JPS6134154A - Wear resistant and high strength brass alloy - Google Patents

Abstract

PURPOSE:To obtain an inexpensive and high strength brass alloy having superior toughness and wear resistance by adding specified percentages of Nb, Fe and Ni to conventional Mn-Si brass. CONSTITUTION:A brass alloy having a composition consisting of, by weight, 50- 70% Cu, 0.5-5.0% Mn, 0.1-5.0% Al, 0.05-1.0% Fe, 0.01-1.0% Ni, 0.1-2.0% Si, 0.01-1.0% Nb and the balance Zn is prepd. A very hard and fine intermetallic compound is dispersed and precipitated in the alloy, and a brass alloy having superior wear resistance and mechanical properties is obtd. The machinability of the alloy can be improved by adding 0.1-2.0% Pb.

Description

[Detailed description of the invention] This invention requires a high strength brass alloy, particularly wear resistance.

Conventionally, wear-resistant brass alloys used under high speed and high loads have been made by adding Si to high strength brass to achieve high hardness.
S: So-called Mn-8 in which compounds such as 3 are precipitated
I-series brass is used. However, under sliding conditions, which are becoming more severe due to higher speeds, lower viscosity of lubricating oil, etc., the wear resistance is not sufficient for practical purposes, and even higher performance is desired.

The present invention was proposed in view of the above points, and aims to provide a copper alloy that is tougher and has better wear resistance than conventional high-strength brass at a low cost. %
, Mn 0.5-5.0%, AQo, 1-5.0%, F
e 0.05-1.0%, Ni 0.011.0%, S
i 0.1-2.0%, Nb 0001-1.0% and the balance Zn, and this alloy contains Pb 0
．． It is characterized in that it is added in an amount of 1 to 2.0%.

In other words, Nb, Fe', N
By adding i, ultra-hard fine intermetallic compounds are dispersed and precipitated, resulting in wear resistance and mechanical properties of 1+7K.
kJJ, cap Δ/1mu++ two (throat 1~+H=LMA
, 1hpl-DLt.

The gist is that cIi machinability was improved by adding an appropriate amount.

The reasons for selecting each of the above constituent elements and limiting them to the above proportions are as follows.

In other words, AQ is an element that promotes β-phase formation and increases the mechanical strength of the alloy, but if the amount added exceeds 5.0%, it tends to generate oxide slag (there is a risk that toughness will be impaired, If the amount is less than 0.1%, no toughening effect will be observed.

Mn combines with Nb and Si to form Mn-Si-N in addition to the Mn-Si compound found in conventional high-strength brass.
Since the b compound is precipitated, the appropriate range is 0.5 to 5.0% based on the ratio with the amount of Si and Nb, less than 0.5% has no effect, and 5.0% m element The number of birth rI1 generation will increase and this will harm creativity.

Fe is effective in refining grains and uniformly dispersing precipitates, but if the amount added exceeds 1.0%, the precipitates become coarse and agglomerated, resulting in the opposite effect. Below this, the above effects will not be observed.

N1 is added to strengthen the base, and if it is less than 0.01%, no effect is observed, and if it exceeds 1.0%, no significant improvement effect can be expected.

Si is an essential element because it generates intermetallic compounds unique to this alloy, and 0.1 to 4.0% is an appropriate range, and if it exceeds 2.0%, the alloy becomes brittle. 0.1
If it is less than %, the effect of the precipitate is small.

Like S1, Nb is an essential element for strengthening the formation of intermetallic compounds unique to this alloy, and a content of 0.01 to 1.0% gives good results depending on the ratio with S1 addition.

That is, when it is less than 0.01%, no effect is observed, and when it exceeds 1.0%, the effect is small in comparison to its addition, and it is also economically disadvantageous.

Pb maintains the excellent wear resistance of the above copper alloy, improves machinability, especially machinability, and increases the addition amount o, +~
2.0% is a good range. That is, while adding too much of the material lowers the toughness, if the amount of the material added is less than 0.1%, no effect of improving machinability is observed. Examples of the present invention will be described below.

Examples] Sample materials having the components shown in Table 1 were prepared, and an abrasion test was conducted by rubbing the inner diameter tapered surface of the ring manufactured using these materials with a taper hoon made of 5Cr42011 material. The results are shown in Table fjS2.

The test conditions were a surface pressure of 490kHz/Cm2. Sliding speed 5.4
m/see, cycle time 2se in gear oil,
Pushing was performed 1000 times at c (load 0.2 sec + no load 1.8 sec), and the axial displacement before and after the test was measured as the amount of wear.

As a result, the product of the present invention has significantly improved wear resistance compared to conventional materials.

Table 1 Table 2 Example 2 Sample materials with the components shown in Table 1 were subjected to a trowel tensile test and the results are shown in Table 3. As a result, all of the alloys of the present invention had better mechanical properties than the conventional alloys.Example 3 Figure 1 is a drawing showing the properties of chips generated when turning was performed on the table of the present invention. FIG. 2 is a diagram showing the properties of chips generated when the alloy 5 of the present invention was subjected to turning processing.

It is clear from Figure plS1 and Figure 2 that the chips of Inventive Alloy 5 are finely cut by the addition of PB, do not get entangled with the cutting tool, and have excellent machinability such as machinability. Recognize.

[Brief explanation of the drawing]

FIG. 1 and FIG. 2 are explanatory diagrams showing the properties of chips generated when Invention Alloys 1 and 5 were turned, respectively. Patent applicant Chuetsu Alloy Casting Co., Ltd. Figure 1 Figure 2

Claims (1)

[Claims] 1) Cu50-70%, Mn0.5-5.0 in weight proportion
%, Al0.1-5.0%, Fe0.05-1.0%,
Ni0.01-1.0%, Si0.1-2.0%, Nb
A wear-resistant, high-strength brass alloy comprising 0.01 to 1.0% and the balance of Zn. 2) Cu50-70%, Mn0.5-5.0 by weight
%, Al0.1-5.0%, Fe0.05-1.0%,
Ni0.01-1.0%, Si0.1-2.0%, Nb
A wear-resistant high-strength brass alloy comprising 0.01 to 1.0% Pb, 0.1 to 2.0% Pb, and the balance Zn.