Welcome to Metal Improvement’s Phoenix, Arizona facility Web Site
Providing Shot Peening and Metal Treatment Services for the greater
Phoenix area and the Southwestern United States
Metal Improvement Company’s shot peening facilities draw on the combined engineering talent and experience of over 40 facilities in North America, Europe and Asia. Collectively, as business units of Curtiss-Wright Surface Technologies, they are the world’s largest provider of outsourced shot peening services. Individually, each facility takes pride in its ability to service the needs of its local market with fast turntimes, and an understanding of the requirements of a broad range of industry and OEM shot peening specifications.
Shot peening is a cold working process in which small spherical media called shot bombard the surface of a part. During the shot peening process, each piece of shot that strikes the material acts as a tiny peening hammer, imparting to the surface a small indentation or dimple. To create the dimple, the surface of the material must yield in tension. Below the surface, the material tries to restore its original shape, thereby producing below the dimple, a hemisphere of cold-worked material highly stressed in compression.
Nearly all fatigue and stress corrosion failures originate at the surface of a part, but cracks will not initiate or propagate in a compressively stressed zone. Because the overlapping dimples from shot peening create a uniform layer of compressive stress at metal surfaces, shot peening provides considerable increases in part life. Compressive stresses are beneficial in increasing resistance to fatigue failures, corrosion fatigue, stress corrosion cracking, hydrogen assisted cracking, fretting, galling and erosion caused by cavitation. The maximum compressive residual stress produced just below the surface of a part by shot peening is at least as great as one-half the yield strength of the material being shot peened.
In most modes of long-term failure, the common denominator is tensile stress. Tensile stresses attempt to stretch or pull the surface apart and may eventually lead to crack initiation. Because crack growth is slowed significantly in a compressive layer, increasing the depth of this layer increases crack resistance. Shot peening is the most economical and practical method of ensuring surface residual compressive stresses. For applications that require deeper residual compressive stresses than those provided by shot peening, Metal Improvement Company’s laser peening process imparts a layer of beneficial compressive stress that is four times deeper than that attainable from conventional shot peening treatments.
Shot peening also can induce the aerodynamic curvature in metallic wing skins used in advanced aircraft designs. Additional applications for shot peening include work hardening through cold work to improve wear characteristics, closing of porosity, improving resistance to intergranular corrosion, straightening of distorted parts, surface texturing and testing the bond strength of coatings.
Metal Improvement Company engineering specialists can help you best address the fatigue, forming and distortion correction challenges that manufacturers of fabricated metal parts face every day. Metal Improvement Company’s shot peening facilities employ the latest state-of-the-art processing capabilities for shot peening components of diverse shapes, sizes and materials under rigidly controlled conditions.
Metal Improvement facilities are capable of meeting most industry standard shot peening specifications, including: