CN102352473A - Heat treatment process of ZL116 alloy castings - Google Patents

Abstract

The invention relates to a heat treatment process of ZL116 alloy castings. The heat treatment process is characterized by comprising the following steps: 1) checking, namely checking whether the batch numbers of a casting furnace and a sample furnace are same or not and cleaning coked crystals and greasy dirts on the castings; 2) charging, namely placing the castings at the center of the furnace below 300 DEG C and leaving gaps between the castings; 3) quenching, namely heating to 535+/-5 DEG C, keeping the temperature for 16 hours and soaking the castings in 20-40 DEG C of water, wherein the transfer time is no more than 15s and the soaking time is no less than 2 minutes; and 4) performing aging treatment, namely heating to 175+/-5 DEG C, keeping the temperature for 8 hours and performing air cooling. By adopting the heat treatment process, the strength of the ZL116 alloy castings can be increased, the elongation rate can be improved; and the comprehensive mechanical performance is better and more stable, the performance indexes of the technical requirements can be met and the residual stress of heat treatment can be eliminated better.

Description

ZL116 alloy-steel casting thermal treatment process

Technical field

The present invention relates to a kind of ZL116 alloy-steel casting thermal treatment process, be used for the ZL116 alloy is heat-treated, to improve the mechanical property of foundry goods, to satisfy the quality product requirement.

Background technology

The ZL116 alloy is mainly used in the complex structure of long term operation below 200 ℃, load bearing element and the demanding part of resistance to air loss that wall is thin, as: stick, support arm, Y-tube, housing etc.ZL116 foundry goods alloying constituent more complicated, the kind of alloying element and quantity are more relatively.This alloy-steel casting profile variation and cross-sectional shape size are diversified.Unrelieved stress was bigger after this alloy-steel casting quenched, and the unsettled phenomenon of mechanical property occurred, therefore, in order to eliminate the internal stress of foundry goods, improved the stability of mechanical property, was badly in need of researching and solving the influence of thermal treatment process to its cast properties.

Summary of the invention

The technical problem that the present invention will solve provides a kind of ZL116 alloy-steel casting thermal treatment process; This thermal treatment process improves ZL116 alloy-steel casting intensity; Unit elongation also is improved simultaneously; Comprehensive mechanical performance is better and friendship is stable, has reached the performance index of technical requirements, and has eliminated heat treated unrelieved stress preferably.

For overcoming the above problems, concrete technical scheme of the present invention is following: a kind of ZL116 alloy-steel casting thermal treatment process is characterized in that may further comprise the steps:

1) inspection: whether inspection foundry goods stove lot number identical with the assay furnace lot number, on the foundry goods water crystalline substance, greasy dirt should be removed totally;

2) shove charge: foundry goods should be in shove charge below 300 ℃, and is placed on the center of stove, and leaves the gap between each foundry goods;

3) quench: temperature rises to 535 ℃ ± 5 ℃, be incubated 16 hours, and in the water with 20 ~ 40 ℃ of foundry goods immersions, be no more than 15s its transfer time then, and in water the immersion time more than or equal to 2 minutes;

4) ageing treatment: temperature rises to 175 ± 5 ℃, is incubated 8 hours, air cooling.

Adopt this ZL116 alloy-steel casting thermal treatment process, improved analysis ability, improved the qualification rate of foundry goods mechanical property, reduce repetition thermal treatment, greatly reduce cost, guarantee the quality of foundry goods simultaneously the aluminum alloy heat treatment process.

Embodiment

Embodiment one:

A kind of ZL116 alloy-steel casting thermal treatment process may further comprise the steps:

1) inspection: whether inspection foundry goods stove lot number identical with the assay furnace lot number, on the foundry goods water crystalline substance, greasy dirt should be removed totally;

2) shove charge: foundry goods should be in shove charge below 300 ℃, and is placed on the center of stove, and leaves the gap between each foundry goods;

3) quench: temperature rises to 530 ℃, be incubated 16 hours, then in the water with 40 ℃ of foundry goods immersions, its transfer time 10s, and in water 3 minutes immersion time;

4) ageing treatment: temperature rises to 170 ℃, is incubated 8 hours, air cooling.

Embodiment two

A kind of ZL116 alloy-steel casting thermal treatment process may further comprise the steps:

1) inspection: whether inspection foundry goods stove lot number identical with the assay furnace lot number, on the foundry goods water crystalline substance, greasy dirt should be removed totally;

2) shove charge: foundry goods should be in shove charge below 300 ℃, and is placed on the center of stove, and leaves the gap between each foundry goods;

3) quench: temperature rises to 540 ± 5 ℃, be incubated 16 hours, and in the water with 30 ℃ of foundry goods immersions, be no more than 6s its transfer time then, and in water 5 minutes immersion time;

4) ageing treatment: temperature rises to 180 ℃, is incubated 8 hours, air cooling.

Through the foregoing description checking, its tensile strength sigma _b>=300, unit elongation δ>=2, qualified hardness.

Claims (1)

1. ZL116 alloy-steel casting thermal treatment process is characterized in that may further comprise the steps:

1) inspection: whether inspection foundry goods stove lot number identical with the assay furnace lot number, on the foundry goods water crystalline substance, greasy dirt should be removed totally;

2) shove charge: foundry goods should be in shove charge below 300 ℃, and is placed on the center of stove, and leaves the gap between each foundry goods;

3) quench: temperature rises to 535 ℃ ± 5 ℃, be incubated 16 hours, and in the water with 20 ~ 40 ℃ of foundry goods immersions, be no more than 15s its transfer time then, and in water the immersion time more than or equal to 2 minutes;

4) ageing treatment: temperature rises to 175 ± 5 ℃, is incubated 8 hours, air cooling.