate to alloys having high corrosion resistance and high wear resistance. Specifically, example embodiments relate to an iron-based alloy comprising: 20% to 50% by weight of Cr; from 0 wt% to 15 wt% Mo; 0% to 15% by weight of W; 3% to 6% by weight of B; and the balance of iron and impurities. In an example embodiment, a pitting resistance equivalent (PREN) of greater than 30 at 1300 K under substantially balanced setting conditions. In an example embodiment, the molar fraction of the hard phase of the alloy is between 45% and 80% at 1300 K under substantially balanced solidification conditions. The liquidus of the alloy may be less than 2000K under substantially balanced solidification conditions.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS [0002] This international application claims the benefit of US Provisional Application No. 62 / 949,761, filed December 18, 2019, the disclosure of which is expressly incorporated herein by reference in its entirety. technical field [0003] The present technology generally relates to alloys with high corrosion resistance and high wear resistance. Specifically, example embodiments relate to iron-based alloys for automotive disc brakes. Background technique [0004] Grey cast iron is currently the standard material for brake discs in many transportation options such as cars and trucks. It is a good choice due to its low cost, easy manufacturability through casting, and acceptable mechanical properties. However, grey cast iron has some problematic properties including low wear resistance leading to high material loss during operation and low corrosion resistance leading to corrosion during normal operation. Combined with regula...

Claims

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Application Information

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IPC IPC(8): C21D1/18C21D6/02C21D9/00
CPCC21D8/005C22C38/18C21D6/002C22C38/22C22C38/32C22C33/0285C23C4/08C23C30/00B22F9/082F16D69/00F16D66/028F16D2250/0046C23C4/067C23C4/12F16D65/127
Inventor C·J·艾布尔
Owner 오를리콘메트코유에스아이엔씨
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