GB/T 32185-2015Titanium alloy large-sized bars (English PDF)

Foreword

This Standard was drafted as per the rules specified in GB/T 1.1-2009.

1 Scope

This Standard specifies the requirements, test methods, inspection rules, package, mark, transportation, storage, and purchasing order (contract) contents of the titanium alloy large-size bars.

This Standard is applicable to the hot-forging, hot-rolling methods generated titanium alloy large-size round bars (hereinafter refers to as bars).

2 Normative References

The following documents are essential to the application of this document. For the dated documents, only the versions with the dates indicated are applicable to this document; for the undated documents, only the latest version (including all the amendments) are applicable to this document.

GB/T 228.1 Metallic Materials - Tensile Testing - Part 1: Method of Test at Room Temperature

GB/T 2039-1997 Metallic Materials - Creep and Stress - Rupture Test in Tension

GB/T 3620.1 Designation and Composition of Titanium and Titanium Alloys

GB/T 3620.2 Titanium and Titanium Alloys - Permissible Variations of Chemical Composition for Wrought Product Analysis

GB/T 4338 Metallic Materials - Tensile Testing at Elevated Temperature

GB/T 4698 (all parts) Methods for Chemical Analysis of Titanium Sponge, Titanium and Titanium Alloys

GB/T 5168 Microstructure and Macrostructure Examination for alpha-beta Titanium Alloys

GB/T 5193 Method of Ultrasonic Inspection for Wrought Titanium and Titanium Alloy Products

GB/T 8180 Wrought Titanium and Titanium Alloy Products Packing, Marking, Transporting and Storing

GB/T 23605 Method for beta Transus Temperature Determination of Titanium Alloys

4 Test Methods

4.1 The arbitration analysis of chemical composition shall be performed as per GB/T 4698.

4.2 The tensile test at room temperature shall be performed as per GB/T 228.1. The tensile test at room temperature shall select R7 sample.

4.3 The tensile test at elevated temperature shall be performed as per GB/T 4338.

4.4 The endurance test shall be performed as per GB/T 2039-1997.

4.5 The size and shape shall be inspected by the measuring tool with corresponding precision.

4.6 The beta transition temperature test shall be performed as per GB/T 23605 or the differential thermal method.

4.7 The ultrasonic flaw detection shall be performed as per GB/T 5193.

4.8 The macrostructure and microstructure shall be inspected as per GB/T 5168.

4.9 The surface conditions shall be performed as per the standard block comparison method of surface roughness.

4.10 The appearance quality shall be visually inspected.

5 Inspection Rules

5.4.4 The test results of macrostructure shall be judged as per the following rules.

a) In the macrostructure test, if it is judged to be brittle segregation (its hardness is significantly higher than the segregation of the matrix; the common ones are like oxygen enriched segregation, nitrogen enriched segregation), such batch of bars are judged disqualified; if it is judged to be non-brittle segregation, the defects are allowed to removed, and then form new batch of bars and deliver.

b) If the macrostructure has cracks, nonmetallic inclusions, and shrinkage; the supplier is allowed to inspect piece by piece, remove the defects, and deliver the qualified bars.

c) In the macrostructure test, if there are suspension or controversy against whether belonging to the clear grains, it shall be subject to the microstructure test results. If the microstructure test is the two-phase region working structure, there is no completely original beta grain boundary, then the macrostructure is judged qualified, otherwise judged disqualified.

5.4.5 When microstructure is judged disqualified, such batch of bars shall be judged disqualified; however, the supplier is allowed to inspect piece by piece, and deliver the qualified ones.

6 Package, Mark, Transportation, Storage, and Quality Certificate