Abstract

This specification covers the requirements for automated, controlled shot peening of metallic articles prior to electrolytic or autocatalytic deposition of nickel or chromium, or as a final finish, using shot made of cast steel, conditioned cut wire, or ceramic media. The process is applicable to those materials on which test work has shown it to be beneficial within given intensity ranges. It is not suitable for brittle materials. Hand peening and rotary flap peening are excluded specifically. Shot peening induces residual compressive stresses in the surface and near-surface layers of metallic articles, controlling or limiting the reduction in fatigue properties that occurs from nickel or chromium plating of the article, or the fatigue properties of unplated articles. It is a process for cold working surfaces by bombarding the product with shot of a solid and spherical nature propelled at a relatively high velocity. Cast steel, cut wire, and ceramic shot shall all be spherical in shape and shall all be free of sharp edges, corners, and broken pieces. Prior to shot peening, the following operations shall be done first: heat treatment, machining, grinding, flaw test, crack test, corrosion detection, cleaning, and masking. Peened surfaces shall be uniform in appearance and completely dented so that the original surface is obliterated entirely. After shot peening, the following methods shall be done: residual shot removal, surface finishing, chemical cleaning of nonferrous metals and their alloys, thermal and heat treatments, and corrosion protection.

This abstract is a brief summary of the referenced standard. It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application. ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date.

Significance and Use

Shot peening is a process for cold working surfaces by bombarding the product with shot of a solid and spherical nature propelled at a relatively high velocity. In general, shot peening will increase the fatigue life of a product that is subject to bending or torsional stress. It will improve resistance to stress corrosion cracking. It can be used to form parts or correct their shapes. See Appendix X1 for additional information.

It is essential that the shot peening process parameters be controlled rigidly to ensure repeatability from part to part and lot to lot.

This specification covers techniques and methods necessary for proper control of the shot peening process.

1. Scope

1.1 This specification covers the requirements for automated, controlled shot peening of metallic articles prior to electrolytic or autocatalytic deposition of nickel or chromium, or as a final finish, using shot made of cast steel, conditioned cut wire, or ceramic media. The process is applicable to those materials on which test work has shown it to be beneficial within given intensity ranges. It is not suitable for brittle materials. Hand peening and rotary flap peening are excluded specifically.

1.2 Shot peening induces residual compressive stresses in the surface and near-surface layers of metallic articles, controlling or limiting the reduction in fatigue properties that occurs from nickel or chromium plating of the article, or the fatigue properties of unplated articles.

1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.

1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

ASTM Standards

B183 Practice for Preparation of Low-Carbon Steel for Electroplating

B242 Guide for Preparation of High-Carbon Steel for Electroplating

B320 Practice for Preparation of Iron Castings for Electroplating

B322 Guide for Cleaning Metals Prior to Electroplating

B607 Specification for Autocatalytic Nickel Boron Coatings for Engineering Use

B650 Specification for Electrodeposited Engineering Chromium Coatings on Ferrous Substrates

B656 Guide for Autocatalytic (Electroless) Nickel-Phosphorus Deposition on Metals for Engineering Use (Discontinued 2000)

B689 Specification for Electroplated Engineering Nickel Coatings

B733 Specification for Autocatalytic (Electroless) Nickel-Phosphorus Coatings on Metal

E11 Specification for Woven Wire Test Sieve Cloth and Test Sieves

E165 Practice for Liquid Penetrant Examination for General Industry

E709 Guide for Magnetic Particle Testing

Federal Standards

Military Standards

SAE Standards

Keywords

peening; shot; shot peening; Autocatalytic coatings--specifications; Automated controlled shot peening; Cast steel shot; Chromium electroplating; Electroplated Ni coatings--specifications; Metallic coatings--specifications; Paintball sports; Peening; Shot peening ;

ICS Code

ICS Number Code 25.220.40 (Metallic coatings)

DOI: 10.1520/B0851-04R09

ASTM International is a member of CrossRef.

ASTM B851